Crown FM30 / FM150 / FM300 Owners Manual

FM30/FM150/FM300 Broadcast Transmitter User's Manual

Initial Release March 2007

All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language in any form by any means without the written permission of International Radio and Electronics, Inc. Printed in U.S.A.

Crown Broadcast attempts to provide information that is accurate, complete, and useful. Should you find inadequacies in the text, please send your comments to the following address: International Radio and Electronics Corporation P.O. Box 2000 Elkhart, Indiana, 46515-2000 U.S.A.

ii Contents Section 1– Getting Acquainted 1-1 1.1 Your Transmitter 1-2 1.2 Applications and Options 1-3 1.2.1 Stand Alone 1-4 1.2.2 Backup 1-4 1.2.3 Booster 1-4 1.2.4 Exciter 1-4 1.2.5 Translator 1-5 1.2.6 Satellator 1-6 1.2.7 Nearcasting 1-6 1.3 Transmitter/Exciter Specifications 1-7 1.4 Receiver Specifications 1-9 1.5 Safety Considerations 1-10 1.5.1 Dangers 1-10 1.5.2 Warnings 1-10 1.5.3 Cautions 1-10

Section 2– Installation 2-1 2.1 Operating Environment 2-2 2.2 Power Connections 2-2 2.2.1 AC Line Voltage Setting 2-2 2.2.2 Fuses 2-5 2.2.3 Battery Power 2-5 2.3 Frequency (Channel) Selection 2-5 2.3.1 Modulation Compensator 2-7 2.4 Receiver Frequency Selection 2-7 2.5 RF Connections 2-10 2.6 Audio Input Connections 2-11 2.7 SCA Input Connections 2-12 2.8 Composite Input Connection 2-12 2.9 Audio Monitor Connections 2-13 2.10 Pre-emphasis Selection 2-13 2.11 Program Input Fault Time-out 2-14 2.12 Remote I/O Connector 2-14

iii Section 3-Operation 3-1 3.1 Initial Power-up Procedures 3-2 3.2 Power Switches 3-4 3.2.1 DC Breaker 3-4 3.2.2 Power Switch 3-4 3.2.3 Carrier Switch 3-4 3.3 Front Panel Bar-Dot Displays 3-5 3.3.1 Audio Processor Input 3-5 3.3.2 Highband and Wideband Display 3-5 3.3.3 Modulation Display 3-5 3.4 Input Gain Switches 3-6 3.5 Processing Control 3-6 3.6 Stereo-Mono Switch 3-6 3.7 RF Output Control 3-7 3.8 Digital Multimeter 3-7 3.9 Fault Indicators 3-8

Section 4-Principals of Operation 4-1 4.1 Part Numbering 4-2 4.2 Audio Processor Circuit 4-3 4.3 Stereo Generator Circuit 4-4 4.4 RF Exciter Circuit Board 4-6 4.5 Metering Circuit Board 4-8 4.6 Motherboard 4-9 4.7 Display Circuit Board 4-10 4.8 Voltage Regulator Circuit Board 4-11 4.9 Power Regulator Circuit Board 4-12 4.10 RF Driver/Amplifier (FM30) 4-12 4.11 RF Driver (FM150/FM300) 4-13 4.12 RF Amplifier (FM150/FM300 4-13 4.13 Chassis 4-14 4.14 RF Output Filter & Reflectometer 4-14 4.15 Receiver Circuit Board Option 4-15

iv Section 5-Adjustments and Tests 5-1 5.1 Audio Processor Adjustments 5-2 5.1.1 Pre-Emphasis Selection 5-2 5.1.2 Pre-Emphasis Adjustment 5-2 5.2 Stereo Generator Adjustments 5-2 5.2.1 Separation 5-2 5.2.2 Composite Output 5-2 Using a Modulation Monitor 5-3 5.2.3 19kHz Level 5-4 5.2.4 19kHz Phase 5-4 5.3 Frequency Synthesizer Adjustments 5-4 5.3.1 Frequency (Channel) Selection 5-4 5.3.2 Modulation Compensator 5-4 5.3.3 Frequency Measurement and Adjustment 5-4 5.3.4 FSK Balance Control 5-5 5.4 Metering Board Adjustments 5-5 5.4.1 Power Calibrate 5-5 5.4.2 Power Set 5-5 5.4.3 SWR Calibrate 5-5 5.4.4 PA Current Limit 5-6 5.5 Motherboard Adjustments 5-6 5.6 Display Modulation Calibration 5-6 5.7 Voltage Regulator Adjustment 5-6 5.8 Bias Set (RF Power Amplifier) 5-7 5.9 Performance Verification 5-7 5.9.1 Audio Proof of Performance Measurements 5-7 5.9.2 De-Emphasis Input Network 5-7 5.10 Carrier Frequency 5-8 5.11 Output Power 5-8 5.12 RF Bandwidth and RF Harmonics 5-8 5.13 Pilot Frequency 5-8 5.14 Audio Frequency Response 5-9 5.15 Audio Distortion 5-9 5.16 Modulation Percentage 5-9 5.17 FM and AM Noise 5-9 5.18 Stereo Separation 5-9 5.19 Crosstalk 5-9 5.19.1 Main Channel Into Sub 5-10 5.19.2 Sub Channel Into Main 5-10 5.20 38kHz Subcarrier Suppression 5-10 5.21 Additional Checks 5-10

v Section 6-Reference Drawings 6-1 6.1 Views 6-2 6.2 Board Layouts and Schematics 6-4

Section 7-Service and Support 7-1 7.1 Service 7-2 7.2 24-Hour Support 7-2 7.3 Spare Parts 7-2

Transmitter Output Efficiency Appendix-1

Glossary G-1

Index Index-1

vi Section 1—Getting Acquainted

This section provides a general description of the FM30, FM150, and FM300 transmitters and introduces you to safety conventions used within this document. Review this material before installing or operating the transmitter.

Getting Acquainted 1-1 1.1 Your Transmitter

The FM30, FM150, and FM300 are members of a family of FM stereo broadcast transmitters. Crown transmitters are known for their integration, ease-of-use, and reliability.

The integration is most apparent in the standard transmitter configuration which incorporates audio processing, stereo generation, and RF amplification without compromised signal quality. A single Crown transmitter can replace several pieces of equipment in a traditional system.

Ease-of-use is apparent in the user-friendly front panel interface and in the installation procedure. Simply select your operating frequency (using 5 external switches), add an audio source, attach an antenna, and connect AC or DC power and you're ready to broadcast. Of course, the FM series of transmitters also feature more sophisticated inputs and monitoring connections if needed.

Reliability is a Crown tradition. The first Crown transmitters were designed for rigors of worldwide and potentially portable use. The modular design, quality components, engineering approach, and high production standards ensure stable performance.

Remote control and metering of the transmitter are made possible through a built-in I/O port. For more direct monitoring, the front panel includes a digital multimeter display and status indicators. Automatic control circuitry provides protection for high VSWR as well as high current, voltage, and temperature conditions.

Illustration 1-1 FM150 Stereo Broadcast Transmitter

This manual describes the FM30, FM150, and FM300 because all three transmitters share common design factors. Specific product differences are noted throughout the manual. In physical appearance, the FM30 differs from the FM150 and FM300 in that it lacks the power amplifier and cooling fan assembly on the back panel.

1-2 FM30/FM150/FM300 User’s Manual 1.2 Applications and Options

Crown transmitters are designed for versatility in applications. They have been used as stand-alone and backup transmitters and in booster, translator, satellator, and nearcast applications. The following discussion describes these applications further.

Model numbers describe the configuration of the product (which has to do with its intended purpose) and the RF output power which you can expect.

The number portion of each name represents the maximum RF output power. The FM300, for example, can generate up to 300 watts of RF output power.

Suffix letters describe the configuration. The FM300T, for example, is the standard or transmitter configuration. Except where specified, this document describes the transmitter configuration. In this configuration, the product includes the following components (functions):

• Audio Processor/Stereo Generator • RF Exciter • Metering • Low-Pass filter

Illustration 1–2 Standard (Transmitter) Configuration

Getting Acquainted 1-3 1.2.1 Stand-Alone

In the standard configuration, the FM30, FM150, and FM300 are ideal stand-alone transmitters. When you add an audio source (monaural, L/R stereo, or composite signal), an antenna, and AC or DC power, the transmitter becomes a complete FM stereo broadcast station, capable of serving a community. As stand-alone transmitters, Crown units often replace multiple pieces of equipment in a traditional setup (exciter, audio processor, RF amplifier).

1.2.2 Backup

In the standard configuration, Crown transmitters are also used in backup applications. Should your primary transmitter become disabled, you can continue to broadcast while repairs take place. In addition, the FM transmitters can replace disabled portions of your existing system including the exciter, audio processor, or amplifier. Transfer switches on each side of the existing and backup transmitters make the change-over possible with minimal downtime. The DC operation option of the FM30, FM150, and FM300 make them attractive backup units for those times when AC power is lost.

1.2.3 Exciter

In addition to the standard configuration, the FM30, FM150, and FM300 are available in optional configurations to meet a variety of needs. An "E" suffix, as in the FM30E, for example, represents an exciter-only configuration. In this configuration, the audio processor and stereo generator boards are replaced with circuitry to bypass their function. The exciter configurations are the least expensive way to get Crown quality components into your transmission system. You might consider the Crown exciter when other portions of your system are performing satisfactorily and you want to maximize your investment in present equipment.

1-4 FM30/FM150/FM300 User’s Manual 1.2.4 Translator

A receiver configuration (FM150R, for example) replaces the audio processor/stereo generator board with a receiver module. This added feature makes the FM30, FM150, and FM300 ideal for translator service in terrestrial-fed networks. These networks represent a popular and effective way to increase your broadcasting coverage. Translators, acting as repeater emitters, are necessary links in this chain of events. Traditionally, network engineers have relied on multiple steps and multiple pieces of equipment to accomplish the task. Others have integrated the translator function (receiver and exciter) to feed an amplifier. Crown, on the other hand, starts with an integrated transmitter and adds a solid-state Receiver Module to form the ideal translator.

Illustration 1–3 Crown's Integrated Translator

This option enables RF in and RF out on any of Crown’s FM series of transmitters. In addition, the module supplies a composite output to the RF exciter portion of the transmitter. From here, the signal is brought to full power by the built-in power amplifier for retransmission. The Receiver Module has been specifically designed to handle SCA channel output up to 100 kHz for audio and high-speed data. FSK ID programming is built-in to ensure compliance with FCC regulations regarding the on-air identification of translators. Simply specify the call sign of the repeater station when ordering. Should you need to change the location of the translator, replacement FSK chips are available. The Receiver Module option should be ordered at the time of initial transmitter purchase. However, an option kit is available for field converting existing Crown units. In the translator configuration there are differences in the function of the front panel, see Section 3 for a description.

Getting Acquainted 1-5 1.2.5 Satellator

One additional option is available for all configurations—an FSK Identifier (FSK IDer). This added feature enables the FM30, FM150, and FM300 to transmit its call sign or operating frequency in a Morse code style. This option is intended for use in satellite-fed networks. Transmitters equipped in this fashion are often known as "satellators." Connect the transmitter to your satellite receiver and the pre-programmed FSK IDer does the rest—shifting the frequency to comply with FCC requirements and in a manner that is unnoticeable to the listener. The FSK IDer module should be ordered at the time you order your transmitter, but is available separately (factory programmed for your installation).

Illustration 1–4 Transmitter with FSK IDer Option

Add the FSK IDer option to the exciter configuration for the most economical satellator (a composite input signal is required). 1.2.6 Nearcasting

The output power of an FM30 transmitter can be reduced to a level that could function as a near-cast transmitter. Crown transmitters have been used in this way for language transla- tion, for re-broadcasting the audio of sporting events within a stadium, and for specialized local radio. The FM30 is the only transmitter that is appropriate for this application.

1-6 FM30/FM150/FM300 User’s Manual 1.3 Transmitter/Exciter Specifications Frequency Range 87.9 MHz–107.9 MHz (76 MHz–90 MHz optionally available) RF Power Output (VSWR 1.7:1 or better) FM30 3-33 Watts adjustable

FM150 15-165 Watts adjustable

FM300 30-330 Watts adjustable

RF Output Impedance 50 Ohms

Frequency Stability Meets FCC specifications from 0-50 degrees C

Audio Input Impedance 50k Ω bridging, balanced, or 600 Ω

Audio Input Level Selectable for –10 dBm to +10 dBm for 75 kHz deviation at 400 Hz

Pre-emphasis Selectable for 25, 50, or 75 µsec; or flat

Audio Response Conforms to 75 µsec pre-emphasis curve as follows:

Complete Transmitter ±0.30 dB (50 Hz–10 kHz) ±1.0 dB (10 kHz–15 kHz)

Exciter only ±0.25 dB (50 Hz–15 kHz)

Distortion (THD + Noise)

Complete Transmitter Less than 0.7% (at 15kHz)

Exciter only Less than 0.3% (50Hz-15kHz)

Stereo Separation

Complete Transmitter Better than –40dB (50Hz-15kHz)

Exciter only Better than –40dB (50Hz-15kHz)

Crosstalk Main into Sub, better than –40dB Sub into Main, better than –40dB

Stereo Pilot 19 kHz ±2 Hz, 9% modulation

Getting Acquainted 1-7 Subcarrier Suppression 50dB below ±75 kHz deviation

FM S/N Ratio (FM noise)

Complete Transmitter Better than –60dB

Exciter only Better than –70dB

AM S/N Ratio Asynchronous and synchronous noise better than FCC requirements

RF Bandwidth ±120 kHz, better than –35 dB

±240 kHz, better than –45 dB

RF Spurious Products Better than –70dB

Operating Environment Temperature (0°C to 50°C)

Humidity (0 to 80% at 20°C)

Maximum Altitude (3,000 Meters; 9834 Feet

AC Power 100,120, 220, or 240 volts +10%/- 15%); 50/60Hz

FM30 115VA

FM150 297VA

FM300 550VA

DC Power

FM30 24-36 volts (36 volts at 3 amps required for full output power)

FM150 36-72 volts (48 volts @ 7 amps for full output power)

FM300 36-72 volts (72 volts @ 10 amps for full output power)

1-8 FM30/FM150/FM300 User’s Manual Note: We set voltage and ampere requirements to assist you in designing your system. De- pending on your operating frequency, actual requirements for maximum voltage and current readings are 10–15% lower than stated.

Regulatory Type notified FCC parts 73 and 74 Meets FCC, DOC, and CCIR requirements

Dimensions 13.5 x 41.9 x 44.5 cm 5.25 x 16.5 x 17.5 inches

Weight FM30 10.5 kg (23 lbs) 13.6 kg (30 lbs) shipping weight

FM150 11.4 kg (25 lbs) 14.5 kg (32 lbs) shipping weight

FM300 16.8 kg (37 lbs) 20.0 kg (44 lbs) shipping weight

Getting Acquainted 1-9 1.4 Receiver Specifications

Monaural Sensitivity (demodulated, de-emphasized) 3.5 µ V for signal-to-noise > 50 dB

Stereo Sensitivity (19–kHz pilot frequency added) 31 µ V for signal-to-noise > 50 dB

Connector Standard type N, 50 Ω

Shipping Weight 1 lb

1.5 Safety Considerations

Crown Broadcast assumes the responsibility for providing you with a safe product and safety guidelines during its use. “Safety” means protection to all individuals who install, operate, and service the transmitter as well as protection of the transmitter itself. To promote safety, we use standard hazard alert labeling on the product and in this manual. Follow the associated guidelines to avoid potential hazard.

1.5.1 Dangers

DANGER represents the most severe hazard alert. Extreme bodily harm or death will occur if DANGER guidelines are not followed.

1.5.2 Warnings

WARNING represents hazards which could result in severe injury or death.

1.5.3 Cautions

CAUTION indicates potential personal injury, or equipment or property damage if the associated guidelines are not followed. Particular cautions in this text also indicate unauthorized radio-frequency operation.

Illustration 1–5 Sample Hazard Alert

1-10 FM30/FM150/FM300 User’s Manual Section 2—Installation

This section provides important guidelines for installing your transmitter. Review this information carefully for proper installation.

Installation 2-1 2.1 Operating Environment

You can install the FM transmitter in a standard component rack or on a suitable surface such as a bench or desk. In any case, the area should be as clean and well ventilated as possible. Always allow for at least 2 cm of clearance under the unit for ventilation. If you set the transmitter on a flat surface, install spacers on the bottom cover plate. If you install the transmitter in a rack, provide adequate clearance above and below. Do not locate the transmitter directly above a hot piece of equipment.

2.2 Power Connections

The FM30, FM150, and FM300 operate on 100, 120, 220, or 240 volts AC (50 or 60 Hz; single phase). Each transmitter can operate on DC power as well (28 volts for the FM30, 48 volts for the FM150, and 72 volts for the FM300). The transmitter can operate on fewer volts DC, but with reduced RF output power (see section 1.3). In addition, the transmitter isolates the AC and DC sources; both can be connected at the same time to provide battery backup in the event of an AC power failure.

2.2.1 AC Line Voltage Setting

To change the voltage setting, follow these steps:

1. Disconnect the power cord if it is attached.

2. Open the cover of the power connector assembly using a small, flat blade screw driver. See Illustration 2–1.

3. Insert the screwdriver into the voltage selection slot and remove the drum from the assembly.

4. Rotate the drum to select the desired voltage. See Illustration 2–2.

5. Replace the drum and cover and check to see that the correct voltage appears in the connector window.

6. Connect the AC power cord.

2-2 FM30/FM150/FM300 User’s Manual Illustration 2–1 Removing the Power Connector Cover

Illustration 2–2 Selecting an AC Line Voltage

Installation 2-3 2.2.2 Fuses

The fuse holders are located in the power connector assembly just below the voltage selector.

Illustration 2–3 Fuse Holder

For 100 to 120 VAC operation, use the fuse installed at the factory. For 220 to 240 VAC operation, use the slow-blow fuse located in a hardware kit within the transmitter packaging. Consult the following table:

Transmitter Input Power Fuse

FM30 100–120 V 3 A 220–240 V 1.5 A

FM150 100–120 V 6.3 A 220–240 V 4 A

FM300 100–120 V 12.5 A 220–240 V 6.3 A Illustration 2–4 Fuse Reference Table

2-4 FM30/FM150/FM300 User’s Manual 2.2.3 Battery Power

Your transmitter can operate on a DC power source (such as 4 or 5, 12–volt deep cycle batteries connected in series). The FM30 requires 28 volts DC for full output power, while the FM150 requires 48 volts, and FM300 requires 72 volts for full output power. Connect the batteries to the red (+) and black (–) battery input binding posts on the rear panel.

2–5 Illustration DC Input Terminals

2.3 Frequency (Channel) Selection

Your transmitter is capable of operating between 87.9 and 107.9 MHz in the FM band. The transmitter can also operate between 76 and 90 MHz by shorting pins 9 and 10 of J20 on the motherboard. (See illustration 2-6)

To adjust the operating frequency, follow these steps:

1. Locate the frequency selector switches on the front panel which will be used to change the setting. See Illustrations 2–6 and 2–7.

Installation 2-5 2. Use small flat blade screwdriver or another suitable device to rotate the switches to the desired setting. (The selected number will appear directly above the white indicator dot on each switch.) See examples of selected frequencies in the illustration below.

3. To change the operating band from 87.9-107.9MHz to 76-90MHz or vice versa, or to adjust the modulation compensation pot, remove the top cover to gain access to these fea- tures. See illustrations 2-6 and 2-10.

Illustration 2–6 Top Cover Removed

Megahertz .1 .01 Illustration 2–7 Transmitter Front Panel (Frequency Selector Switches)

= 88.10 MHz

= 107.90 MHz

Illustration 2–8 Two Sample Frequency Selections

2-6 FM30/FM150/FM300 User’s Manual 2.3.1 Modulation Compensator

The Modulation trim-potentiometer (see illustration 2–10) compensates for slight variations in deviation sensitivity with frequency. Set the trim-pot dial according to the following graph:

Frequency of Operation (MHz) Modulation Compensation Pot Setting

108 0 106 10 104 15 102 25 100 35 98 40 97.1 45 96 55 94 60 92 70 90 75 88 80 86 80 84 80 82.4 70 82 65 80 55 78 30 76 0 Illustration 2–9 Modulation Compensator Settings These compensator settings are approximate. Each mark on the potentiometer represents about 1.8% modulation compensation.

Illustration 2–10 Modulation Compensator Pot

Installation 2-7 2.4 Receiver Frequency Selection

If you have a transmitter equipped with the receiver option, you will need to set the receiving or incoming frequency.

1. With the top cover removed, locate the receiver module and the two switches (labeled SW1 and SW2).

Illustration 2–11 Receiver Module Switches

2. Use the adjacent chart to set the switches for the desired incoming frequency.

3. For frequencies in the Japan FM band, short pins 7&8 on J1 on the receiver card.

4. For 75us pre-emphasis short pins 3&4 and 5&6 on J2 of the Receiver card.

5. For 50us pre-emphasis short pins 1&2 and 7&8 on J2 of the Receiver card.

6. After setting the frequency, replace the top cover and screws.

2-8 FM30/FM150/FM300 User’s Manual Freq. 74-90 Freq. 88-108 SW1 SW2 Freq. 74-90 Freq. 88-108 SW1 SW2 MHz MHz MHz MHz 74.9 87.9 0 0 78.9 91.9 1 4 75.0 88.0 8 0 79.0 92.0 9 4 75.1 88.1 0 1 79.1 92.1 1 5 75.2 88.2 8 1 79.2 92.2 9 5 75.3 88.3 0 2 79.3 92.3 1 6 75.4 88.4 8 2 79.4 92.4 9 6 75.5 88.5 0 3 79.5 92.5 1 7 75.6 88.6 8 3 79.6 92.6 9 7 75.7 88.7 0 4 79.7 92.7 1 8 75.8 88.8 8 4 79.8 92.8 9 8 75.9 88.9 0 5 79.9 92.9 1 9 76.0 89.0 8 5 80.0 93.0 9 9 76.1 89.1 0 6 80.1 93.1 1 A 76.2 89.2 8 6 80.2 93.2 9 A 76.3 89.3 0 7 80.3 93.3 1 B 76.4 89.4 8 7 80.4 93.4 9 B 76.5 89.5 0 8 80.5 93.5 1 C 76.6 89.6 8 8 80.6 93.6 9 C 76.7 89.7 0 9 80.7 93.7 1 D 76.8 89.8 8 9 80.8 93.8 9 D 76.9 89.9 0 A 80.9 93.9 1 E 77.0 90.0 8 A 81.0 94.0 9 E 77.1 90.1 0 B 81.1 94.1 1 F 77.2 90.2 8 B 81.2 94.2 9 F 77.3 90.3 0 C 81.3 94.3 2 0 77.4 90.4 8 C 81.4 94.4 A 0 77.5 90.5 0 D 81.5 94.5 2 1 77.6 90.6 8 D 81.6 94.6 A 1 77.7 90.7 0 E 81.7 94.7 2 2 77.8 90.8 8 E 81.8 94.8 A 2 77.9 90.9 0 F 81.9 94.9 2 3 78.0 91.0 8 F 82.0 95.0 A 3 78.1 91.1 1 0 82.1 95.1 2 4 78.2 91.2 9 0 82.2 95.2 A 4 78.3 91.3 1 1 82.3 95.3 2 5 78.4 91.4 9 1 82.4 95.4 A 5 78.5 91.5 1 2 82.5 95.5 2 6 78.6 91.6 9 2 82.6 95.6 A 6 78.7 91.7 1 3 82.7 95.7 2 7 78.8 91.8 9 3 82.8 95.8 A 7 Illustration 2–12-1 Receiver Frequency Selection (Continued on next page)

Installation 2-9 Freq. 74-90 Freq. 88-108 SW1 SW2 Freq. 74-90 Freq. 88-108 SW1 SW2 MHz MHz MHz MHz 82.9 95.9 2 8 86.6 99.6 B A 83.0 96.0 A 8 86.7 99.7 3 B 83.1 96.1 2 9 86.8 99.8 B B 83.2 96.2 A 9 86.9 99.9 3 C 83.3 96.3 2 A 87.0 100.0 B C 83.4 96.4 A A 87.1 100.1 3 D 83.5 96.5 2 B 87.2 100.2 B D 83.6 96.6 A B 87.3 100.3 3 E 83.7 96.7 2 C 87.4 100.4 B E 83.8 96.8 A C 87.5 100.5 3 F 83.9 96.9 2 D 87.6 100.6 B F 84.0 97.0 A D 87.7 100.7 4 0 84.1 97.1 2 E 87.8 100.8 C 0 84.2 97.2 A E 87.9 100.9 4 1 84.3 97.3 2 F 88.0 101.0 C 1 84.4 97.4 A F 88.1 101.1 4 2 84.5 97.5 3 0 88.2 101.2 C 2 84.6 97.6 B 0 88.3 101.3 4 3 84.7 97.7 3 1 88.4 101.4 C 3 84.8 97.8 B 1 88.5 101.5 4 4 84.9 97.9 3 2 88.6 101.6 C 4 85.0 98.0 B 2 88.7 101.7 4 5 85.1 98.1 3 3 88.8 101.8 C 5 85.2 98.2 B 3 88.9 101.9 4 6 85.3 98.3 3 4 89.0 102.0 C 6 85.4 98.4 B 4 89.1 102.1 4 7 85.5 98.5 3 5 89.2 102.2 C 7 85.6 98.6 B 5 89.3 102.3 4 8 85.7 98.7 3 6 89.4 102.4 C 8 85.8 98.8 B 6 89.5 102.5 4 9 85.9 98.9 3 7 89.6 102.6 C 9 86.0 99.0 B 7 89.7 102.7 4 A 86.1 99.1 3 8 89.8 102.8 C A 86.2 99.2 B 8 89.9 102.9 4 B 86.3 99.3 3 9 90.0 103.0 C B 86.4 99.4 B 9 X 103.1 4 C 86.5 99.5 3 A X 103.2 C C Illustration 2–12-2 Receiver Frequency Selection (Continued on next page)

2-10 FM30/FM150/FM300 User’s Manual Freq. 74-90 Freq. 88-108 SW1 SW2 Freq. 74-90 Freq. 88-108 SW1 SW2 MHz MHz MHz MHz X 103.3 4 D X 107.0 D F X 103.4 C D X 107.1 6 0 X 103.5 4 E X 107.2 E 0 X 103.6 C E X 107.3 6 1 X 103.7 4 F X 107.4 E 1 X 103.8 C F X 107.5 6 2 X 103.9 5 0 X 107.6 E 2 X 104.0 D 0 X 107.7 6 3 X 104.1 5 1 X 107.8 E 3 X 104.2 D 1 X 107.9 6 4 X 104.3 5 2 X 108.0 E 4 X 104.4 D 2 X 104.5 5 3 X 104.6 D 3 X 104.7 5 4 X 104.8 D 4 X 104.9 5 5 X 105.0 D 5 X 105.1 5 6 X 105.2 D 6 X 105.3 5 7 X 105.4 D 7 X 105.5 5 8 X 105.6 D 8 X 105.7 5 9 X 105.8 D 9 X 105.9 5 A X 106.0 D A X 106.1 5 B X 106.2 D B X 106.3 5 C X 106.4 D C X 106.5 5 D X 106.6 D D X 106.7 5 E X 106.8 D E X 106.9 5 F Illustration 2–12-3 Receiver Frequency Selection

Installation 2-11 2.5 RF Connections

Connect the RF load, an antenna or the input of an external power amplifier, to the type-N, RF output connector on the rear panel. VSWR should be 1.5:1 or better.

The RF monitor is intended primarily for a modulation monitor connection. Information gained through this connection can supplement that which is available on the transmitter front panel displays. If your transmitter is equipped with the receiver option, connect the incoming RF to the RF IN connector.

Illustration 2–13 RF Connections

2-12 FM30/FM150/FM300 User’s Manual 2.6 Audio Input Connections

Attach audio inputs to the Left and Right XLR connectors on the rear panel. (The Left channel audio is used on Mono.) Pin 1 of the XLR connector goes to chassis ground. Pins 2 and 3 represent a balanced differential input with an impedance of about 50 kΩ . They may be connected to balanced or unbalanced left and right program sources. The audio input cables should be shielded pairs, whether the source is balanced or unbalanced. For an unbalanced program source, one line (preferably the one connecting to pin 3) should be grounded to the shield at the source. Audio will then connect to the line going to pin 2.

Illustration 2–14 XLR Audio Input Connectors

By bringing the audio return line back to the program source, the balanced differential input of the transmitter is used to best advantage to minimize noise. This practice is especially helpful if the program lines are fairly long, but is a good practice for any distance. If the program source requires a 600 Ω termination, see the motherboard configuration chart on page 4-9 for the proper configuration of the jumpers.

Installation 2-13 2.7 SCA Input Connections

You can connect external SCA generators to the SCA In connectors (BNC-type) on the rear panel. The inputs are intended for the 60 kHz to 99 kHz range, but a lower frequency may be used if the transmitter is operated in Mono mode. (The 23 to 53 kHz band is used for stereo transmission.) For 7.5 kHz deviation (10% modulation), input of approximately 3.5–volts (peak-to-peak) is required.

Illustration 2–15 SCA Input Connectors

2.8 Composite Input Connection

You may feed composite stereo (or mono audio) directly to the RF exciter bypassing the internal audio processor and stereo generator. To use the Crown transmitter as an RF Exciter only ("E" version or when using the "T" version with composite input), it is necessary to use the Composite Input section of the transmitter. This will feed composite stereo (or mono audio) directly to the RF exciter. In the "T" version, this will bypass the internal audio processor and stereo generator.

Input sensitivity is approximately 3.5–volt P-P for 75 kHz deviation.

1. Enable the Composite Input by grounding pin 14 of the Remote I/O connector (see Illustration 2–18).

2. Connect the composite signal using the Composite In BNC connector.

2-14 FM30/FM150/FM300 User’s Manual Illustration 2–16 Composite In and Audio Monitor Connections

2.9 Audio Monitor Connections

Processed, de-emphasized samples of the left and right audio inputs to the stereo generator are available at the Monitor jacks on the rear panel. The signals are suitable for feeding a studio monitor and for doing audio testing. De-emphasis is normally set for 75 µsec; set to 50 µsec by moving jumpers, HD201 and HD202, on the Audio Processor/Stereo Generator board.

2.10 Pre-emphasis Selection

Select the pre-emphasis curve (75 µsec, 50 µsec, 25 µsec, or Flat) by jumpering the appropriate pins of header HD1 on the Audio Processor/Stereo Generator board. If you change the pre-emphasis, change the de-emphasis jumpers HD201 and HD202 on the Audio Proc- essor/Stereo Generator board to match.

Installation 2-15 2.11 Program Input Fault Time-out

You can enable an automatic turn-off of the carrier in the event of program failure. To enable this option, see illustration 2-18 on page 2-16. The time between program failure and carrier turn-off is set by a jumper (JP1) on the voltage regulator board (see page 6–14 for board location). Jumper pins 1 and 2 (the two pins closest to the edge of the board) for a delay of approximately 30 seconds; pins 3 and 4 for a 2–minute delay; pins 5 and 6 for a 4– minute delay, and pins 7 and 8 for an 8– minute delay.

2.12 Remote I/O Connector

Remote control and remote metering of the transmitter is made possible through a 25–pin, D-sub connector on the rear panel. (No connections are required for normal operation.)

Illustration 2–17 Remote I/O Connector

Illustration 2–18 Remote I/O Connector (DB-25 Female)

2-16 FM30/FM150/FM300 User’s Manual Pin Number Function

1. Ground

2. FMV Control

3. Composite Out (sample of stereo generator output)

4. FSK In (Normally high; pull low to shift carrier frequency approximately 7.5 KHz. Connect to open collector or relay contacts of user-supplied FSK keyer.)

5. /Auto Carrier Off (Pull low to enable automatic turnoff of carrier with program failure.)

6. Meter Battery (Unregulated DC voltage; 5 VDC=50 VDC)

7. Meter RF Watts (1 VDC = 100 Watts)

8. Meter PA Volts (5 VDC = 50VDC)

9. Remote Raise (A momentary switch, holding this pin low will slowly raise the RF output)

10. Remote Lower (A momentary switch, holding this pin low will slowly lower the RF output)

11. Remote SWR (A buffered metering output with a calculated reading of standing wave ratio in VDC.)

12. External ALC Control

13. No Connection

14. /Ext. Enable (Pull low to disable the internal stereo generator and enable External Composite Input.)

15. 38 KHz Out (From stereo generator for power supply synchronization. For transmitter equipped with receiver option, this pin becomes the right audio output for an 8- ohm monitor speaker. 38 KHz is disabled.)

16. ALC

17. /Carrier Off ( Pull low to turn carrier off)

18. Fault Summary ( line goes high if any fault light is activated.)

19. Meter PA Temperature (5 VDC=100 degrees C.)

20. Meter PA Current (1VDC=10 DC Amperes.)

21. Front Panel Voltmeter Input.

22. No Connection.

23. RDS RX

24. RDS TX

25. Ground

Installation 2-17 Notes:

2-18 FM30/FM150/FM300 User’s Manual Section 3—Operation

This section provides general operating parameters of your transmitter and a detailed description of its front panel display.

Operation 3-1 3.1 Initial Power-up Procedures

These steps summarize the operating procedures you should use for the initial operation of the transmitter. More detailed information follows.

1. Turn on the DC breaker.

Illustration 3–1 DC Breaker

2. Turn on the main power switch.

Main Power Switch

Illustration 3–2 Front Panel Power Switch

3-2 FM30/FM150/FM300 User’s Manual 3. Verify the following: A. The bottom cooling fan runs continuously. B. The Lock Fault indicator flashes for approximately 5 seconds, then goes off.

4. Set the Input Gain switches for mid-scale wideband gain reduction on an average program level (see section 3.4).

5. Set the Processing control (see section 3.5; normal setting is “50”).

6. Set the Stereo-Mono switch to Stereo (see section 3.6).

7. Turn on the Carrier switch.

8. Check the following parameters on the front panel multimeter: A. RF Power should be 29–33 watts for the FM30, 145–165 watts for the FM150, and 300–330 watts for the FM300.

B. SWR should be less than 1.1. (A reading greater than 1.25 indicates an antenna mismatch.

C. ALC should be between 4.00 and 6.00 volts.

D. PA DC Volts should be 26–30 volts for the FM30, 25–35 volts for the FM150, and 37–52 volts for the FM300. (Varies with antenna match, power, and frequency.)

E. PA DC Amperes should be 1.5–2.5 amps for the FM30, 5.5–7.5 amps for the FM150, and 7.0–9.0 amps for the FM300. (Varies with antenna match, power, and frequency.)

F. PA Temperature should initially read 20–35 degrees C (room temperature). After one hour the reading should be 35–50 degrees C.

G. Supply DC Volts should display a typical reading of 45 V with the carrier on and 50 V with the carrier off for both the FM30 and FM150 products. For the FM300, the readings should be 65 V with the carrier on and 75 V with carrier off.

H. Voltmeter should be reading 0.0.

The remainder of this section describes the functions of the front panel indicators and switches.

Operation 3-3 3.2 Power Switches

3.2.1 DC Breaker

The DC breaker, on the rear panel, must be on (up) for transmitter operation, even when using AC power. Electrically, the DC breaker is located immediately after diodes which iso- late the DC and AC power supplies.

3.2.2 Power Switch

The main on/off power switch controls both the 120/240 VAC and the DC battery power input.

3.2.3 Carrier Switch

This switch controls power to the RF amplifiers and supplies a logic high to the voltage regulator board, which enables the supply for the RF driver. In addition, the Carrier Switch controls the operating voltage needed by the switching power regulator. A "Lock Fault" or a low pin 17 (/Carrier Off) on the Remote I/O connector will hold the carrier off. (See section 2.12.)

Carrier Switch

Illustration 3–3 Front Panel Carrier Switch

3-4 FM50/FM150/FM300 User’s Manual 3.3 Front Panel Bar-Dot Displays

Bar-dot LEDs show audio input levels, wideband and highband audio gain control, and modulation percentage. Resolution for the gain control and modulation displays is increased over a conventional bar-graph display using dither enhancement which modulates the brightness of the LED to give the effect of a fade from dot to dot. (See section 4.7.)

3.3.1 Audio Processor Input

Two vertical, moving-dot displays for the left and right channels indicate the relative audio levels, in 3 dB steps, at the input of the audio processor. Under normal operating conditions, the left and right Audio Processor indicators will be active, indicating the relative audio input level after the Input Gain switches. During program pauses, the red Low LED will light.

The translator configuration shows relative audio levels from the included receiver.

3.3.2 Highband and Wideband Display

During audio processing, the moving-dot displays indicate the amount of gain control for broadband (Wide) and pre-emphasized (High) audio. As long as program material causes activity of the Wideband green indicators, determined by the program source level and Input Gain switches, the transmitter will be fully modulated. (See section 3.4.)

The Wideband indicator shows short-term “syllabic-rate” expansion and gain reduction around a long-term (several seconds) average gain set. In the translator configuration, the Wideband indicator also shows relative RF signal strength.

Program material and the setting of the Processing control determine the magnitude of the short-term expansion and compression (the rapid left and right movement of the green light).

High-frequency program content affects the activity of the Highband indicator. With 75–µsec pre-emphasis, Highband processing begins at about 2 kHz and increases as the audio frequency increases. Some programs, especially speech, may show no activity while some music programs may show a great deal of activity.

3.3.3 Modulation Display

A 10–segment, vertical peak-and-hold, bar graph displays the peak modulation percentage. A reading of “100” coincides with 75 kHz deviation. The display holds briefly (about 0.1 seconds) after the peak. The “Pilot” indicator illuminates when the transmitter is in the stereo mode.

To verify the actual (or more precise) modulation percentage, connect a certified modulation monitor to the RF monitor jack on the rear panel.

Operation 3-5 3.4 Input Gain Switches

The “+6 dB” and “+12 dB” slide switches set audio input sensitivity according to the following table.

Normal Input Switches Sensitivity +6dB +12dB

+10dBm Down Down

+4dBm Up Down

-2dBm Down Up

-8dBm Up Up

Illustration 3–4 Input Gain Switches

Find, experimentally, the combination of Input Gain switch settings that will bring the Wideband gain-reduction indicator to mid scale for “normal” level program material. The audio processor will accommodate a fairly wide range of input levels with no degradation of audio quality.

3.5 Processing Control

Two factors contribute to the setting of the Processing control: program material and personal taste. For most program material, a setting in the range of 40 to 70 provides good program density. For the classical music purist, who might prefer preservation of music dynamics over density, 10 to 40 is a good range. The audio will be heavily processed in the 70 to 100 range.

If the program source is already well processed, as might be the case with a satellite feed, set the Processing to “0” or “10”.

3.6 Stereo-Mono Switch

The Stereo-Mono slide switch selects the transmission mode. In Mono, feed audio only to the left channel. Although right-channel audio will not be heard as audio modulation, it will affect the audio processing.

3-6 FM30/FM150/FM300 User’s Manual 3.7 RF Output Control

Set this control for the desired output power level. Preferably, set the power with an external RF wattmeter connected in the coaxial line to the antenna. You may also use the RF power reading on the digital multimeter. The control sets the RF output voltage. Actual RF output power varies as the approximate square of the relative setting of the control. For example, a setting of “50” is approximately 1/4 full power.

3.8 Digital Multimeter

The four-digit numeric display in the center of the front panel provides information on transmitter operation. Use the “Up” and “down” push-buttons to select one of the following parameters. A green LED indicates the one selected.

Illustration 3–5 Digital Multimeter

RF Power—Actually reads RF voltage squared, so the accuracy can be affected by VSWR (RF voltage-to-current ratio). See section 5.4 for calibration. Requires calibration with the RF reflectometer being used.

SWR—Direct reading of the antenna standing-wave ratio (the ratio of the desired load impedance, 50 ohms, to actual load).

ALC—DC gain control bias used to regulate PA supply voltage. With the PA power supply at full output voltage, ALC will read about 6.0 volts. When the RF output is being regulated by the RF power control circuit, this voltage will be reduced, typically reading 4 to 5.5 volts. The ALC voltage will be reduced during PA DC overcurrent, SWR, or LOCK fault conditions.

Operation 3-7 PA DC Volts—Supply voltage of the RF power amplifier.

PA DC Amps—Transistor drain current for the RF power amplifier.

PA DC Temperature—Temperature of the RF power amplifier heatsink in degrees C.

Supply DC Volts—Unregulated DC voltage at the input of the voltage regulators. For battery operation, this reading is the battery voltage minus a diode drop.

Voltmeter—Reads the voltage at a test point located on the front edge of the motherboard. A test lead connected to this point can be used for making voltage measurements in the transmitter. The test point is intended as a servicing aid; an alternative to an external test meter. Remember that the accuracy is only as good as the reference voltage used by the metering circuit. Servicing a fault affected by the reference affects the Voltmeter reading. The metering scale is 0 to 199.9 volts.

In the translator configuration, you can read a relative indication of RF signal strength nu- merically in the Voltmeter setting.

3.9 Fault Indicators

Faults are indicated by a blinking red light as follows:

SWR—Load VSWR exceeds 1.5:1. ALC voltage is reduced to limit the reflected RF power.

Lock—Frequency synthesizer phase-lock loop is unlocked. This indicator normally blinks for about five seconds at power turn-on. Whenever this light is blinking, supply voltages will be inhibited for the RF driver stage as well as for the RF power amplifier.

Input—The automatic carrier-off circuit is enabled (see sections 2.11 and 2.12) and the absence of a program input signal has exceeded the preset time. (The circuit treats white or pink noise as an absence of a program.)

PA DC—Power supply current for the RF power output amplifier is at the preset limit. ALC voltage has been reduced, reducing the PA supply voltage to hold supply current to the preset limit.

PA Temp—PA heatsink temperature has reached 50° C (122° F) for the FM30 and 80° C (176° F) for the FM150 and FM300.

At about 55° C (131°F) for the FM30 or 82°C (180° F) for the FM150 and FM300, ALC voltage begins to decrease, reducing the PA supply voltage to prevent a further increase in temperature. By 60° C (140° F) for the FM50 and 85° C (185° F) for the FM150 and FM300, the PA will be fully cut off. The heatsink fan (models FM150°and FM300 only) is proportion- ally controlled to hold the heatsink at 35 C (95° F). Above this temperature, the fan runs at full speed.

3-8 FM30/FM150/FM300 User’s Manual Section 4—Principles of Operation

This section discusses the circuit principles upon which the transmitter functions. This information is not needed for day-to-day operation of the transmitter but may be useful for advanced users and service personnel.

Principles of Operation 4-1 4.1 Part Numbering

As this section refers to individual components, you should be familiar with the part numbering scheme used.

The circuit boards and component placement drawings use designators such as “R1”, “R2”, and “C1.” These same designators are used throughout the transmitter on several different circuit boards and component placement drawings. When referencing a particular component it is necessary to also reference the circuit board that it is associated with.

4-2 FM50/FM150/FM300 User’s Manual 4.2 Audio Processor/Stereo Generator Circuit Board

The audio board provides the control functions of audio processing-compression, limiting, and expansion, as well as stereo phase-error detection, pre-emphasis and generation of the composite stereo signal.

Illustration 6-4 and accompanying schematic may be useful to you during this discussion. The overall schematic for the audio board is divided into two sheets; one each for the processor and stereo generator sections of the board.

Reference numbers are for the left channel. Where there is a right-channel counterpart, reference number are in parenthesis.

Illustration 4–1 Audio Processor/Stereo Generator Board

4.2.1 Audio Processor Section

Audio input from the XLR connector on the rear panel of the transmitter goes to instrument amplifier, U2 (U8). Two-bit binary data on the +6 dB and +12 dB control lines sets the gain of U2 (U8) to one of four levels in 6-dB steps. Gain of U2 is determined by R5, R6, or R7 (R45, R46, or R47) as selected by analog switch U1.

U3 (U9) is a THAT2180 voltage-controlled amplifier with a control-voltage-to-gain constant of 6.1 mV/dB. The 2180 is a current-in/current-out device, so signal voltages at the input and output will be zero. R11 converts the audio voltage at the output of U2 (U8) to current at the input of U3 (U9). U3 (U9) output current is converted to audio voltage by U4A (U10A).

U4B (U10B) is a unity-gain inverter. When the positive peaks at the output of U4A (U10A) or U4B (U10B) exceeds the gain-reduction threshold, U15 generates a 0.25 Volts-per-dB DC control bias, producing wide-band gain reduction for U3 (U9). The dB-linear allows a front- panel display of gain control on a linear scale with even distribution of dB.

Principles of Operation 4-3 Q1 (Q2) is a recover/expansion gate with a threshold about 18 dB below the normal program level. The amount of short-term expansion and time for gain recovery is controlled by the PROCESSING control, located on the front panel display board. (See section 3.5.)

Audio components above 15,200 Hz are greatly attenuated by eighth-order switched- capacitor elliptical filter, U5 (U11). The filter cut-off frequency is determined by a 1.52-MHz clock (100 x 15,200 Hz) signal from the stereo generator section of the board. The broadband signal level at the output of U5 (U11) is about 5 dB below that required for full modulation. (With normal program material, the 5 dB of headroom will be filled with pre- emphasized audio.)

Pre-emphasis in microseconds is the product of the capacitance of C7 (C17), multiplied by the current-gain of U6 (U12), times the value of R22 (R62). (For description of the device used for U6 (12), see explanation for U3 (U9) above.) For a 75 micro-seconds pre- emphasis, the gain of U6 (U12) will be about 1.11.

Selection of the pre-emphasis curve (75 µS, 50 µS, or Flat) is made by moving the jumper on HD1 to the pins designated on the board. Fine adjustment of the pre-emphasis is made with R23 (R63). (See section 5.1.)

For high-band processing, the peak output of U7A (U13A) and U7B (U13B) is detected and gain-reduction bias is generated, as with the broadband processor. The high-band processing, however, shifts the pre-emphasis curve rather than affecting overall gain. Peak audio voltages are compared to plus and minus 5-volt reference voltages at the outputs of U19A and U19B. This same reference voltage is used in the stereo generator section.

A stereo phasing error occurs when left and right inputs are of equal amplitude but opposite polarity. The most common cause is incorrect wiring of a left or right balanced audio line somewhere in the program chain-sometimes at the source of a recording. When this happens, all the audio is in the left-minus-right stereo subcarrier-none in the left-plus-right baseband. The error can go unnoticed by one listening on a stereo receiver, but the audio may disappear on a mono receiver. In normal programming there may be short-term polarity re- versals of left versus right, either incidental or-for effect-intentional. A phase error of several seconds duration is processed by U14A and U14B and interpreted as a real error. During a phasing error the right-channel level is gradually reduced by 6 dB. For a listener to a stereo radio, the right-channel volume will be lower, while on a mono receiver there will be a reduction of volume.

NORMAL/TEST switch. In the TEST position, the stage gains are set to a fixed level. See section 6.2

4.2.2 Stereo Generator Section

Composite stereo signal is generated from left and right-channel audio inputs. This section also has the amplifier (U201) for an optional external composite input and provision for in- sertion of SCA signal(s).

4-4 FM30/FM150/FM300 User’s Manual Processed, pre-emphasized left and right audio is passed through third-order lowpass filters comprised of U202A (203A) and associated circuitry. The filters decrease the level of audio products below 30 Hz. This low-frequency roll off is necessary to prevent disturbance to the phase-lock loop in the RF frequency synthesizer by extremely low-frequency audio components. (See caution at section 2.8.)

U204 is a precision, four-quadrant, analog multiplier. The output of U204 is the product of 38 kHz applied to the Y input and the difference of left and right audio (L-R signal) applied to the X input. The resulting output is a double sideband, suppressed carrier/the L-R subcarrier.

Spectral purity of the stereo subcarrier is dependant on a pure 38-kHz sinewave at the multiplier input.

U207A and Y201 comprise a 7.6-MHz crystal oscillator from which the 19 and 38-kHz sub- carriers are digitally synthesized. U207F is a buffer. The 7.6 MHz is divided by 5 in U208A to provide 1.52 Mhz, used by switched-capacitor filters U5 and U11 in the audio section. 3.8 MHz, 1.9 MHz, and 304 kHz are also derived from dividers in U208. Exclusive-OR gates, U210C and U210D, provide a stepped approximation of a 38-kHz sine wave. With the resistor ratios used, the synthesized sine wave has very little harmonic energy below the 7th harmonic. U210A and B generate the 19-kHz pilot subcarrier. U211 is a dual switched-capacitor filter, configured as second-order, low-pass filters, each one with a Q of 5. The 38 and 19-kHz outputs of pins 1 and 20, respectively, are fairly pure sine waves. Harmonic distortion products are better than 66 dB down-with a THD of less than 0.05%. SEPARATION control R244 sets the 38-kHz level at the Y input of U204.

Resistor matrix R219, R220, R221, and R223 sum the L+R audio with the L-R subcarrier to produce a current at the junction of R221 and R223 that will be converted to composite stereo (less pilot) at the output of summing amplifier U206A. SCA signal is also injected at the input of U206A. 19-kHz pilot is combined with composite stereo in summing amplifier U206B.

Analog switch U205, at the input of U206A, provides switching of left and right audio for stereo and mono modes. In the mono mode, right channel audio is disabled, and the left channel audio is increased from 45% modulation to 100%.

MON L and MON R outputs go to the AF Monitor jacks on the rear panel. R209+R210 (R214+R215) and C207 (C210) is a de-emphasis network. Processed, de-emphasized samples of the left and right audio are used for a studio monitor and for audio testing. Jumpers at HD201 (HD202) allow selection of 50-µsec or 75-µsec de-emphasis.

VR212A and B supply +7 volts and -7 volts, respectively. A 5-volt reference from the audio processor section supplies the subcarrier generators.

For an explanation of on-board adjustments see section 5.2.

Principles of Operation 4-5 4.3 RF Exciter Circuit

This circuit is also known as the Frequency Synthesizer. The Frequency Synthesizer part of the motherboard is no longer a separate module as was the case on older transmitters.The entire component side of the motherboard is a ground plane. Frequency selector switches located on the front panel of the transmitter establish the operating frequency. The VCO (voltage-controlled oscillator) circuitry is inside an aluminum case.

Illustration 6-6 and accompanying schematics can be used as reference in this discussion.

VCO1 operates at the synthesizer output frequency of 87 MHz to 108 MHz. The frequency is controlled by a voltage applied to pin 8 of the VCO. A sample of the RF comes from A2 and is fed to the PLL chip U13. U13 is a phase-locked-loop frequency synthesizer IC. The 10.24 MHz from the crystal oscillator is divided to 10 kHz. Internal programmable dividers divide the 87 - 108 MHz RF to 10 kHz. Differences between the two signals produce error signals at pins 7 and 8 of U14.

Exciter Section

Illustration 4–2 Motherboard (Exciter Section)

Frequency selector switches are read by shift registers U17 and U18. Data from the shift registers is read by U16 which then programs the PLL (Phase Lock Loop) IC U13.

U14B is a differential amplifier and filter for the error signal. Audio that is out of phase with that appearing on the error voltage is introduced by U14A., allowing for greater loop bandwidth with less degradation of the low frequency audio response.

Lock and unlock status signals are available at the outputs of U15E and U15F respectively.

Modulation is introduced to the VCO though R72 and R122.

4-6 FM30/FM150/FM300 User’s Manual 4.5 Metering Circuit

The ALC and metering circuitry is on the motherboard (see Illustration 6–6). This circuit processes information for the RF and DC metering, and produces ALC (RF level-control) bias. It also provides reference and input voltages for the digital panel meter, voltages for remote metering, fan control, and drive for the front-panel fault indicators.

Illustration 6–6 and accompanying schematics complement this discussion.

PA voltage and current come from a metering shunt on the power regulator board. The PAI input is a current proportional to PA current; R153 converts the current to voltage used for metering and control. A voltage divider from the PAV line is used for DC voltage metering.

Metering Section

Illustration 4–3 Metering Circuit

U23A, U23B, and U24A, with their respective diodes, are diode linearity correction circuits. Their DC inputs come from diode detectors in the RF reflectometer in the RF low-pass filter compartment.

U24B, U24C, are components of a DC squaring circuit. Since the DC output voltage of U24C is proportional to RF voltage squared, it is also proportional to RF power.

U22C, U22A, U20A, and U22D are level sensors for RF power, reflected RF power, PA temperature, and external PA current, respectively. When either of these parameters exceeds the limits, the output of U22B will be forced low, reducing the ALC (RF level control) voltage, which, in turn, reduces the PA supply voltage.

The DC voltage set point for U22A (reflected RF voltage) is one-fifth that of U22C (forward RF voltage). This ratio corresponds to an SWR of 1.5:1 [(1+.2)/(1– .2)=1.5]. The U25 invert- ers drive the front panel fault indicators.

Principles of Operation 4-7 4.6 Motherboard

The motherboard is the large board in the upper chassis interconnecting the audio processor/stereo generator board or the optional receiver module or the Omnia digital audio processor to the RF exciter and metering circuits. The motherboard provides the interconnec- tions for this boards, eliminating the need for a wiring harness, and provides input/output filtering. The RF exciter and Metering circuits are an integral part of the motherboard and are no longer separate boards as in past transmitter designs.

Also contained on the motherboard is the +5.00 volt reference and the composite drive Op amp and its associated circuitry.

The motherboard has configuration jumpers associated with different options that can be added at the time of order or at a later time as an upgrade. The motherboard configuration chart for these jumpers can be found on the following page.

Configuration Jumpers

Illustration 4–4 Configuration Jumpers

4-8 FM30/FM150/FM300 User’s Manual Motherboard Jumper Configuration Chart 4.6.1

Jumper FMA “E” FMA“T” FMA“T” FMA “R” FMA FMA 50KΩ input 600Ω input “Omnia” “Omnia” Analog AES input input Z1 Short Short Short Short Short Open Z2 Short Short Short Short Short Open Z3 Open Open Short Open Open Open Z4 Open Open Open Open Open Short Z5 Open Open Short Open Open Open Z6 Open Open Open Open Open Short Z7 Open Open Short Open Open Open Z8 Open Open Short Open Open Open Z9 Short Open Open Open Open Open Z10 Short Open Open Open Open Open Z11 Short Open Open Open Open Open Z12 Short Open Open Open Open Open Z13 Short Open Open Open Open Open Z14 Short Open Open Open Open Open Z15 Open Open Open Open Open Open Z16 Open Open Open Open Open Open Z17 Open Open Open Open Open Open Z18 Open Open Open Open Open Open Z19 Open Open Open Open Open Open Z20 Open Open Open Open Open Open Z21 Open Open Open Open Open Open Z22 Open Open Open Open Open Open Z23 Short Short Short Short Short Short Z24 Short Short Short Short Short Short Z25 Short Short Short Short Short Short Z26 Short Short Short Short Short Short Z27 Short Short Short Short Short Short Z28 Short Short Short Short Short Short Z29 Short Short Short Short Short Short Z30 Short Short Short Short Short Short Z31 Open Open Open Open Open Open Z32 Short Open Open Open Open Open Z33 Short Open Short Open Open Open JMP1 Open Open Open Open Open Open JMP2 Open Open Open Open Open Open

Principles of Operation 4-9 4.7 Display Circuit Board

The front-panel LEDs, the numeric display, the slide switches, and the processing and RF level controls are mounted on the display circuit board. To access the component side of the board, remove the front panel by removing 12 screws. The board contains circuits for the digital panel meter, modulation peak detector, and LED display drivers, as well as indicators and switches mentioned above.

Illustration 6–9 and accompanying schematic complement this discussion.

Left and right audio from input stages of the audio processor board (just after the Input Gain attenuator) go to the L VU and R VU input on the display board. Peak rectifiers U1A and U1B drive the left and right Audio Input displays. The LED driver gives a 3–dB per step display. The lowest step of the display driver is not used; rather a red LOW indicator lights when audio is below the level of the second step. Transistors Q1 and Q2 divert current from the LOW LEDs when any other LED of the display is lit.

Resolution of the linear displays, High Band, Wide Band, and Modulation, has been im- proved using dither enhancement. With dither, the brightness of the LED is controlled by proximity of the input voltage relative to its voltage threshold. The effect is a smooth transi- tion from step to step as input voltage is changed. U6A, U6B, and associated components comprise the dither generator. Dither output is a triangular wave.

Composite stereo (or mono) is full-wave detected by diodes D5 and D6, U7, U13, Q3, and Q4 are components of a peak sample-and-hold circuit.

Oscillator, U9F, supplies a low-frequency square wave to the Fault indicators, causing them to flash on and off.

Digital multimeter inputs are selected with push buttons located to the right of the multimeter menu. Signals from the push buttons are conditioned by U9A and U9B. U10 is an up/down counter. Binary input to U11 from U10 selects a green menu indicator light, and lights the appropriate decimal point on the numeric readout. The binary lines also go to analog data selectors on the ALC/ metering board.

Processing control, R50, is part of the audio processor. (See section 4.2.)

The DPM IN and DPM REF lines are analog and reference voltage inputs to digital multimeter IC U12. They originate from analog data selectors on the ALC/ metering board.

4-10 FM30/FM150/FM300 User’s Manual 4.8 Voltage Regulator Circuit Board

The voltage regulator board is the longer of two boards mounted under the chassis toward the front of the unit. It has switch-mode voltage regulators to provide +12, –12, and 20 volts. It also contains the program detection and automatic carrier control circuits.

Illustration 6–10 and accompanying schematic complement this discussion.

U3E and U3F convert a 38–kHz sine wave from the stereo generator into a synchronization pulse. In the transmitter, synchronization is not used, thus D9 is omitted.

U4 and U5 form a 20–volt switching regulator running at about 35 kHz. U4 is used as a pulse-width modulator; U5 is a high-side driver for MOSFET switch Q1. Supply voltage for the two IC’s (approximately 15.5 volts) comes from linear regulator DZ2/Q5. Bootstrap voltage, provided by D10 and C14, allows the gate voltage of Q1 to swing about 15 volts above the source when Q1 is turned on. Current through the FET is sensed by R38 and R38A. If the voltage between pin 5 and 6 of U05 exceeds 0.23 volts on a current fault, drive to Q1 is turned off. Turn-off happens cycle by cycle. The speed of the turn-off is set by C13.

U6 is a switching regulator for both +12 volts and –12 volts. It runs at about 52 kHz. Energy for –12 volts is taken from inductor L2 during the off portion of the switching cycle. The –12 volts tracks the +12 volts within a few tenths of a volt. There will be no –12 volts until current is drawn from the +12 volts.

Q2, Q3, and Q4 form an active filter and switch, supplying DC voltage to the RF driver, when the Carrier switch is on.

The program detection circuit is made up of U1 and U2. U1A and U1D and associated circuitry discriminate between normal program material and white noise (such as might be present from a studio-transmitter link during program failure) or silence. U1A and surrounding components form a band-pass filter with a Q of 3 tuned to about 5 kHz. U1D is a first-order low-pass filter. Red and green LEDs on the board indicate the presence or absence of program determined by the balance of the detected signals from the two filters. U2 and U1C form a count-down timer. The time between a program fault and shutdown is selected by jumpering pins on header JP1. For times, see section 5.7. The times are proportional to the value of R21 (that is, times can be doubled by doubling the value of R21) and are listed in minutes.

Principles of Operation 4-11 4.9 Power Regulator Circuit Board

The power regulator board is the shorter of two boards mounted under the chassis toward the front of the unit. The board has the isolating diode for the battery input, the switch-mode voltage regulator for the RF power amplifier, and circuitry for PA supply current metering.

Illustration 6–10 and accompanying schematic complement this discussion.

Diode D4, in series with the battery input, together with the AC-supply diode bridge, provides diode OR-ing of the AC and DC supplies.

U1 and U2 form a switching regulator running at about 35 kHz. U1 is used as a pulse-width modulator; U2 is a high-side driver for MOSFET switch Q1. Power for the two IC’s comes from the 20–volt supply voltage for the RF driver (available when the Carrier switch is on). The voltage is controlled at 16 volts by zener diode DZ1. Bootstrap voltage provided by D2 and C9 allows the gate voltage of Q1 to swing about 16 volts above the source when Q1 is turned on. Current through the FET is sensed by R12A and R12B. If the voltage from pin 5 to 6 of U2 exceeds 0.23 volts on a current fault, drive to Q1 is turned off. This happens on a cycle-by-cycle basis. The speed of the turnoff is set by C5.

U3 and Q2 are used in a circuit to convert the current that flows through metering shunt, R19, into a current source at the collector of Q3. Forty milli-volts is developed across R19 for each amp of supply current (.04 ohms x 1 amp). Q3 is biased by U3 to produce the same voltage across R16. The collector current of Q3 is the same (minus base current) as that flowing through R22 resulting in 40 microamperes per amp of shunt current. R5 on the metering board converts Q3 collector current to 0.1 volt per amp of shunt current (.04 ma X 2.49 k). (See section 5.4.)

4.10 RF Driver/Amplifier (FM30)

The RF Driver/Amplifier assembly is mounted on a 100 mm x 100 mm plate in the under side of the chassis.

Illustration 6-14 and accompanying schematic complement this discussion.

The driver amplifies the approximate 20 milliwatts from the frequency synthesizer to 30 watts. An MHW6342T hybrid, high-gain, wideband amplifier, operating at about 20 volts, provides about one watt of drive to a single BLF246 MOSFET amplifier. The BLF245 stage operates from a supply voltage of 28 volts in the FM30. The circuit board has components for input and output coupling and for power supply filtering.

4-12 FM30/FM150/FM300 User’s Manual 4.11 RF Driver (FM150/FM300)

The RF Driver assembly is mounted on a 100 mm x 100 mm plate in the under side of the chassis.

Illustration 6-14 and accompanying schematic complement this discussion.

The driver amplifies the approximate 20 milliwatts from the frequency synthesizer to about 8 watts to drive the RF power amplifier. An MHW6342T hybrid, high-gain, wideband amplifier, operating at about 20 volts, provides about one watt of drive to a single BLF245 MOSFET amplifier. The BLF245 stage operates from a supply voltage of approximately 20 volts.

The circuit board provides for input/output coupling and for power supply filtering.

4.12 RF Amplifier (FM150/FM300)

The RF power amplifier assembly is mounted on back of the chassis with four screws, located behind an outer cover plate. Access the connections to the module by removing the bottom cover of the unit. The RF connections to the amplifier are BNC for the input and output. Power comes into the module through a 5–pin header connection next to the RF input jack.

Illustration 6-12 and accompanying schematic complement this discussion.

The amplifier is built around a ST MicroElectronics SD2942, a dual power MOSFET rated for 50 volts DC and a maximum power of about 350 watts. When biased for class B, the transistor has a power gain of about 20 dB. (It is biased below class B in the transmitter.)

Input transformer, T11, is made up of two printed circuit boards. The four-turn primary board is separated from the one-turn secondary by a thin dielectric film. R12–R17 are for damp- ing. Trim pot R11 sets the bias.

Output transformer, T21, has a one-turn primary on top of the circuit board and a two-turn secondary underneath. Inductors L21 and L22 provide power line filtering.

Principles of Operation 4-13 4.13 Chassis

The AC power supply components, as well as the bridge rectifier and main filter capacitor, are mounted on the chassis. Switching in the power-entry module configures the power transformer for 100, 120, 220, or 240 VAC; see section 2.2 for switching and fuse information. A terminal strip with MOV voltage-surge suppressors and in-rush current limiters is mounted on the chassis between the power entry module and the toroidal power transformer.

The main energy-storage/filter capacitor, C01, is located between the voltage and power regulator boards. The DC voltage across the capacitor will be 45–55 volts (FM30 and FM150) or 65–70 volts (FM300) when the carrier is on.

4.14 RF Output Filter & Reflectometer

The RF low-pass filter/reflectometer are located in the right-hand compartment on the top of the chassis. See Illustration 6–13 and accompanying schematic for more information.

A ninth-order, elliptic, low-pass filter attenuates harmonics generated in the power amplifier. The capacitors for the filter are circuit board pads.

The reflectometer uses printed circuit board traces for micro-strip transmission lines. Trans- mission line segments (with an impedance of about 82 ohms) on either side of a 50–ohm conductor provide sample voltages representative of the square root of forward and reverse power.

DC voltages, representative of forward and reflected power, go through a bulkhead filter board to the motherboard, then to the metering board, where they are processed for power control and metering and for SWR metering and protection.

4-14 FM30/FM150/FM300 User’s Manual 4.15 Receiver Circuit Board Option

This option allows the transmitter to be used as a translator. The receiver board receives terrestrially fed RF signal and converts it to composite audio which is then fed into the exciter board. Microprocessor controlled phase lock loop technology ensures the received frequency will not drift, and multiple IF stages ensure high adjacent channel rejection. Refer to illustrations 4–6, 6–16 and its schematic for the following discussion.

The square shaped metal can located on the left side of the receiver board is the tuner module. The incoming RF signal enters through the BNC connector (top left corner) and is tuned through the tuner module. Input attenuation is possible with the jumper labeled “LO” “DX”, on the top left corner of the receiver board. Very strong signals can be attenuated 20 dB automatically by placing the jumper on the left two pins (“LO” position). An additional 20 dB attenuation is also available with the jumpers in the top left corner of the board. The frequencies are tuned by setting switches SW1 and SW2 (upper right corner). These two switches are read upon power up (or by momentarily shorting J7) by the microprocessor (U4). The microprocessor then tunes the tuner module to the selected frequency. The frequency range is 87.9 Mhz at setting “00” to 107.9 Mhz at setting “64”. Other custom ranges are available.

Located in the lower left-hand corner of the Receiver Module is a 3.5mm headphone jack. Demodulated Left and Right audio is present at this jack. A regular pair of 32 ohm stereo headphones, such as the types used with portable audio devices, can be used to monitor the audio on the receiver module.

Receiver Module

Illustration 4–5 Receiver Module

Principles of Operation 4-15 When a stereo signal is present, LED 3 illuminates which indicates that left and right audio is available. Then the stereo signals go to gain stages and out to the RCA jacks on the back of the cabinet. These can be used for off-air monitoring of the audio signal. Incoming frequency can be monitored from the frequency monitor BNC jack on the back. The stereo buffer, stereo decoder, and gain stages and have no effect on the signal that goes through the transmitter. The power supply is fairly straight forward. The incoming 12 volt supply goes to a 7809, 9 volt regulator (VR1) which supplies all 9–volt needs on the board. The 9 volts also supplies a 7805, 5 volt regulator (VR2) which supplies all 5–volt needs on the board. Plus and minus 12 volts from the motherboard is filtered and supplies various needs on the board. Finally there is a precision reference voltage. Two 2.5 volt reference shunts act very much like a very accurate zener diode to provide a precision 5 volt supply to the metering board.

4-16 FM30/FM150/FM300 User’s Manual Section 5—Adjustments and Tests

This section describes procedures for (1) advanced users who may be interested in customizing or optimizing the performance of the transmitter and (2) service personnel who want to return the transmitter to op- erational status following a maintenance procedure.

Adjustments and Tests 5-1 5.1 Audio Processor Adjustments

5.1.1 Pre-Emphasis Selection

Select the pre-emphasis curve (75 µsec, 50 µsec, 25 µsec, or Flat) by jumpering the appropriate pins of header HD1 on the audio processor/stereo generator board. (See section 2.9.) If you change the pre-emphasis, change the de-emphasis jumpers, HD201 and HD202 on the audio processor/stereo generator board, to match. (See section 2.8.)

5.1.2 Pre-Emphasis Fine Adjustment

Trim potentiometers, R23 and R63, (for left and right channels, respectively) provide for fine adjustment of the pre-emphasis. Set the potentiometers to bring the de-emphasized gain at 10 kHz equal to that of 400 Hz. (At the proper setting, 15.0 kHz will be down about 0.7 dB.)

When making these adjustments, it is important that you keep signal levels below the processor gain-control threshold.

A preferred method is to use a precision de-emphasis network in front of the audio input. Then, use the non-de-emphasized (flat) output from the FM modulation monitor for measurements.

5.2 Stereo Generator Adjustments

5.2.1 Separation

Feed a 400–Hz sine wave into one channel for at least 70% modulation. Observe the clas- sic single-channel composite stereo waveform at TP301 on the RF Exciter circuit board. Ad- just the Separation control R244 for a straight centerline. Since proper adjustment of this control coincides with best stereo separation, use an FM monitor to make or confirm the adjustment.

5-2 FM30/FM150/FM300 User’s Manual 5.2.2 Composite Output

You can make adjustments to the composite output in the following manner:

Using a Modulation Monitor

1. Set the Stereo-Mono switch to Mono.

2. Check that the setting of the Modulation compensation control (see illustration 2–9) on the RF Exciter circuit , falls within the range specified for the frequency of operation. (See section 2.3.1.)

3. Feed a sine wave signal of about 2.5 kHz into the left channel at a level sufficient to put the wideband gain-reduction indicator somewhere in the middle of its range.

4. Set the Composite level control to produce 90% modulation as indicated on an FM monitor.

5. Apply pink noise or program material to the audio inputs and confirm, on both Mono and Stereo, that modulation peaks are between 95% and 100%.

5.2.3 19–kHz Level

Adjust the 19–kHz pilot for 9% modulation as indicated on an FM modulation monitor. (The composite output should be set first, since it follows the 19–kHz Level control.)

5.2.4 19–kHz Phase

1. Apply a 400–Hz audio signal to the left channel for at least 70% modulation.

2. Look at the composite stereo signal at TP301 on the RF Exciter circuit board with an os- cilloscope, expanding the display to view the 19–kHz component on the horizontal centerline.

3. Switch the audio to the right-channel input. When the 19–kHz Phase is properly ad- justed, the amplitude of the 19–kHz will remain constant when switching between left and right.

4. Recheck the separation adjustment as described in section 5.2.1.

5.3 Frequency Synthesizer Adjustments

5.3.1 Frequency (Channel) Selection

Refer to section 2.3.

Adjustments and Tests 5-3 5.3.2 Modulation Compensator

Refer to section 2.3.1

5.3.3 Frequency Measurement and Adjustment

Next to the 10.24–MHz VCXO in the RF Exciter circuit on the motherboard, is a 50K potentiometer (R101). Use R101 to set the frequency of the 10.24–MHz VCXO while observing the output frequency of the synthesizer.

Use one of two methods for checking frequency:

1. Use an FM frequency monitor.

2. Couple a frequency counter of known accuracy to the output of the synthesizer and observe the operating frequency.

5.3.4 FSK Frequency Offset Control

An FSK signal (used for automatic identification of FM repeaters) shifts the frequencies of the 10.24–MHz VCXO reference oscillator and the VCO.

Ground pin 4 on the DB25 connector located on the back panel of the transmitter. This will shift the operating frequency. Adjust R224 for an offset of the operating frequency of about 6 kHz. Un-grounding pin 4 will cause the operating frequency to return to normal.

Use one of two methods for checking frequency:

1. Use an FM frequency monitor.

2. Couple a frequency counter of known accuracy to the output of the synthesizer and observe the operating frequency.

5.4 Metering Adjustments

5.4.1 Power Calibrate

While looking at RF Power on the digital panel meter, set the Power Calibrate trim potentiometer (R215) to agree with an external RF power meter.

5.4.2 Power Set

With the front panel RF Output control fully clockwise, adjust the Power Set trim pot (R55) to 10% more than the rated power (33 W for FM30, 165 W for FM150, 330 W for FM300) as indicated on an accurate external watt meter. If the authorized power is less than the maximum watts, you may use the Power Set to limit the range of the RF Output control.

5-4 FM30/FM150/FM300 User’s Manual 5.4.3 SWR Calibrate

When the Carrier switch is off, or the RF power is less than about 5 watts, the SWR circuit automatically switches to a calibrate-check mode. (See section 4.5 for more information.) Set the digital panel meter to read SWR. With the Carrier switch off, set the SWR CAL trim pot (R66) to read 1.03.

5.4.4 PA Current Limit

Since it may not be practical to increase the PA current to set the PA Current Limit control, you may use this indirect method.

With the carrier turned off, look at the DC voltage at the right end of R186 in the Metering circuit on the motherboard. The current limit, in amperes, will be 0.35 amps higher than ten times this voltage. For example, for a current limit of 7.35 amps, adjust the PA Current Limit control for 0.7 volts at R186 ; or 0.565 volts for 6.0 amps. Set the current limit for 4 amps (FM50), 7 amps (FM150), or 9.5 amps (FM300).

5.5 Motherboard Configuration

See section 4.6.1 for motherboard jumper configuration.

5.6 Display Modulation Calibration

The Modulation Calibrate trim pot sets the sensitivity of the front panel Modulation bar graph display.

This adjustment may be made only after the Output trim pot on the Audio Processor/Stereo Generator board has been set. (See section 5.2.2.)

Set the Stereo-Mono switch to Mono.

Feed a sine wave source of about 2.5 kHz into the left channel at a level sufficient to put the wideband gain-reduction indicator somewhere in the middle of its range.

Set the Modulation Calibrate trim pot so that the “90” light on the front panel Modulation display just begins to light.

Adjustments and Tests 5-5 5.7 Voltage Regulator Adjustments

JP1, a 10–pin header on the Voltage Regulator board, sets the time between program failure and carrier turnoff. Pins 1 and 2 are the two pins closest to the edge of the board. The times are approximate. Sections 2.11, 2.12, and 4.8 contain further information.

1. Short pins 1 and 2 for a 30–second delay.

2. Short pins 3 and 4 for a 2–minute delay.

3. Short pins 5 and 6 for a 4–minute delay.

4. Short pins 7 and 8 for an 8–minute delay.

You may select other times by changing the value of R21. The time is proportional to the re- sistance.

5.8 Bias Set (RF Power Amplifier)

The Bias Set trim pot is located inside the PA module on the input circuit board. Set the trim pot to its midpoint for near-optimum bias.

5-6 FM30/FM150/FM300 User’s Manual 5.9 Performance Verification

Measure the following parameters to receive a comprehensive characterization of transmitter performance:

• Carrier frequency

• RF output power

• RF bandwidth and RF harmonics (see section 5.12)

• Pilot frequency, phase, and modulation percentage

• Audio frequency response

• Audio distortion

• Modulation percentage

• FM and AM noise

• Stereo separation between left and right

• Crosstalk between main channel and subcarrier

• 38–kHz subcarrier suppression

• In addition to the above tests, which pertain to signal quality, a complete check of the unit will include items listed in section 5.21.

5.9.1 Audio Proof-of-Performance Measurements

References to “100%” modulation assume 9% pilot and 91% for the remainder of the composite stereo signal.

Because the audio processing threshold is at 90% modulation, it is not possible to make audio proof-of-performance measurements at 100% modulation through the audio processor. Instead, data is taken at a level below the audio processing threshold at 80% modulation.

5.9.2 De-emphasis Input Network

A precision de-emphasis network, connected between the test oscillator and the audio input of the transmitter, can be very helpful when making the audio measurements. Note that the input impedance of the transmitter or the source impedance of the test oscillator can affect network accuracy. With the de-emphasis network, oscillator level adjustments need only accommodate gain errors, instead of the whole pre-emphasis curve.

Adjustments and Tests 5-7 5.10 Carrier Frequency

Carrier frequency is measured at the output frequency with a frequency monitor or suitable frequency counter.

To adjust frequency, see section 5.3.3. (FCC tolerance +/– 2000 Hz per FCC Part 73.1540 and 73.1545.)

5.11 Output Power

The output power reading on the front panel display should be 90–105% of the actual value. For a more precise measurement, use a watt meter in the RF output line. See sections 5.4.1 and 5.4.2 for setting power.

5.12 RF Bandwidth and RF Harmonics

You can observe RF bandwidth and spurious emissions with an RF spectrum analyzer.

In the Stereo mode, feed a 15.0–kHz audio signal into one channel to provide 85% modulation as indicated on a monitor. Doing so produces 38% main, 38% stereo subcarrier, and 9% pilot per FCC Part 2.1049. As an alternative, use pink noise into one channel.

Using a spectrum analyzer, verify the following (per FCC 73.317):

1. Emissions more than 600 kHz from the carrier are at least 43 + 10log(power, in watts) dB down (58 dB for 30 watts, 65 dB for 150 watts, 68 dB for 300 watts). The scan should include the tenth harmonic.

2. Emissions between 240 kHz and 600 kHz from the carrier are down at least 35 dB.

3. Emissions between 120 kHz and 240 kHz from the carrier are down at least 25 dB.

5.13 Pilot Frequency

The pilot frequency should be within 2 Hz of 19 kHz. (FCC Part 73.322.) Using a frequency counter, measure 1.9 MHz at pin 13 of U208 on the Audio Processor/Stereo Generator board. A 200–Hz error here corresponds to a 2–Hz error at 19 kHz. If the frequency is off by more than 50 Hz, you may change the value of C213. (Changing C213 from 56 pF to 68 pF lowers the 1.9 MHz by about 35 Hz.)

5.14 Audio Frequency Response

For the response tests, take the readings from an FM modulation monitor. Make audio frequency response measurements for left and right channels at frequencies of 50 Hz, 100 Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz. See sections 5.9.1 and 5.9.2.

5-8 FM30/FM150/FM300 User’s Manual 5.15 Audio Distortion

Make distortion measurements from the de-emphasized output of an FM modulation monitor.

Make audio distortion measurements for left and right channels at frequencies of 50 Hz, 100 Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz. See sections 5.9.1 and 5.9.2.

5.16 Modulation Percentage

While feeding an audio signal into the left channel only, confirm that the total modulation percentage remains constant when switching between Mono and Stereo.

Measure modulation percentage with an FM modulation monitor. See section 5.2.2.

19–kHz pilot modulation should be 9%.

5.17 FM and AM Noise

Take noise readings from a de-emphasized output of a modulation monitor.

5.18 Stereo Separation

Make left-into-right and right-into-left stereo separation measurements with an FM modulation monitor for frequencies of 50 Hz, 100 Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz.

5.19 Crosstalk

For stereo crosstalk measurements, both left and right channels are fed at the same time. For best results, there needs to be a means of correcting small imbalances in levels and phase. The balance is made at 400 Hz.

5.19.1 Main Channel Into Sub

Feed the left and right channels in phase with audio (L+R) at 50 Hz, 100 Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz at 100% modulation, while observing the stereo subcarrier (L-R) level on an FM modulation monitor.

5.19.2 Sub Channel Into Main

Feed the audio into the left and right channel as above, with the exception of reversing the polarity of the audio of one channel (L-R input). Using the frequencies of 5.19.1 above, observe the main channel (L+R) level with a modulation monitor.

Adjustments and Tests 5-9 5.20 38–kHz Subcarrier Suppression

With no modulation, but in the Stereo mode, the 38–kHz subcarrier, as indicated on an FM modulation monitor, should be down at least 40 dB.

5.21 Additional Checks

In addition to the tests and adjustments mentioned in this section, the following checks ensure a complete performance appraisal of the transmitter:

1. Perform a physical inspection, looking for visible damage and checking that the chassis hardware and circuit boards are secure.

2. Check the functionality of switches and processing control.

3. Verify that all indicators function.

4. Check the frequency synthesizer lock at 80 MHz and 110 MHz.

5. Measure the AC line current with and without the carrier on.

6. Perform a functional test of the SCA input, Monitor outputs, and the monitor and control function at the 15–pin, D-sub connector.

7. Test the functionality of the FSK circuit.

8. Check the operation and timing of the automatic carrier-off circuitry associated with program failure.

9. Check all metering functions.

10. Test ALC action with PA current overload, SWR, and PLL lock.

NOTE: FCC type acceptance procedures call for testing the carrier frequency over the temperature range of 0–50 degrees centigrade, and at line voltages from 85% to 115% of rating. (See FCC Part 2.1055.)

5-10 FM30/FM150/FM300 User’s Manual Section 6—Reference Drawings

The illustrations in this section may be useful for making adjustments, taking measurements, troubleshooting, or understanding the circuitry of your transmitter.

Reference Drawings 6-1 6.1 Views

Gain Digital Multimeter Fault Indicators Carrier Switch Reduction/Expansion Indicators Multimeter Select Modulation Indicators

Stereo/Mono Switch Power Switch Audio Processor Processing Control Input Level Indicators Input Gain Frequency Selector RF Output Switches Switches Control Illustration 6-1 Front View

RF Output Receiver Input Composite Input Audio Inputs (Optional)

RF Output Monitor SCA Inputs Audio Monitors

AC Power Input RF Power Amplifier Remote I/O DC Input (FM150/300 Only)

Circuit Breaker

Illustration 6-2 Rear View

6-2 FM30/FM150/FM300 User’s Manual Metering Circuit Audio Processor Section

RF Low Pass Filter & Reflectometer Stereo Generator Section RF Exciter Circuit

DC Input

RF output

Power Amplifier (FM150/M300 Only) Illustration 6-3 Chassis Top View

Voltage Regulator Power Regulator

RF Pre-driver/ Amplifier

Filter Capacitor

AC Power Transformer Bridge Rectifier

AC Power Entry

Illustration 6-4 Chassis Bottom View

Adjustments and Tests 6-3 Notes:

6-4 FM30/FM150/FM300 User’s Manual 6.2 Board Layout and Schematics

Illustration 6-5 Audio Processor/Stereo Generator Board

FM30/FM150/FM300 User’s Manual 6-5 Board Layouts and Schematics

DWG. NO. REV. 1 2 3 4 5 6 7 8 9 10 11 12 5 6 REVISION HISTORY APPROVALS E . C . N. REV DESCRIPTION DATE DWN CHK CM PE GAIN R9-14 TURKEY SPECIFICATIONS: ------(INTO 600 ohms) 0dB OPEN Baseband: +6dB 50.5K dbm V-rms V-peak 30Hz - 53KHz +/- 0.2dB. +12dB 16.8K -10 .245 .346 53KHz - 76KHz +/- 0.4dB. H +18dB 7.21K 0 .774 1.1 H +10 2.45 3.46 40Hz - 15KHz +/- 0.5dB 40H 7 5KH 0 5% THD C5 15.2 KHz LOW-PASS FILTER L VU (8th ORDER ELLIPTICAL) 22pF C8 C1 R15 U5 R1 +12V +12V L IN2 U3 7 7 49.9K 1 14 1K THAT2180 INV C R(h I) 33pF C3 R2 1uF 2 4 2 13 Vin COMP2* R29 100pF 49.9K 1 V+ -12V RG1 6 R11 1 8 2 U4A 3 12 +VT U2 IN OUT R18 AGND V- 8 1 24.9K RG2 3 AD622 10.0K 3 100K 4 11 C6

EC+ EC- SYM V- GND V+ fCLK

5 TL072 D5 C2 5 10 4 -12V R3 L SAMPLE R16 AGND NC 1uF 1N4148 2 3 4 5 6 L IN1 4 8 +12V D1 24.9K 6 9 R22 2 U7A 1K 1N6263 COMP1* Vout R37 C4 R4 -12V 1 LEFT 1uF 7 8 C6A 24.9K 3 INV A NC C7 100pF 49.9K +12V TL072 499 R7 R12 D2 .0027uF R19 1uF D6 C9 G 1N6263 POLY (C8687-3) 8 +12V R35 D1 G 49.9 2.00K OPEN LTC1064-1 U6 7 1N4148 2200pF R6 R13 R14 R17 THAT2180 24.9K 1N6263 49.9 5.1K R21 POLY 49.9 24.9K 300 V+ -VT R5 1 8 IN OUT D1 -12V 6 U4B Q1 49.9 7 2N5087 1N6263 EC+ EC- SYM V- GND 5 +5V R36 U1 TL072 2 3 4 5 6 12 24.9K 0X 13 14 +7V -7V X 1X R24 15 R23 6 U7B 2X 11 10K 7 3X 30K 5 +5V 1 TL072 0Y 3 5 Y 1Y C29

2 + C28 2Y R20 + 4 DS1 DS2 10uF -5V 3Y 1K R25 R26 10uF 1N5818 1N5818 TANT R27 10 49.9 5.1K A TANT 9 R38 R39 B C10 1.0K 6 0.1uF -12V 47K 47K INH R28 1.0K 74HC4052 +5V /+12DB HD1 F /+6DB FLAT F 1 2 R70 50uS 3 4 R10 5 6 R45 1.52MHz 5.62K 75uS 7 8 49.9 510 9 10 R46 R68 HEADER 5X2 49.9 1.0K R47 R67 49.9 C15 1.0K

22pF R SAMPLE C18 C11 +12V +12V R15 U11 R IN2 R41 7 U9 7 49.9K 1 14 LEFT 1K THAT2180 INV C R(h I) 33pF LEFT C13 R42 1uF 2 4 2 13 Vin COMP2* R69 100pF 49.9K 1 V+ -12V RIGHT RG1 RIGHT 6 R51 1 8 2 U10A 3 12 +VT IN OUT R58 AGND V- 8 U8 1 24.9K RG2 3 AD622 10.0K 3 100K 4 11 C16

EC+ EC- SYM V- GND V+ fCLK

5 TL072 1.52MHz D11 CLOCK C12 5 10 4 -12V E R43 R56 AGND NC 1uF 1N4148 E 2 3 4 5 6 R IN1 4 8 +12V D7 24.9K 6 9 R62 2 U13A 1K 1N6263 COMP1* Vout R77 +12V +12V C14 R44 -12V 1 RIGHT 1uF 7 8 C16A 24.9K 3 INV A NC C17 -12V -12V 100pF 49.9K +12V TL072 499 R52 D8 .0027uF R59 1uF D12 C19 +7V +7V 1N6263 POLY (C8687-3) 8 +12V R75 D9 2.00K OPEN LTC1064-1 U12 7 1N4148 2200pF R54 R57 THAT2180 24.9K 1N6263 -7V -7V 5.1K R61 POLY R VU 24.9K 300 V+ -VT VDD 1 8 IN OUT D10 -12V 6 U10B Q2 +5.00V +5V +5V C30 D29 7 2N5087 1N6263

R88 EC+ EC- SYM V- GND 5 R76 10K TL072 1uF R85 1N4148 .006V/DB 2 3 4 5 6 24.9K -5V -5V -5V D28 5.1K R53 +5V 49.9 6 U13B VEE HEAVY 7 1N4148 R86 5 DL1 PROC A R64 TL072 100K RED C21 R60 R63 +VT +VT D25 R84 3.3K (J3-16) R118 R82 .047uF 10K 30K 3.3K -VT -VT L SAMPLE STEREO R65 R66 10M R96 R97 PROC B TO R50 ON D 100K R87 POLARITY 49.9 5.1K D 1N4148 (J3-18) DISPLAY BD. 10K ERROR ZERO 10M C24 GND R80 GND POLY D13 -5V R119 30K D26 R98 -12V U14B PROC C 24.9K 6 C20 (J3-20) .01uF 7 330K 1N4148 POLY 1N6123 5 LIGHT R81 TL072 100pF R99 C25 R120 30K D27

R83 4 3.3M OPEN R SAMPLE -12V OPEN 100K U14A 1N4148 2 C22 C26 1 R79 /STEREO FAULT 3 LEFT-RIGHT PHASING DETECTOR TL072 10K R91 R92 R113 R114 D14 100pF 100pF 49.9K 49.9K 49.9K 49.9K RIGHT LEVEL REDUCED 6dB 8 +12V D17

DURING POLARITY ERROR. 4 1N4148 -12V 1N4148 R90 U15A 2 R100 4 -12V BR GR 1 U15B 6 D16 3 R94 7 U16A 2 U16B 100 TL072 10M R112 0.25V/DB R121 49.9K 5 HI GR 1 R116 6 +12V C23 100 3 7 1M

8 -VT 5 TL072 1uF SHORT TL072 49.9K C TL072 C

8 +12V R115 +12V D21 D22 +12V C27 R89 R103 R95 49.9K 1uF 3.0K R101 R102 C40 C42 C44 100K 1N4148 1N4148 240K 1uF 1uF 1uF R93 1.0K 10.0K R117 R122 R123 49.9K -VT 560 1.0K 10.0K C41 C43 C45 1uF 1uF 1uF -12V -12V

+VT

R127 +12V R107 U18 4.7K 4 -12V 49.9K REF02 TEST SW1 2 U17A 1 8 4 -12V D23 1 R106 6 U17B NC NC 3 C32 +5.00V R104 3 7 VCC 2 -VT 2 7 2 U19A .01uF 49.9K 5 +12V Vin NC 1 NE5532 1 R128 +5V 5.1K J1 J3 +5V 1N4148 NE5532

3 6 3 8 L IN1 +12V NC Vout NORMAL SIP3 1 2 1 2 B 100 C33 C34 C35 +12V L IN2 -12V B NE5532 3 4 3 4 4 5 1uF 1uF 1uF D24 R IN1 /+6DB GND TRIM 5 6 5 6

8 +12V R IN2 /+12DB +5V 7 8 7 8 L VU 9 10 9 10 R126 R VU 1N4148 11 12 11 12 10K +5.00V R105 13 14 13 14 R129 PROC A VSS 15 16 15 16 10K PROC B 17 18 17 18 10.0K PROC C 19 20 19 20 C36 BR GR 21 22 6 U19B .01uF HI GR 23 24 7 R130 RECEPT 10X2 /STEREO FAULT -5V 25 26 5 100 NE5532 C37 C38 RECEPT 13X2 Copyright (c) 2007 HCJB Global 1uF 1uF

+/- 12V FOR OP-AMPS AND VCA'S. +/- 7V AT 56mA FOR LTC 1064-1 AND LMF100. IREC +/- 5V FOR LOGIC (+5V TAKEN FROM +5.00V BUS APPROVALS INTERNATIONAL RADIO AND ELECTRONICS CORP. DWN DW 03-15-07 25166 LEER DRIVE ELKHART, IN. 46514 +5.00V REFERENCE VOLTAGE. ALSO USED BY D CHK 574-262-8900 A TITLE: A +/- 4.4 FOR PEAK LEVEL THRESHOLD REFERENC CM DW 03-15-07 AUDIO PROCESSOR/STEREO GENERATOR UNCONTROLLED THESE DRAWINGS AND SPECIFICATIONS ARE THE PE DP 03-15-07 UNLESS OTHERWISE MARKED IN RED INK BY CM AS A PROPERTY OF INTERNATIONAL RADIO AND ELECTRONICS CORP. SIZE DWG . NO . WWW.IREC1.COM REV CONTROLLED COPY, COPIES OF THESE DOCUMENTS AND SHALL NOT BE REPRODUCED, COPIED OR USED AS DISTRIBUTION INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR D 201409F-SCH C ARE FOR REFERENCE ONLY. DEVICES WITHOUT PERMISSION. K FILENAME: SCALE : NONE PROJ NO. SHEET12 OF

1 2 3 4 5 6 7 8 9 10 11 12

Schematic Diagram: Audio Processor/ Stereo Generator (Sheet 1 of 2)

6-6 Adjustments and Tests FM30/150/300 User’s Manual DWG. NO. REV. 1 2 3 4 5 6 7 8 9 5 10 6 11 12

H C204 H R217 SCA IN 0 C203 OPEN 100pF R230 R203 0 1K +12V EXT IN- 7 Composite Spec. (Turkey): C202 R204 2 30Hz - 53KHz +/- 0.2 dBr 100pF 49.9K 1 U201 RG1 R206 53KHz - 76KHz +/- 0.4dBr EXTERNAL COMPOSITE 6 8 RG2 INPUT 3 AD622 3.9K R205 R201 OPEN 5 1K EXT IN+ 4 C201 R202 -12V 100pF 49.9K

G G D201 D202

R207 1N4148 1N4148 D203 D204 150K LEFT LEFT

4 -12V 1N4148 1N4148 R224 RIGHT RIGHT 6 U202B 2 7 R211 MON L D205 D206 1K U202A R209 R210 C205 C206 1 5 R225 LEFT 3 100 4.99K 2.49K TL072 CLOCK 1.52MHz TL072 1N4148 1N4148 12.4K .047uF .047uF +12V POLY POLY R208 8 +12V +12V 300K

HD201 1 2 3 C207

-12V -12V .01uF 4 SIP3 U205 -12V POLY R218 12 +7V +7V 14 0X 13 2 U206A 50 75 9.09K 1% 1X X -7V -7V 15 2X 1 11 3X 3 F LEFT 8VPP (AT 2000Hz) R219 R221 1 MC34083 F VDD 5 0Y 3 1Y Y 8 +5.00V 10.0K 4.99K 2 +12V +5V +5V RIGHT 8VPP (AT 2000Hz) R220 4 2Y C212 3Y R212 10.0K R222 10 9 A J201 150K 200K B R234 -5V -5V -5V C211 120pF 1 +12V 6 1K -7V +7V EXT IN+

4 56pF INH 2 VEE -12V U204 3 EXT IN- 6 U203B 74HC4052 4 SCA IN 2 7 R216 MON R COMP OUT C208 U203A R214 R215 5 +VT +VT C209 1 5 1 X1 V+ 14 D207 D208 C227 C228 6 COMP METER RIGHT 3 100 MONO/STEREO 4.99K 2.49K TL072 -5V +5V 1uF 1uF 7 -VT -VT TL072 2 X2 DD 13 8 /EXT ENABLE 1N4148 1N4148 GND .047uF .047uF +12V 3 12 R223 9 POLY POLY R213 8 U0 OUT 10 11 GND 300K HD202 4 11 9.09K GND 1 2 3 C210 U1 Z1 12 SIP3 .01uF 5 10 POLY U2 Z2 12 HEADER 6 9 50 75 Y1 REF R226 7 Y2 V- 8 R227 1K 43K E AD734 COMPOSITE OUTPUT E J202 1 +12V R228 2 MON L 3K 3 MON R

8 4 U204A 5 GND 1 6 2 X1 7 X2 V+ 7 8 R236 OUT C224 9 3 Y1 10 +5.00V 4 6 SYNC OUT

1K Y2 V- Z 11 R254 12 R237 R254 used ONLY with AD633 22pF

49.9K 5 AD633JN 1M AD734 has internal 50K 12 HEADER Y201 U207A U207F R231 1 2 13 12 -12V R232 U210D AD633 ALTERNATE TO AD 734 20K COMP OUT MC74HC04 MC74HC04 13 7.6 MHz C214 11 R240 SEPARATION R229 6 U206B 100 C213 C215 12 7 5.5-18pF 24K 56pF 33pF C216 24K 5 NPO NPO 74HC86 MC34083 D R245 R233 COMP METER D U210C 0.1uF R244 13K 100 9 5K 8 R241 +7V 10 10K C218 R252 R253 74HC86 R246 10.0K R247 49.9K U208A 1K 1K 2 1CLR 1QA 3 3.8MHz 0.1uF 1 5 C219 C219 10 4 8 7 5 6 3 1CKA1QB 9 2 1 4 1CKB1QC 6 1.52MHz 1000pF 1000pF 1QD 7 POLY POLY 74HC390 R264 R261 LSH BPA LPA VD+ VA+ S1 A HPA SA/B U211 +7V -7V INV A CLK A LMF100 10K 10K +5V +12V R262 CLK B 50/100 VD- VA- AGND S1 B INV B HPB BPB LPB C224 C226 4 10 R238 .001 -12V .001 R260 10K 11 12 13 14 15 16 17 18 19 20 6 U212B 2 U212A U208B 7 Q202 1 Q201 U207C 14 2CLR 2QA 13 1.9MHz C221 +5V 5 MPS-A06 10.0K 3 MPS-A56 R255 R256 R257 TL072 TL072 C /EXT ENABLE 5 6 15 11 C 12 2CKA2QB 10 12 11 U210B 1K 1K 43K +12V 2CKB2QC CLR QA 0.1uF 19KHz Level R263 R265 8 MC74HC04 2QD 9 304KHz 13 CKA QB 10 5 9 6 R242 C222 C223 R258 24.9K QC 8 4 -7V 1000pF 1000pF 10 -12V QD 120K 1K 74HC390 R250 10.0K R251 49.9K 74HC86 C216 POLY POLY U209B 74HC393 U210A 1 0.1uF 3 R243 R259 2 3K U207B 49.9K MONO/STEREO 3 4 74HC86 MC74HC04 R239 10K U207E J203 U209A R266 10 9 11 10 38KHz 8 7 -12V 6 5 -12V 2 3 MC74HC04 OPEN +12V +12V 1 CLR QA 4 4 3 CKA QB 5 2 1 QC 6 B QD RECEPT 5X2 B U207D DZ1 DZ2 74HC393 9 8 R267 19KHz SYNC OUT ICTE-15 ICTE-15 MC74HC04 1K

A TITLE: A Copyright 2006 Michael P. Axman AUDIO PROCESSOR/STEREO GENERATOR UNCONTROLLED THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF INTERNATIONAL RADIO AND ELECTRONICS CORP. SIZE DWG . NO . REV UNLESS OTHERWISE MARKED IN RED INK BY CM AS A AND SHALL NOT BE REPRODUCED, COPIED OR USED AS CONTROLLED COPY, COPIES OF THESE DOCUMENTS THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR B 201409F-SCH C INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS DEVICES WITHOUT PERMISSION. ARE FOR REFERENCE ONLY. SCALE : NONE PROJ NO. SHEET2 OF 2 1 2 3 4 5 6 7 8 9 10 11 12

Schematic Diagram: Audio Processor/ Stereo Generator (Sheet 2 of 2)

FM30/FM150/FM300 User’s Manual 6-7 Board Layouts and Schematics

Illustration 6-6 Motherboard

6-8 Adjustments and Tests FM30/150/300 User’s Manual DWG. NO. REV. 1 2 3 201207F-SCH4 A 5 6 7 8 9 10 11 12 5 6

+12V REVISION HISTORY APPROVALS J16 FAN 201497F-SCH-SH3.SCH E . C . N. REV DESCRIPTION DATE DWN CHK CM PE FAN- 1 201497F-SCH-SH2.SCH 2 A PRODUCTION RELEASE 03-08-07 DW DW DP +12V 3 HEADER 3 ALC/METERING AUDIO PROCESSOR SHUNT R40 H RF EXCITER 4.7K H +12V J14 RF_LVL C27 1 C29 U2 .01 +5.00V 2 +12V 1 8 1.0 3 C26 NC NC 4 Z9 2 7 2 TL072 5 Vin NC R39 6 1 3 6 3 U3A HEADER 6X1 .156 1.0 TEMP Vout 100 OPEN

ALC C30 C55 C56 C57 C54 GND C28 +5.00V 4 5 PAI METER BATT PAV RFV FAN

GND GND TRM -12V ALC Q3 -12V V-METER FM_/LOCK -12V +12V TEMP +12V LOCK INPUT METER PAIMETER /LOCK METER PATEMPMETER SUPPLY DC FSK IN METER PAVMETER EXT ALC CONTROL

1.0 FAULT SUM RF REV METER RFW METER

RF_LVL 1.0 RF FWD RF OUT RF COMPOSITE1

/LOCK FAULT /LOCK 1.0 .01 .01 .01 LOC/REMOTE WR TP1 IRF541 REF02 ANTENNA SWR +12V J26 HEADER 5 x 2 R216 +12V J18 J19 FM TP1 -12V +12V 1 2 3 4 5 6 7 8 9 10 MCX MCX VOLTMETER 1K +5.00V -12V C140 6 TL072 J25 7 .01 5 U3B 1 2 3 -12V HEADER 3X1 FAULT /LOCK DC SUPPLY PAI PAV TEMP FAN V-METER RFV FWD RF REV RF INPUT FSK IN LOCK /LOCK RF_LVL LOC/REMOTE FM_/LOCK ALC METER PAV METER PAI METER RFW METER PATEMP METER BATT FAULT SUM

J25 CONTROL ALC EXT G R150 1K G 1 ALC 2 R176 1K 3 RF OUT 4 R177 1K

5 COMPOSITE1 E2 6 FM_/LOCK 7 E3 8 ALC 9 E4 10 HEADER 5 x 2 +12V WR J13 FM J28 V+ 1 1 V+ TEMP J9 TEMP 2 2 TEMP GND 3 3 GND 1 1 NC 2 2 HEADER 3X1 HEADER 3X1 RF_LVL 3 3 4 4 PAI C159 1 5 5 PAV FSK IN NC 2 .001 6 6 7 7 J2 3 N/C +5.00V +12V 4 N/C C158 8 8 /LOCK FAULT 9 9 5 .001 NC 6 10 10 DC SUPPLY J10 J12 F 7 F 38KHZ HEADER 5 x 2 1 1 1 8 C157 +12V 9 N/C 2 2 2 /CARR_OFF .001 J29 10 3 3 3 TEMP -12V WR 11 4 4 4 /AUTO_CARR_OFF 12 5 5 5 INPUT J11 /+6DB 13 6 6 6 1 1 7 7 7 14 N/C L IN1 /+12DB 15 N/C 2 2 8 8 8 METER PAIMETER RFW METER PATEMPMETER BATT METER SUM FAULT N/C ALC PAVMETER 3 3 9 9 9 16 L IN2 L VU N/C 4 4 10 10 10 17 INPUT 5 5 11 11 11 18 N/C R IN1 R VU N/C 6 6 12 12 12 19 TEMP ALC 7 7 13 13 13 20 R IN2 J3 +5.00V 8 8 14 14 14 /LOCK FAULT 9 9 15 15 15 PROC A 10 10 16 16 16 PAI J1 1 11 11 17 17 17 PAV LPIN L PROC B 2 12 12 18 18 18 3 13 13 19 19 19 NC LPOUT L PROC C 4 NC 14 14 20 20 20 5 15 15 21 21 LPIN R BR GR 6 16 16 22 22 HEADER 10 x 2 DC SUPPLY

7 R IN1 17 17 23 23 38KHZ LPOUT R HI GR 8 18 18 24 24 J15 9 NC 19 19 25 25 /CARR_OFF NC NC FM 10 Z23 20 20 26 26 Z31 Z32 11 /AUTO_CARR_OFF C16 E 12 HEADER 10 x 2 HEADER 13 x 2 E 13 JUMPER .01 OPEN OPEN -12V 14 NC Z24 INSTALLED WHEN USING 15 NC C17 AUDIO PROC. SHUNT CKT. 16 17 NC JUMPER .01 18 Z25 COMP METER 19 NC ALC C18 AUDIO PROCESSOR 20 FMV CONTROL JUMPER .01 Z26 STEREO GENERATOR STEREO/MON C19 C66 JUMPER .01 +12V OPEN Z27 C67 C20 OPEN JUMPER .01 TP4 C68 Z28 +12V OPEN C21 JUMPER .01 C65 TP3 .01 Z29 C22 +5.00V -12V C64 JUMPER .01 J7

.01 COMPOSITE1 1 1 Z30 MON L 2 2 D C23 MON R -12V D 3 3 JUMPER .01 NC 4 4 5 5 C62 LPIN L +5.00V 6 6 LPOUT L .01 7 7 J2 LPIN R 8 8 C60 LPOUT R +12V 9 9 TP5 .01 10 10 38KHZ 38KHZ J8 C58 11 11 +5.00V 12 12 1 1 COMP METER .01 2 2 HEADER 12 3 3 +5V C59 /EXT ENABLE /EXT ENABLE 4 4 .01 5 5 TP6 J3 6 6 C63 38KHZ +5V 7 7 .001 8 8 C61 9 9 .001 10 10 TP7 Z22Z21 OPEN Z20 OPEN Z19 OPEN Z18 OPEN Z17 OPEN Z16 OPEN Z15 OPEN OPEN HEADER 5 x 2 GND

-12V ALC J6

R28 220 R27 220 R26 220 R25 220 R24 220 R23 220 R22 220 R21 220 1 1 D1 2 2 C J3 3 3 C 1N4148 4 4 13 5 5

L IN1 6 6

25 L IN2 R IN2 7 7 J1 8 8 INPUT CONFIGURATION CHART 12 9 9 EXT IN EXT RTN IN SCA 10 10 NON-OMNIA BOARD INPUT IMPEDENCE OMNIA BOARD AES/EBU INPUT 24 RDS TX 11 11 12 12 11 50 KOHM 600 OHM Z1, Z2 OFF REM SWR HEADER 12 Z3, Z5, Z7, Z8 OFF 23 RDS RX Z1, Z2 ON Z1, Z2 ON Z3, Z5, Z7, Z8 OFF Z3, Z5, Z7, Z8 ON Z4, Z6 ON COMPOSITE1 METER COMP 10 COMP METER STEREO/MON Z4, Z6 OFF Z4, Z6 OFF REM LOWER ANALOG LEFT/RIGHT 22 LEFT IN 1 LEFT IN 2 REM PWR CNTRL 9 REM RAISE 21 Z6 OPEN R4 R6 C11 Z13 8 -METER PAV L IN1 R IN1 220pF STEREO GENERATOR SHUNT R31 1K 20 -METER PAI 1K OPEN Z4 OPEN C12 100 7 -METER RFW R2 R8 220pF Z12 L IN2 R33 NOTES: B 19 -METER PA TEMP B 1K 1K C13 OPEN UNLESS OTHERWISE SPECIFIED:

R IN2 100 6 -METER BATT 220pF Z14 1. ALL RESISTORS ARE IN OHMS, 1/4W, 5% TOL. 18 -FAULT SUM C3 C4 R38 1K Z1 Z2 C14 SCA IN 2. ALL CAPACITORS ARE IN MICROFARADS. JUMPER JUMPER 220pF 220pF 5 -/AUTO_CARR_OFF 220pF OPEN D3 D2 17 -/CARR OFF C1 C2 Z11 C15 R14 220 220pF 220pF R32 R34 24.9K 1% 1N4148 4 _FSK IN FSK IN 220pF EXT RTN R29 OPEN 1K R37 R13 100 Z5 Z7 24.9K 1N4148 16 _ALC R3 R5 R15 R16 R17 R18 R20 1% C24 R12 390 1K 1K 1K 1K 1K +12V 1.0 4.02K 3 -COMPOSITE OUT COMPOSITE METER OPEN 300 300 OPEN 1% 15 38 KHZ OUT R11 390 38KHZ 2 TL072 Z3 Z8 Z10 1 R30 6 TL072 R10 1K R1 R7 R19 R35 U1A 2 -FMV CONTROL FMV CONTROL FMV CONTROL EXT IN 3 3.9K U1B 7 OPEN OPEN 24.9K C25 5 14 _/EXT ENABLE R9 220 /EXT ENABLE 300 300 OPEN 240 1% -12V 1.0 1 +12V R36 IREC APPROVALS

MON_R MON_L EXT_IN EXT_RTN SCA 24.9K INTERNATIONAL RADIO AND ELECTRONICS CORP. C5 C6 C7 C8 C9 C10 DB25_2X 1% DW 10-05-06 1K DWN 25166 LEER DRIVE ELKHART, IN. 46514 R222 .01 .001 .001 .001 .01 .01 574-262-8900 J2 CHK A J1 3 2 1 1 2 3 HD6 1 2 3 4 5 A OPEN TITLE: XLR HI OPEN CM DW 10-05-06 2 SCH, UNIVERSAL MOTHER BOARD LO 3 UNCONTROLLED THESE DRAWINGS AND SPECIFICATIONS ARE THE PE DP 10-05-06

9 8 7 6 5 4 3 2 1 J24 GND 10 1 UNLESS OTHERWISE MARKED IN RED INK BY CM AS A PROPERTY OF INTERNATIONAL RADIO AND ELECTRONICS CORP. SIZE DWG . NO . WWW.IREC1.COM REV CONTROLLED COPY, COPIES OF THESE DOCUMENTS AND SHALL NOT BE REPRODUCED, COPIED OR USED AS DISTRIBUTION 201497F-SCH REF. FOR INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR D A HEADER 5 x 2 XLR CON. ARE FOR REFERENCE ONLY. DEVICES WITHOUT PERMISSION. K FILENAME: SCALE : NONE PROJ NO. SHEET1 OF

1 2 3 4 5 6 7 8 9 10 11 12 Schematic Diagram: Motherboard (Sheet 1 of 3)

FM30/FM150/FM300 User’s Manual 6-9 Board Layouts and Schematics

12 345 6DWG. NO. 201497F-SCHREV. A 8 9 10 11 12

1.00V = 10VDC METER PAV 1.00V = 10.0A METER PAI

R143 R145 H J1-4 PAV 100 100 +5.00V H C119 EXT ALC CONTROL J22-5 .01 R161 R142 2 100K R194 PAI LIMIT +5V 1 100 1% U19A 15K U25D R196 10K 3 D47 1N4148 C127 + + C125 9 8 SWR LAMP TL072 J30-20 47/20V 47/20V R186 R162 33K 74HC14 R195 10.0K D44 D29 1% R144 10K C154 6 100 .001 +5V 1N4148 7 R187 U19B 2.2M D32 U25F J2-3 PAI 5 13 1N4148 14 1N4148 13 12 PADC LAMP TL072 U22D J30-14 C118 R153 12 R193 .01 2.49K TL074 100K 74HC14 U25E 1% D43 R175 120K 11 10 FAULT SUM J23-8 R163 1.1K U25A 74HC14 FAULT SUM G 1% R164 C132 1N4148 G 11 -12V 1M .001 1 2 PATEMP LAMP J30-12 D30 +5.00V 1N4148 R182 2 74HC14 C142 80.6K 1% U20A 1 50mv per degree C. 3 R190 +5V J30 .001 SEL A R221 TL074 100K 2 1 SEL B 10.0K D46 4 3 1%

4 +12V SEL C R183 R165 R169 R154 120K 6 5 R220 RF_LVL 240K 10K C141 FM U5 8 7 100K R166 10K +5.00V R171 100K -12V 1.0 10 9 220K U25B PATEMP LAMP 1N4148 12 11 13 FM_/LOCK 3 4 LOCK LAMP PADC LAMP 1% FM_/LOCK J30-18 14 13 14 R141 100K FAN INPUT LAMP

U20D J2-7 16 15 1.00V R167 12 D42 LOCK LAMP DPM REF 74HC14 18 17 9 -12V /LOCK FAULT SWR LAMP DPM IN R136 R149 100 1% 30.1K 1% J23-1 J22-1 20 19 8 METER PATEMP TL074 D45 TEMP OUT 1K 10 U20C J4-6 R157 C152 J2-6 -12V 1N4148 /LOCK FAULT HEADER 10X2 R212 5.00V = 100 deg. C 11 1M .001 TL074 R181 D31 U25C 2.49K C120 METER PATEMP 1N4148 240K 2 1N4148 INPUT 5 6 INPUT LAMP 1% 0.1 10mV/Deg. C INPUT J30-16 F U22A 1 F R170 3 R152 74HC14 24.9K R158 R160 TL074 100K J22-12 D40 1% 100K 68.1K 1% 4 R151 120K D41 POWER SET C153 POWER SET 1N4148 0.1 1N4148 +12V R218 10K R159 R55 M1/M2 * 10K R188 R219 33K C155 R217 100K DC SUPPLY R159 = 19.6K 1% POWER SET R189 51K J1-2 1M 0.1 R191 ALL FM 9 51K R184 8 6 DC SUPPLY R135 R159 = 187K 1% 1K 10 U22C 7 ALC 100K R192 U22B ALC D33 5 1% R146 WR TL074 R185 3.16K 1N4148 200K TL074 R156 6 100 R159 = 200K 1% 1% 100K U20B 7 METER BATT 1% 5 J2-7 E -12V E TL074 1 2 3 R155 11K C117 METER BATT 1% 0.1 +5V SW10 SWITCH FULL SCALE U21 R173 ALL OTHERS LADRVR .001V per Watt RF POWER (RFV SQUARED) RF POWER 1999 WATTS 13 16 (1.999V reads "1999") R174 X0 VCC 10K SWR 19.99 14 1.1K X1 1% ALC 19.99V 15 3 DPM IN X2 X J30-19 1% 10mV/Volt PA DCV 199.9V 12 X3 100mV/Amp PA DCI 19.99A 1 C160 X4 1mV/Degree C PA TEMPERATURE 199.9 Deg. C 5 0.1 X5 10mV/Volt SUPPLY DC VOLTS 199.9V 2 X6 VOLTMETER 10mV/Volt VOLTMETER 4 J2-8 199.9V X7 R137 C121 6 R168 INH 100K 0.1 +5V SEL A 11 1K A 1% J3-2 SEL B 10 B 1% R178 1K +5V C32 J3-4 SEL C 9 C +5.00V J3-6

11 -12V 8 GND R64 10K RAISEREM D C45 R43 .01 U5 D REM PWR CNTL PWR REM 2 C50 C44 R140 +12V 51.1K 74HC4051 1 R68 .01 R57 1 8 R49 10K U23A 1% INC Vcc 1K RF REV 3 R197 .01 1 J2-11 .01 10K -12V 3.32K Q1 3 2 7 TL074 100K 4 U4A U/D CS C124 2 1% 2 C129 R63 1 8 C42

4 +12V D35 1 2 3 6 .01 .001 2 7 H L R48 3 U10A 1 74HC132 6 TL074 .001 1N6263 TL072 10K U9A 3 6 1K 8 R60 3 SW1 4 5 7 C48 4 5 SW-PB GND W U8B +12V 10K MC33282 5 R198 LM394 C41 D12 R61 DS1804 22K -5V R179 .01 +5V .001 D11 C40 1N4148 49.9K Q2 1K 1% +12V R58 1 8 SW2 10K 2 7 SW-PB R44 1N753A .01 C47 4 3 6 51.1K 6.2V C35 C43 R62 6 .01 6 TL074 R59 4 5 SWR REM U4B .001 R139 6 10K U9B 7 5 -12V 7 5 LM394 9 TL074 10K U23B 3.32K 74HC132 .01 J2-10 RF FWD 5 MC33282 1% U8C 8 C C131 R200 +5V 10 C C123 .001 D36 100K 3 1 C46 D13 9 .01 1N6263 Q5 R65 R67 R47 1N4148 2N5210 -12V R206 R66 100 8 12 5.11K 10 U4C 11 39K SWR CAL 1% 51.1K U4D D34 .01 10K 13 R199 R172 R201 74HC132 TL074

2 13 22K 74HC132 100K 1M 14 REM LOWER REM U8D 1N4148 R202 C49 12 2 D37 R52 R180 1K 10 100K 8 + JP5 3K U23C 20pF C33 C34 1N4148 9 6 .01uF +5V OPEN FOR FM30 UNITS Q7 5W.) below R69 4.7uF (.135V) U10B 7 TANT.

(Clamp SWR reading SWR (Clamp 5 1 8 TL074 10K

1 9 2 7 R70 R56 TL072 12 4 8 3 6 C51 1.15K 100K U6C C135 11 R54 1 6 10 .01 4 5 R211 .001 1% U6D U6B 49.9K 1% 13 100K U6A 3 5 D39 LM394 2 74HC132 1N4148 74HC132 C37 C38 74HC132

11 Q6 VR1 .01uF 74HC132 .01uf B RF FWD B -12V 9 TL074 (2.5VDC at 100W) LM7905 1 8 2 8 -12V 2 3 R138 2 7 Vin Vout -5V 1 10 U24C 10K 3 6 C53 3 U24A

J2-9 R205 4 5 1.0 GND C52 TL074 R203 1.0 10K 11 C134 100K 6 LM394 -12V C39 1 4 +12V.001 7 .001 D38 U24B R215 5 R207 R209 2 1N6263 1 R51 10K 3.3K R213 VDD +12V + TL074 7.5K 3 U8A C122 49.9K RF_LVL 3.32K 3 2 1 1% 13 R147 (1.00V at 100W) VR4 10/35V R204 J26 1% R148 100 C130 +12V VCC D10 1% 14 METER RFW 78L05 D48 TL074 TANT 22K OPEN U24D J4-5 1.0 1N4148

12 +12V 3 1 +12V 4 SW8 100 Vin Vout +5V POWER CAL -6.9V + C126 -12V SWITCH 10 9 TL074 C133 47/20V C156 LM329DZ LOCAL ONLY 8 7 1.0 GND POWER SET -12V -12V R208 U8,9 pin 7 6 5 METER RFW 1.0 -6.9V +12V +12V 10.0K NOTES: 4 3 1% 2 1 2 VSS C143 R214 UNLESS OTHERWISE SPECIFIED: -12V 1.0 3.3K C128 C139 VEE TITLE: A 1. ALL RESISTORS ARE IN OHMS, 1/4 W, 5% TOL. 1.0 1.0 SCH, UNIVERSAL MOTHER BOARD A 13 -12V 2. ALL CAPACITORS ARE IN MICROFARADS. R210 REV 14 1.1K SIZE DWG . NO . 12 U23D +5.00V 1% +5.00V 201497F-SCH TL074 J3-9,10 C A J4-12 SCALE : NONE PROJ NO. SHEET2 OF 3 12 345 67 89101112 C_L_SHT2_A.DOT REV. A Schematic Diagram: Motherboard (Sheet 2 of 3)

6-10 Adjustments and Tests FM30/150/300 User’s Manual 12 345 6DWG. NO. 201497F-SCHREV. A 8 9 10 11 12

+8V 88-108 MHZ

+12V R81 C80 +12V 100PF 150 H C99 H 2 A2 1 8 1 R97 R86 MAR-6 C79 2 499K +8V VU5 OPEN 1 6 .001 VU5 U12A 1%

3 3 7 FM_/LOCK U12B NE5532 5 R87 499K C81

+5V FM_/LOCK 4 R88 FSK-R NE5532 1% +5V 100 .001 C74 Y1 1% D15 +5V 1 14 .001 + CV +VDD C91 1N4148 R80 R103 8 10/35V 15 OUTPUT R102 TANT. 7 1M C98 GND J31 LOCK DET. 200K 13 12 11 10 C78 LOCK .001 5V_TCXO .01 1 C109 C75 2 1 U15F U15E VVCO 74HC14 74HC14 .001 3 D19 4 1N4148 R105 5 100K C104 R79

G TO G 6 1% 1 POLY 100 7 1% 8 U13 C90 9 MAR-6 OSC in 1 16 VDD R106 10 C103 .001 VCO1 .001 J1 OF 201508F-PWA 10 1 16 R222 7 5 3 1 2 15 MC33284P POS-150 1 2 2 15 C92 C108 1.0K RF OUT HEADER 10 3 14 R111 13 A1 3 14 1 3900PF 1% LOCATED ON FRONT PANEL C101 Fin 4 13 9 100K 14 FREQUENCY SELECTION PWA SELECTION FREQUENCY C77

4 13 1% U14D 8 6 4 2 100pF 5 12 8 12 C89 .001 5 12 R98 U14C R113 33pF NPO

6 11 10 3 6 11 100K C111 R96 7 10 R114 10.0K 7 10 1% MC33284P 150 8 9 100K C107 0.01 1% 8 9 1% .001 POLY MC145170 R89 R95 R115 R112 15 100 100K 100 CLOCK 1% 1% 1% C112 /ENABLE 220pF +5V +5V D25 + C110 DATA 1N4148 47/20V F TANT. F R109 +5V 6 D23 100K R122 4.99K

U17 9 7 U18 9 7 7 1N4148 1% R123 OPEN OPEN U14B 1% J20 VDD 5 39 OPEN R99 +8V Z34 100K + D22 QH QH QH QH 9 7 5 3 1 MC33284P C105 JUMPER R131 1% 1N4148 R119 150K 10/35V 10.0K 1 18 C87 RA2 RA1 TANT. C85 1% 2 17 0.1 10 8 6 4 2 SER A B C D E F G H CLK INH SH/LD SER A B C D E F G H CLK INH SH/LD RA3 RA0 1000pF

3 16 R104 1 2 D26 RTC OSC1 4 15 100K OPEN CLR OSC2 C116 R82 D28 3 4 5 6 2 1 3 4 5 6 2 1 5 14 1% -12V 10 11 12 13 14 15 10 11 12 13 14 15 VSS VDD 6 13 .001 POLY 4 TP RB0 RB7 R75 R77 5.11K 1% OPEN LOAD 7 12 R116 RB1 RB6 24.3K 1% 10.0K DATA 8 11 100K 3 RB2 RB5 1% R83 CLK 9 10 1% 1 6 RB3 RB4 U11A 5.11K 1% S 2 U11B 7 RP1 R129 C86 TL072 5

U16 R76 G OPEN 10.0K 0.1 PIC16C61 D21 1N4148 TL072 Q4 D14 30.1K 1% 10 1% 8 C94 0.1 IRFD9120 D 3.9V E 9 10 RF_LVL E 8 9 +12V 7 8 C113 1 6 7 8 SW9 POLY 5 6 RESET 4 5 9 R124 1M R84 3 4 26.7K 1% 2 3 4 VU5 R125 VU5 1 2 68K C106 R78 C84 1 2 R110 10K D27 1 1 0.1 U14A 2K D20 PWR. CNTRL TILT RP2 1N4148 3 2W 1N5353B R85 R92 TP2 OPEN MC33284P -12V 4.5 - 8.0V 16V 24.3K 1% 680.0 11 R71 C88 0.1 R127 5 4 3 2 1 5 4 3 2 1 5 4 3 2 1 5 4 3 2 1 5 4 3 2 1 OPEN 25K C102 1 DC SUPPLY R93 LF SEP. 2K SW3 SW4 SW5 SW6 SW7 D16 D + R94 PWR. CNTRL. OFFSET D

OPEN OPEN OPEN OPEN OPEN R72 C114 499 1% TP1 1K BECKMAN 10/35V TANT. 6.2V 1N753A COMPOSITE1 VR2 COMPOSITE1 LM317 C69 DS3 +5V +12V 3 1 8.26V 100PF FSK R120 IN OUT +8V +5V C R74 R13410.0K 1% 1.0K AMBER 237 1% R108 + C72 DS1 2 1% + C71 FM_/LOCK 3 680 10/35V U15B U15A R133 10.0K 1% GREEN TANT. SP1 10/35V 74HC14 74HC14 FM WR FM TANT. + C70 R73 4 3 2 1 3 1 2 1.27K +5V R13210.0K 1% 10/35V 1% SP3 WR TANT. 1 R118 10.0K 1% 2 SP2 WR

1 DS2 9 8 5 62 RED R107 R11710.0K 1% C 680 C

U15D U15C FM

74HC14 2 74HC14

SP4 3 1 3 VR3 LM78L05 FREQ. ADJ. R101 C95 3 1 WR FM 50K .001 IN OUT +5V

LOC/REMOTE Frequency Select C + C83 LOC/REMOTE 2 4 6 8 C82 10 1 C73 J20 FSK-R 10/35V C97 2 TANT. .001 HEADER 5X2 .001 1 3 5 7 9 R100

100K 1% +12V FSK IN FSK IN C76 D24 R .001 1N4148 R224 NOT USED 10K D17 CH. SEL. B VU5 B BAND LIMIT OFFSET 1N6263 DIRECT FSK AUTO ID FREQ. ADJ. ID

RF_LVL

TITLE: A SCH, UNIVERSAL MOTHER BOARD A

SIZE DWG . NO . REV C 201497F-SCH A

SCALE : NONE PROJ NO. SHEET33 OF 12 345 67 89101112 C_L_SHT2_A.DOT REV. A Schematic Diagram: Motherboard (Sheet 3 of 3)

FM30/FM150/FM300 User’s Manual 6-11 Board Layouts and Schematics

1234 REVISION HISTORY APPROVALS E . C . N. REV DESCRIPTION DATE DWN CHK CM PE A PRODUCTION RELEASE 03-08-07 DW DW DP

F F

Illustration 6-7 FM Frequency Selection Board (Top-Side)

E E

U1 9 7 U2 9 7 74HC165 74HC165

QH QH QH QH +5V

J1 SER A B C D E F G H CLK INH SH/LD SER A B C D E F G H CLK INH SH/LD REV. D1 1 1N4148 2 3 4 5 6 2 1 3 4 5 6 2 1

10 11 12 13 14 15 10 11 12 13 14 15 3 4 5 6 7 RP1 8 DWG. NO. D 100K RPACK 9 D 10 10 9 10 HEADER 5 x 2 8 9 7 8 6 7 5 6 4 5 3 4 2 3 1 2 1

RP2 Illustration 6-8 FM Frequency Selection Board (Bottom-Side) 100K RPACK C C 5 4 3 2 1 5 4 3 2 1 5 4 3 2 1 5 4 3 2 1 5 4 3 2 1

SW1 SW2 SW3 SW4 SW5

B B IREC UNCONTROLLED APPROVALS INTERNATIONAL RADIO AND ELECTRONICS CORP. UNLESS OTHERWISE MARKED IN RED INK DWN DW 11-14-06 25166 LEER DRIVE ELKHART, IN. 46514 BY CM AS A CONTROLLED COPY, COPIES OF THESE DOCUMENTS INCLUDING 574-262-8900 ASSOCIATED ELECTRONIC REPRODUCTIONS CHK ARE FOR REFERENCE ONLY. TITLE: DW 11-14-06 A CM SCH, FM FREQUENCY SELECTION A THESE DRAWINGS AND SPECIFICATIONS PE DP 11-14-06 ARE THE PROPERTY OF INTERNATIONAL SIZE DWG . NO .WWW.IREC1.COM REV RADIO AND ELECTRONICS CORP. AND SHALL NOT BE REPRODUCED, COPIED OR DISTRIBUTION USED AS THE BASIS FOR THE A 201508F-SCH MANUFACTURE OR SALE OF APPARATUS A OR DEVICES WITHOUT PERMISSION. FILENAME: SCALE : NONE PROJ NO. 551SHEET 1 OF

1234 A_P_SHT1_A.DOT REV. A

Schematic Diagram: FM Frequency Selection

6-12 Adjustments and Tests FM30/150/300 User’s Manual Illustration 6-9 FM Display Board

FM30/FM150/FM300 User’s Manual 6-13 Board Layouts and Schematics

12 345 6DWG. NO. Q43113-2FREV. H 8 9 10 11 12 REVISION HISTORY APPROVALS JP1 OPEN E . C . N. REV DESCRIPTION DATE DWN CHK CM PE 336 G REDRAWN ON IREC FORMAT AND PWB CHG. TO REV. C 09-20-04 DW DW U4 U2 LM3915 LM3914 475 H PWA, PWB CHG'D TO ROHS 07-24-06 DW DW

1 2 DL1-10 9 10 10 9 R2 +12V MODE L10 RED L10 MODE H 100K H 8 11 11 8 R4 RADJ L9 YEL L9 RADJ 1.2K R14 1.2K 7 12 12 7 ROUT L8 GRN L8 ROUT C5 R1 4 -12V .001 D1 6 13 +5V 13 6 68K TL072 1N4148 R3 5.00V DHI L7 GRN L7 DHI 5.00V R13 L VU 2 DL21-25 1K 1 1K 5 14 14 5 U1A IN L6 GRN L6 IN

C1 3 HI GR C2 4 15 Y 15 4 1.0UF D2 1.0UF DLO L5 GRN L5 DLO +12V 1N4148 +5V 50mA G 8 3 16 16 3 +12V V+ L4 GRN L4 V+ +12V R30 150 2 17 G 17 2 V- L3 GRN L3 V- C6 +5V 1 18 G 18 1 0.1 L1 L2 GRN L2 L1 16 3 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 G 9 8 7 6 5 4 3 2 1 R6 R15 X RED 20 19 18 17 16 15 14 13 12 11 10 330 33K VCC U11 1000 100'S TENS UNITS 74HC4051 G DL101 G

R5 Q1 DITHER DISPLAY 1K MPS-A56 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 +5V X0 X1 X2 X3 X4 X5 X6 X7 EN A B C VEE GND JP2

OPEN 1 5 2 4 6 9 7 8 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 13 14 15 12 11 10 MOD. CAL. R16 R56 U5 220 U3 DL26-35 33K +5V DECIMAL POINT LM3915 LM3914 F.S. DL36-43

1 2 DL11-20 DP10 R8 9 10 10 9 DP100 +12V MODE L10 RED L10 MODE GRN 100K RED RF POWER 1999 8 11 11 8 C7 R10 RADJ L9 YEL L9 RADJ 0.1 1.2K R18 1.2K 7 12 Y 12 7 GRN C3 D3 ROUT L8 GRN L8 ROUT SWR 19.99 R7 1N4148 1.0 6 13 G 13 6 68K 5.00V DHI L7 GRN L7 DHI 5.00V R17 R VU 6 TL072 R9 GRN 1K ALC 19.99 7 1K 5 14 G 14 5 U1B IN L6 GRN 50mA L6 IN 5 C4 4 15 G 15 4 BR GR GRN D4 1.0 DLO L5 GRN L5 DLO PA DC VOLTS 199.9 1N4148 3 16 G 16 3 C8 F +12V V+ L4 GRN L4 V+ +12V F .001 GRN +5V PA DC AMPS 19.99 2 17 G 17 2 V- L3 GRN L3 V- 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 1 18 G 18 1 GRN L1 L2 GRN L2 L1 PA TEMPERATURE 199.9 9 8 7 6 5 4 3 2 1

Y 20 19 18 17 16 15 14 13 12 11 10 U12 GRN RED R12 Y ICL7107 SUPPLY DC VOLTS 199.9 330

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 GRN Q2 VOLTMETER 19.99 R11 1K MPS-A56 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 R36 100K C13 .01 4 -12V 2 R31 R33 C14 C15 R35 TL072 5.6K 33K R38 0.1 0.1 100K 1 6 100K E 3 U6A 7 DITHER R37 E D16 5 U6B R51 DZ1 C27 470K R32 10V P-P DITHER 2.2K 6.2V 1.0UF +12V D17 TL072

8 620

1N4148 1N4148 R34 -12V 5.1K C25 C16 C17 C18 C19 0.1 0.1 0.1 0.1 100PF DOWN C21 +5V SW6 R54 1K .01 R26 3 U9B 4 D5 33K U10 R40 1N6263 C33 R42 74HC14 14 12 100K CLR CO COMPOSITE .001 10K 5 13 UP BO 4 +5V DOWN 11 3 R22 R23 LOAD QA 15 2 10.0K 10.0K A QB UP C20 1 6 B QC 1% 1% Q4 6 TL072 JUMPER FOR BAR SW5 R28 .01 10 7 R45 1K C QD D +12V 2N5087 7 JP3 +5V 1 2 9 D 100 D 5 U13B U9A DL48-58 R39 R41 74HC14 74HC193 4 C26 C11 U8 C28 C32 D6 1.0UF R46 R43 LM3914 "110" 100K .001 10K -12V 0.1 D18 +12V 1 2 10M 3.3M DL44-47, 59 5.00V 2 1N6263 R44 9 10 R52 5.6K 5.00V 33K MODE L10 RED 1.0UF 1 1N4148 PA TEMP 3 U7A 8 11 TL072 RADJ L9 YEL R53 -12V DL59 RED J2 +12V R27 2.7K 7 12 SEL A 1K ROUT L8 GRN 2 1 TL072 4

8 6 SEL B 4 3 7 Q3 -12V 6 13 PA DC SEL C U7B R47 5.00V DHI L7 GRN 6 5 5 2 RF LEVEL 2N5210 TL072 1K 8 7 1 5 14 5.00V 5.00V IN L6 GRN DL47 RED 10 9 D7 3 U13A PATEMP LAMP R19 12 11 R48 1K 4 15 PADC LAMP 1N4148 DLO L5 GRN 510 14 13 C10 +12V 13 12 INPUT INPUT R24 C12 0.1 U9F 16 15

8 3 16 LOCK LAMP DPM REF .001 +12V V+ L4 GRN 18 17 1M SWR LAMP DPM IN 74HC14 DL46 RED 20 19 R25 2 17 10K V- L3 GRN +12V HEADER 10X2 +12V C 1 18 R50 LOCK -12V -12V C L1 L2 GRN 100K BECKMAN C9 R20 5.00V 5.00V 220K Pin 1, upper left from front of unit. R49 GRN 1.0UF DL45 RED 10K J1 MOD. CAL. +12V +12V 2 1 SWR -12V -12V 4 3 L VU /+12DB R29 6 5 R VU /+6DB R55 "PILOT" 680 DL44 RED 8 7 5.00V 5.00V GRN 10 9 4.7K PROC A 12 11 SW3 PROC B 14 13 DPDT STEREO PROC C COMPOSITE 16 15 BR GR +5V 18 17 HI GR MON/ST 20 19 MONO HEADER 10X2 COMPOSITE R VU L VU

SW1 B /+6DB B +12V DPDT +12V C31 5.00V 1.0UF 5 6 R57 U9C SW2 VR1 DPDT /+12DB C34 7805 VDD 1.0UF VCC 74HC14 1 3 Vin Vout +5V 1K BECKMAN C23 14 16 GND C24 C29 1.0UF 1.0UF 9 8 1.0UF U9 U10 U9D R58 0 2 U11 74HC14 7 IREC 8 APPROVALS INTERNATIONAL RADIO AND ELECTRONICS CORP. VEE 09-20-04 25166 LEER DRIVE ELKHART, IN. 46514 11 10 DWN DW C22 C30 VSS U9E 574-262-8900 1.0UF 1.0UF CHK 74HC14 TITLE: -12V -12V CM A SCH, FM/IBOC DISPLAY A UNCONTROLLED THESE DRAWINGS AND SPECIFICATIONS ARE THE PE SIZE DWG . NO . WWW.IREC1.COM REV NOTES : UNLESS OTHERWISE SPECIFIED: UNLESS OTHERWISE MARKED IN RED INK BY CM AS A PROPERTY OF INTERNATIONAL RADIO CORP. DISTRIBUTION 1. ALL RESISTORS ARE IN OHMS, 1/4W, 5% TOL. CONTROLLED COPY, COPIES OF THESE DOCUMENTS AND SHALL NOT BE REPRODUCED, COPIED OR USED AS C Q43113-2F H THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR K 2. ALL CAPACITORS ARE IN MICROFARADS. INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS DEVICES WITHOUT PERMISSION. ARE FOR REFERENCE ONLY. FILENAME: SCALE : NONE PROJ NO. SHEET OF

12 345 67 89101112 C_L_SHT1_A.DOT REV. A Schematic Diagram: FM Display

6-14 Adjustments and Tests FM30/150/300 User’s Manual Illustration 6-10 FM Voltage Regulator

FM30/FM150/FM300 User’s Manual 6-15 Board Layouts and Schematics

12 345 6DWG. NO. REV. 89101112 REVISION HISTORY APPROVALS E . C . N. REV DESCRIPTION DATE DWN CHK CM PE 475AF REDRAWN ON IREC FORMAT. PWA & PWB NOW RoHS 9-14-06 DW DW DP

493AG CORRECTED PWB TO CONNECT R29 2-19-07 DW DW DP

H R1 H CARR SW 4.7K R2 U3C 10.0K /CARRIER OFF 5 6

R33 74HC14 4.7K

D1 1N4148 +12V VDD R23 R3 U3A U3B D2 1.0K G 4.7K 1N4148 G /AUTO CARRIER 1 2 3 4 +6V VDD R4 VCC 10.0K 74HC14 74HC14 DZ1 1N4735 6.2V +12V D7 1N4148 VSS R9 R13 1.0K 100K

C2 R7 C26 0.1 VDD .001 120K 16 U2 R22 C3 11 R5 -12V D6 R16 74HC4060 .001 D3 6 U1B 1N4148 7 100K F R8 Q4 91K 2 1N6263 7 10.0K 12 5 F U1A 51K RST Q5 1 5 VCC 4 Q6 3 6 TL074 Q7 TIME-OUT SELECT 14 D8 R6 TL074 Q8 U3D R15 R17 13 JP1 1N4148 Q9 5.1K R14 2.2K 10.0K .5

4 +12V 15 9 8 220.0 Q10 2 1 1 2 Q12 4 3 AUDIO or COMPOSITE 2 4 C27 Q13 6 5 COMP2 3 8 74HC14 0.1 Q14 8 7 DL1 DL2 INPUT FAULT 10 9 RED 9 C1 GREEN COUT 11 .01 CIN HEADER 5X2 10 U1D D4 GND COUT 1N6263 R11 R10 13 100K 75K 14 8 12 R18 VDD 1% TL074 100K C4 R12 C5 .001 1.0M 1.0 R19 R21 C6 PROGRAM DETECT POLY 24.9K 1.0 E 10.0K 1% POLY E U1C NOTES: 9 8 10 UNLESS OTHERWISE SPECIFIED: TL074 1. ALL RESISTORS ARE IN OHMS, 1/4W, 5% TOL. R20 2. ALL CAPACITORS ARE IN MICROFARADS. 10.0K 3. FOR FM30, 100 & 250 UNITS, R32 VALUE = 82.5K OHM, 1/4W, 1% TOL.. FOR HARRIS UNITS, R32 VALUE = 100K OHM, 1/4W, 1% TOL. R24 100.0 +UNREG P1 R34 Q5 10.0K MPSA06 D D U4 LM3578 D10 DZ2 + C23 330/100V 1 8 1N4148 1N966B -IN V+ U5 Q4 C12 2 7 IR2125 MJE15028 +IN CS 1.0 C14 DRVR V+ 3 6 1 8 OSC C VCC VB .1 R35 Q3 C9 C11 51.0 Q1 R40 R43 + C25 4 5 2 7 IRF540 + MPSA56 2200Pf .01 C29 GND E IN OUT C18 10.0 220.0 220/63V VDD VDD POLY C10 R37 56Pf R30 3 6 220/63V NPO ERR CS D9 R28 2.2K C13 2.2K R39 510 C28 R48 4 5 R38 R38A 1 R25 OPEN 68K 56Pf 100Pf ESS VS C15 R36 1.0 1.0 L1 C7 100K U3F C8 10.0K U3E 0.1 0.5W 0.5W NPO 2.0K DZ3 1.5KE36A .001 220pF 380UH 13 12 11 10 R29 R49 4.12K D11 C19 + R41 C 1.5K 1% R32 MUR120 1000/35V 1.0K C R26 74HC14 74HC14 R27 SEE NOTE 3 100K 620.0 Q2 MPSA06 FM 30/100/250 = D 6977-9 3 2 C16 Vout Vin +12V METER UNREG +UNREG -12V

R50 GND HD4 JP2 R42 100 SYNC OPEN 1 6 VR1 OPEN 1.0K

CARR SW INPUT FAULT -12V 1 5 DRVR V+ DRVR V+ 2 4 PAV 3 PAI OPEN 2 C24 ALC L4 D14 1 1N5822 10/35V 6 5 4 3 2 1 960 uH HEADER 6 +12V -12V + (TO POWER REG. BOARD) /LOCK FAULT -12V

HD1 R51 U6

+ C22 + C21 D13 B (JUMPER) L3 2 1 B 3300/16V 220/63V 1N5822 OUT Vin 960UH 5 L2 ON/OFF 1 3 5 7 9 11 13 15 17 19 4 FEEDBACK D15 960UH 3 3 2 1 R45 GND 1N4004 HD2 DZ4

2 4 6 8 10 12 14 16 18 20 C20 HEADER 10X2 HEADER 1800/35V + ICTE-12 10.K LM2576-ADJ HD3 R44 FAN +12V 1% 1.1K +12V COMP2 1% 38KHZ /CARRIER OFF /AUTO CARRIER FM 30/100/250 = C 7746-8 IREC APPROVALS INTERNATIONAL RADIO AND ELECTRONICS CORP. FM 30/100/250 = C 8667-5 DWN DW 9-14-06 25166 LEER DRIVE ELKHART, IN. 46514 CHK 574-262-8900 TITLE: CM A SCH, FM VOLTAGE REGULATOR A UNCONTROLLED THESE DRAWINGS AND SPECIFICATIONS ARE THE PE SIZE DWG . NO . WWW.IREC1.COM REV UNLESS OTHERWISE MARKED IN RED INK BY CM AS A PROPERTY OF INTERNATIONAL RADIO CORP. DISTRIBUTION CONTROLLED COPY, COPIES OF THESE DOCUMENTS AND SHALL NOT BE REPRODUCED, COPIED OR USED AS C Q43229-6F AG INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR K DEVICES WITHOUT PERMISSION. ARE FOR REFERENCE ONLY. FILENAME: SCALE : NONE PROJ NO. SHEET OF

12 345 67 89101112 C_L_SHT1_A.DOT REV. A

Schematic Diagram: FM Voltage Regulator

6-16 Adjustments and Tests FM30/150/300 User’s Manual Illustration 6-11 FM Power Regulator

FM30/FM150/FM300 User’s Manual 6-17 Board Layouts and Schematics

12345 6 78 REVISION HISTORY APPROVALS ON CHASSIS E . C . N. REV DESCRIPTION DATE DWN CHK CM PE

P801 1 3 A PRODUCTION RELEASE 10-31-03 DW DW DP BATTERY FASTON TAB 274 B CORRECTED Z3 AND Z6 UNIT STATUS FOR M2 AND FM100 01-29-04 DW DW DP ~ D804 F P802 BYV72EW-150 323 C SWAPPED Z1, Z2 TO MATCH PWB 08-10-04 DW DW DP - + DC INPUT FASTON TAB 475 D PWA & PWB NOW RoHS. CHG'D P/N 07-25-06 DW DW DP C1001

~ 2 0.015F F 110V P806 FASTON TAB

P803 FASTON TAB

CIRCUIT BREAKER L801 P804 + UNREG IN FASTON TAB 30UH C815 + C816 + + C817 P805 330/100V 330/100V 330/100V FASTON TAB P807 FASTON TAB E E R801A 27.4K 2 1 *Z3 HD1 Z2 1 2 * 1 R801B 2 2 1 * R827 R808 3 24.9K Z1 * 4 * DZ806 1.0K 1.0K 5 1N4735 6.2V 6 DZ801 D802 U801 C812 C 7527-2_6 HDR 1/50V 1N4148 R828 1 8 *

-IN V+ 1N966B 16V 30K 2 7 U2 +IN CS C809 R821 3 6 1 8 .1 R809 10.0K 1 OSC C VCC VB Q801 R817A C804 *Z4 C801 4 5 2 7 51.0 IRF540 Q804 100 1 2 GND E IN OUT 220PF C802 C803 .01 MPSA06 D R802 2 3 6 R811 10K ERR CS 56PF LM3578AN R807 DZ803 Z5 C805 4 5 C808 * R812A R812B R817B 1 * 2 PA VOLTAGE SET 82K 1N4735 6.2V

R803 2.2K C814 100PF ESS VS R810 L803 2200PF POLY 0.1 0.1 2.0K R819 2K P808 3 R806A 1/50V .0027 5W 5W 30UH .04 OHM 15W 3% 2 2W 330K IR2125 PA-DC OUT 1 2 L802 FASTON TAB + C811 + TP2 Z7 DZ807 C820 DWG. NO. REV. * R806B * D803 * C810 R818A R818B C813 R815 1 2 1N966B 16V BYV72EW-150 330/100V 2.0K 2.0K .01UF 100.0 0.01UF DISK 2W R816

330/100V 2W Z6 200K 1.0K 1% * R813 3 1 TP1 R805A C806 1.0K 1 2 330K + Z9 * R805B D805 4.7UF/63V C819 C 1 2 7 C 1N4148 R820 U803 .01UF Z8 200K 100K OP-27GNB R804 * 2 OPEN 6 Q803 10.0K 1% 3 2N5087 C818 .1UF R822 DZ802 4 1 8 * UNIT CONFIGURATION NOTES: 1N966B 16V 22.0K JUMPER FM1 FM30 FM100 FM250 FM500 EURO HARRIS M1 HARRIS M2 Z1 OPEN OPEN OPEN OPEN SHORT OPEN OPEN SHORT UNLESS OTHERWISE SPECIFIED: Q802 R814 MPSA56 Z2 SHORT SHORT SHORT SHORT OPEN SHORT SHORT OPEN 22.0K Z3 SHORT SHORT SHORT SHORT SHORT SHORT OPEN 1. ALL RESISTORS ARE IN OHMS, Z8 SHORT SHORT OPEN OPEN OPEN OPEN OPEN OPEN 1/4W, 5% TOL. B Z7 OPEN OPEN SHORT SHORT SHORT SHORT SHORT SHORT B Z6 SHORT SHORT OPEN OPEN OPEN OPEN OPEN OPEN 2. ALL CAPACITORS ARE IN MICROFARADS. Z4 SHORT SHORT SHORT SHORT OPEN SHORT SHORT OPEN Z5 OPEN OPEN OPENOPEN SHORT OPEN OPEN SHORT REF DES Z9 OPEN OPEN SHORT SHORT SHORT SHORT SHORT SHORT L802 H43608-1 H43395-5 H43533-1 H43533-1 H43533-1 H43533-1 H43533-1 H43533-1 R811 3.3K 3.3K3.3K 3.3K 3.3K 5.11K 1% 3.3K 3.3K IREC R827 OPEN OPEN OPEN OPEN OPEN OPEN INSTALLED INSTALLED APPROVALS INTERNATIONAL RADIO AND ELECTRONICS CORP. R828 OPEN OPEN OPEN OPEN OPEN OPEN INSTALLED INSTALLED DWN DW 09-30-03 25166 LEER DRIVE ELKHART, IN. 46514 DZ806 OPEN OPEN OPEN OPEN OPEN OPEN 574-262-8900 INSTALLED INSTALLED CHK DZ807 OPEN OPEN OPEN OPEN OPEN OPEN INSTALLED INSTALLED TITLE: CM DW 09-30-03 FM POWER REGULATOR A UNCONTROLLED PE DP 09-30-03 A THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF SIZE DWG . NO . WWW.IREC1.COM REV. UNLESS OTHERWISE MARKED IN RED INK BY CM AS A INTERNATIONAL RADIO AND ELECTRONICS CORP. DISTRIBUTION B CONTROLLED COPY, COPIES OF THESE DOCUMENTS AND ARE NOT TO BE REPRODUCED, COPIED OR USED AS THE BASIS 200915F-SCH D INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS FOR THE MANUFACTURE OR SALE OF APPARATUS OR C10582-2 ARE FOR REFERENCE ONLY. DEVICES WITHOUT PERMISSION. FILENAME: 200915-SCH SCALE : NONE PROJ NO. 533 SHEET

1 234 5 678 B_L_SHT1_A.DOT REV. A

Schematic Diagram: FM Power Regulator

6-18 Adjustments and Tests FM30/150/300 User’s Manual R19

Illustration 6-12 FM Power Amplifier FM150/FM300

FM30/FM150/FM300 User’s Manual 6-19 Board Layouts and Schematics

12345 6 78 REVISION HISTORY APPROVALS E . C . N. REV DESCRIPTION DATE DWN CHK CM PE A PRODUCTION RELEASE 02-20-07 DW DW DP

L21 E E PA DC R01 50NH

R10 C10 15K C21 C22 C01 R18 12K .01 .01 0.1 .01 2.7K DZ10 6.2V 1

2 R11 L22 10K 50NH C11 .01 R12 R13 3 R16 5.6 5.6 10, 1/8W LB01 C12 C13 .01 Q01 D J01 .01 C25 BEAD SD2942 J02 BNC RECEPT T21 55pF BNC RECEPT. G2 D2 R19 C16A 200 R17 S

C16B 24, 3W 3W C23 C24 C26 DWG. NO. REV.

6.5-30pF 10PF T11S G1 D1 .01 .68 .01

T1111P C14 C15 .01 .01 R14 R15 NOTES: C 5.6 5.6 C UNLESS OTHERWISE SPECIFIED: PA INPUT PA OUTPUT 1. ALL RESISTORS ARE IN OHMS, 1/4W, +/- 5% TOL. 2. ALL CAPACITORS ARE IN MICROFARADS. 3. C10 - C15 = .01 CHIP 4. L21 AND L22 = 8 TURNS CLOSE-WOUND, 3/16 INCH I.D.

B B IREC APPROVALS INTERNATIONAL RADIO AND ELECTRONICS CORP. DWN DW 02-20-07 25166 LEER DRIVE ELKHART, IN. 46514 574-262-8900 CHK TITLE: CM DW 02-20-07 FM RF AMPLIFIER

A UNCONTROLLED PE DP 02-20-07 A THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF SIZE DWG . NO . WWW.IREC1.COM REV. UNLESS OTHERWISE MARKED IN RED INK BY CM AS A INTERNATIONAL RADIO AND ELECTRONICS CORP. DISTRIBUTION B CONTROLLED COPY, COPIES OF THESE DOCUMENTS AND ARE NOT TO BE REPRODUCED, COPIED OR USED AS THE BASIS 201551F-SCH A INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS FOR THE MANUFACTURE OR SALE OF APPARATUS OR ARE FOR REFERENCE ONLY. DEVICES WITHOUT PERMISSION. FILENAME: SCALE : NONE PROJ NO. SHEET 1

1 234 5 678 B_L_SHT1_A.DOT REV. A

Schematic Diagram: FM RF Amplifier

6-20 Adjustments and Tests FM30/150/300 User’s Manual Illustration 6-13 FM Low Pass Filter #2

FM30/FM150/FM300 User’s Manual 6-21 Board Layouts and Schematics

EP 12345 6 78 REVISION HISTORY APPROVALS E . C . N. REV DESCRIPTION DATE DWN CHK CM PE J REDRAWN 12-05-03 DW DP

E E

C11 47pF NPO SHIELD

C2 C4 C6 C8 R3 1.35pF 7.1pF 9.3pF 5.13pF R2 73.2 10 J1 RF IN RF OUT

L2 L3 L4 L5 J2 90.5nH 94.1nH 87.5nH 77.9nH BNC

D R4 10 R5 L1 C1A OPEN C17 C1 C3 C5 C7 C9 C10 73.2 D2 10pF 3.5pF 15.4pF 40.9pF 38.9pF 37.7pF 14.1pF 2pF R6 D1 1N6263 1N6263 1K FWD R9 1K REFL DWG. NO. REV. R7 C19 C12 C13 20K C14 C1-C10 AND C17 47pF 0.001uF 0.01uF 47pF NPO C15 R8 C16 ARE PWB COPPER AREAS .01 20K 0.001uF HD1 1 Aprox. 7V RMS 2 with 200w RF in C 3 R10 C RFV C18 R1 RF MONITOR 47pF 100 10K R11 C20

D3 100K .01 5 4 3 2 1 1N6263 HD2 1X5

NOTES: ======UNLESS OTHERWISE SPECIFIED 1) ALL RESTORS ARE IN OHMS, 1/4W, 5%

B 2) ALL CAPACITORS ARE IN MICROFARADS B

3) C1-C10 AND C17 ARE CIRCUIT BOARD PADS

4) IF NECESSARY, SELECT R2 FOR SWR READING OF IREC 1.1 OR BETTER WITH 50 OHM LOAD R5 = R2 APPROVALS INTERNATIONAL RADIO AND ELECTRONICS CORP. DWN DW 03-14-02 25166 LEER DRIVE ELKHART, IN. 46514 574-262-8900 CHK TITLE: CM FM LOW PASS FILTER #2

A UNCONTROLLED PE A THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF SIZE DWG . NO . WWW.IREC1.COM REV. UNLESS OTHERWISE MARKED IN RED INK BY CM AS A INTERNATIONAL RADIO AND ELECTRONICS CORP. DISTRIBUTION B CONTROLLED COPY, COPIES OF THESE DOCUMENTS AND ARE NOT TO BE REPRODUCED, COPIED OR USED AS THE BASIS 103209-SCH J INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS FOR THE MANUFACTURE OR SALE OF APPARATUS OR ARE FOR REFERENCE ONLY. DEVICES WITHOUT PERMISSION. FILENAME: SCALE : NONE PROJ NO. SHEET

1 234 5 678 B_L_SHT1_A.DOT REV. A

Schematic Diagram: FM Low Pass Filter #2

Adjustments and Tests 6-22 FM30/150/300 User’s Manual Illustration 6-14 FM RF Driver

FM30/FM150/FM300 User’s Manual 6-23 Board Layouts and Schematics

12345 6 78 REVISION HISTORY APPROVALS E . C . N. REV DESCRIPTION DATE DWN CHK CM PE 264 M PRODUCTION RELEASE 12-10-03 DW DW DP 279 N XU1 WAS 200479-TERM-10 01-29-04 DW DW MH ADDED TO PWB (200922-PWB-D IN LOCATION F SHOWN, AND DEPICTED ON COMPONENT MAP. 316 O PWB CHG'D TO REV. C 06-14-04 DW DW DP 361 P PWB CHG'D TO REV. D 03-22-05 DW DW DP C23 C24 475 Q PWA & PWB NOW RoHS. 07-28-06 DW DW DP F

.01 .01

R5 C7 C8 OPEN 0.01 OPEN L6 C4 XU1 R18 R7 OPEN OPEN MHW6342T 0 OPEN L4 L5 C15 J2 IN GND GND N/C VCC N/C GND GND OUT 10.4uH 23.2uH 680pF RF OUT D1 D2 Q1 OPEN OPEN 1 2 3 4 5 6 7 8 9 BLF245 J1 D 3 2 C5 RF IN C1 T1 G E E 22 1 1 R2 R4 S .01 2 3 R1 OPEN OPEN R6 R17 L2 C10 C11 C12 C13 C14 OPEN OPEN 51 L3 C2 R3 C3 OPEN 10pF 36pF 36pF 5pF 27pF OPEN OPEN .01 C6 C22 0.01 OPEN

C9 C21 VR1 OPEN OPEN OPEN L1 1 3 +5V 33uH FOR FM30: Vin Vout 20VDC INPUT APPLIED HERE. D FOR FM100 AND FM250: 18V

GND C18 Q43310-4F Q OPEN FOR FM500: 20V

2 R16 R8 FOR FM30: FEED POINT FROM PWR. REGULATOR PWB. OPEN * +24VDC J3 DWG. NO. REV. 1 L7 R11 OPEN 4.7K R12 R9 51 OPEN RT1 1/2W R10 D3 C T R13 C17 C 10K 1N753A 2.7K NTC 0.01 OPEN OPEN C16 C20 6.2V 0.01 OPEN 8 J4 3 U2A 5 U2B 1 1 7 2 6 OPEN C19 OPEN

OPEN 4 NOTE: UNLESS OTHERWISE SPECIFIED: B B R14 R8 POWER LEVEL CONFIGURATION 1. ALL RESISTORS ARE IN OHMS, 1/4 WATT +/- 5% TOL. FM30 FM100 FM250 FM500 2. ALL CAPACITORS ARE IN MICROFARADS. OPEN OPEN 3 OHM 5W3 OHM 5W 2.7 OHM 5W R15 OPEN IREC APPROVALS INTERNATIONAL RADIO AND ELECTRONICS CORP. DWN DW 08-28-03 25166 LEER DRIVE ELKHART, IN. 46514 574-262-8900 J5 CHK TITLE: 1 CM DW 10-30-03 SCH, FM RF DRIVER A UNCONTROLLED PE DP 10-30-03 A THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF SIZE DWG . NO . WWW.IREC1.COM REV. UNLESS OTHERWISE MARKED IN RED INK BY CM AS A INTERNATIONAL RADIO AND ELECTRONICS CORP. DISTRIBUTION B CONTROLLED COPY, COPIES OF THESE DOCUMENTS AND ARE NOT TO BE REPRODUCED, COPIED OR USED AS THE BASIS Q43310-4F Q INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS FOR THE MANUFACTURE OR SALE OF APPARATUS OR ARE FOR REFERENCE ONLY. DEVICES WITHOUT PERMISSION. FILENAME: SCALE : NONE PROJ NO. 533 SHEET

1 234 5 678 B_L_SHT1_A.DOT REV. A

Schematic Diagram: FM RF Driver

6-24 Adjustments and Tests FM30/150/300 User’s Manual 1 2 34 56 REVISION HISTORY APPROVALS E . C . N. REV DESCRIPTION DATE DWN CHK CM PE 160-A A PRODUCTION RELEASE 02-19-02 DW

D D

PAD PAD PAD

B4 W.N.REV. DWG. NO.

J1 PAD PAD J2 BNC RF B3 1 GND C 2 FAN Illustration 6-15 FM Euroamp DC 3 TEMP+ GND PAD PAD 4 SENSE Input Feedthru (Top Side) 5 V1+ B2 6 V2+ HEADER 6 PAD PAD

PAD

PAD PAD PAD PAD

PAD PAD PAD C1 C2 C3 C4 C5 OPEN .01 .01 .01 .01 B Illustration 6-16 FM Euroamp DC Input Feedthru (Bottom Side) IREC UNCONTROLLED APPROVALS INTERNATIONAL RADIO AND ELECTRONICS CORP. 25166 LEER DRIVE ELKHART, IN. 46514 UNLESS OTHERWISE MARKED IN RED INK BY CM AS A DWN DW 02-07-02 CONTROLLED COPY, COPIES OF THESE DOCUMENTS 574-262-8900 INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS CHK ARE FOR REFERENCE ONLY. TITLE: CM SCH, FM EUROAMP DC INPUT FEED THRU A THESE DRAWINGS AND SPECIFICATIONS ARE THE PE A PROPERTY OF INTERNATIONAL RADIO AND ELECTRONICS CORP. SIZE DWG . NO . WWW.IREC1.COM REV AND SHALL NOT BE REPRODUCED, COPIED OR USED AS THE BASIS DISTRIBUTION FOR THE MANUFACTURE OR SALE OF APPARATUS OR A 200419-SCH A DEVICES WITHOUT PERMISSION. K FILENAME: 200419-SCH-2.SCH SCALE : NONE PROJ NO. SHEET OF

A_L_SHT1_A.DOT REV. A 1 2 3 456

Schematic Diagram: FM Euroamp DC Input Feedthru

FM30/FM150/FM300 User’s Manual 6-25 Board Layouts and Schematics

12 345 6DWG. NO. 201232-SCH REV. A 89101112 REVISION HISTORY APPROVALS E . C . N. REV DESCRIPTION DATE DWN CHK CM PE A PRODUCTION RELEASE 04-04-05 DW DP

H H

BATTERY IN

CB1001 CIRCUIT BREAKER

ON MOTHER BOARD G G 20 C0ND. RIBBONCBL TO TO TO 9 7 5 3 1 MOTHER BOARD MOTHER BOARD MOTHER BOARD HD505 HD502 HD503

PL1002 x x x

3 2 1 3 2 1 PL1004 10 8 6 4 2 1 2 3 4 5 6 PA FAN TEMP SENSE RF DRIVER VOLTAGE REGULATOR HD702 PL1001 x BNC x RF IN RF OUT x 20 C0ND. RIBBONCBL 20 C0ND.

RF IN DRVR V+ DRVR V+ 6 FAN F 5 F -12V HD701 4 HEADER 6 PL1005 3 HD703 2 +12V HD4 1 J4 1 6 C0ND. RIBBONCBL P1 1 2 +UNREG 2 3 1 3 x x x

4 1 5

M1HD-S RF POWER AMP C1001 15,000UF/110V LP FILTER

RF OUT RF IN E R1003 E RF OUT RF OUT 2K 3W +

HD1 x x x P805 1 6 C0ND. RIBBONCBL P807 1 GND P804 1 P806 1 D GND D P803 1

1 Z3-2 P802 1 P808 1 PA DC OUT P801 1

POWER REGULATOR

CORCOM 6EDL4CM

H 220 100 240 120 NOT USED T1001 t C NEUTRAL F NTC 1 C MOV D1001 120/240 VAC E NTC t S1002 50/60HZ FILTER MOV D 4 2 ON

C HOT CARRIER B BRIDGE

3 OFF A

G S1002 SEE CHART * ON

* VOLTAGE FUSE SIZE POWER B 120V B 6.3A OFF 200V 220V 3A 240V SLO-BLO FOR ALL APPLICATIONS

APPROVALS IREC INTERNATIONAL RADIO AND ELECTRONICS CORP. DWN DW 04-04-05 25166 LEER DRIVE ELKHART, IN. 46514 CHK 574-262-8900 TITLE: CM DW 04-04-05 A SCH, FM CHASSIS INTERCONNECT A UNCONTROLLED THESE DRAWINGS AND SPECIFICATIONS ARE THE PE DP 06-24-04 SIZE DWG . NO . WWW.IREC1.COM REV UNLESS OTHERWISE MARKED IN RED INK BY CM AS A PROPERTY OF INTERNATIONAL RADIO CORP. DISTRIBUTION CONTROLLED COPY, COPIES OF THESE DOCUMENTS AND SHALL NOT BE REPRODUCED, COPIED OR USED AS C 201232-SCH A INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR K DEVICES WITHOUT PERMISSION. ARE FOR REFERENCE ONLY. FILENAME: SCALE : NONE PROJ NO. 533 SHEET OF

12 345 67 89101112 C_L_SHT1_A.DOT REV. A

Schematic Diagram: FM Chassis Interconnect

6-26 Adjustments and Tests FM30/150/300 User’s Manual Section 7—Service and Support

We understand that you may need various levels of support or that the product could require servicing at some point in time. This section provides information for both of these scenarios.

Service and Support 7-1 7.1 Service

The product warranty (see opposite page) outlines our responsibility for defective products. Before returning a product for repair or replacement (our choice), call our Customer Service department using the following telephone number:

(866) 262-8917

Our Customer Service Representative will give you further instructions regarding the return of your product. Use the original shipping carton or a new one obtained from Crown. Place shipping spacers between the slide-out power amplifier assembly and the back panel. Please fill out the Factory Service Instructions sheet (page 7–5) and include it with your returned product.

7.2 24–Hour Support

In most instances, what you need to know about your product can be found in this manual. There are times when you may need more in-depth information or even emergency-type information. We provide 24–hour technical assistance on your product via a toll telephone call. For emergency help or detailed technical assistance, call

(866) 262-8917

You may be required to leave a message at this number but your call will be returned promptly from our on-call technician.

7.3 Spare Parts

To obtain spare parts, call Crown Broadcast Sales at the following number. (866) 262-8919

You may also write to the following address:

International Radio and Electronics Corporation

P.O. Box 2000

Elkhart, Indiana, U.S.A. 46515-2000

7-2 FM30/FM150/FM300 User’s Manual Crown Broadcast Three Year Limited Product Warranty

Summary Of Warranty Crown Broadcast IREC warrants its broadcast products to the ORIGINAL PURCHASER of a NEW Crown Broadcast product, for a period of three (3) years after shipment from Crown Broadcast. All products are warranted to be free of defects in materials and workmanship and meet or exceed all specifications published by Crown Broadcast. Product nameplate with serial number must be intact and not altered in any way. This warranty is non - transferable. This warranty in its entirety is the only warranty offered by Crown Broadcast. No other warranties, expressed or implied, will be enforceable.

Exclusions Crown Broadcast will not warranty the product due to misuse, accident, neglect and improper installation or operation. Proper installation included A/C line surge suppression, lightning protection and proper grounding of the entire transmitter, and any other recommendations designated in the Instruc- tion manual. This warranty does not extend to any other products other than those designed and manufactured by Crown Broadcast. This warranty does not cover any damage to any accessory such as loads, transmission line or antennas resulting from the use or failure of a Crown Broadcast transmitter. Warranty does not cover any loss of revenue resulting from any failure of a Crown Broadcast product, act of God, or natural disaster.

Procedure for Obtaining Warranty Service Crown Broadcast will repair or service, at our discretion, any product failure as a result of normal intended use. Warranty repair can only be performed at our plant facility in Elkhart, Indiana USA or at a factory authorized service depot. Expenses in remedying the defect will be borne by Crown Broad- cast, including two-way ground transportation cost within the continental United States. Prior to returning any product or component to Crown Broadcast for warranty work or repair, a Return Authori- zation (RA) number must be obtained from the Crown Broadcast Customer Service Department. Product must be returned in the original factory pack or equivalent. Original factory pack materials may be obtained at a nominal charge by contacting Crown Broadcast Customer Service. Resolution of the defective product will be made within a reasonable time from the date of receipt of the defective product.

Warranty Alterations No person has the authority to enlarge, amend, or modify this warranty, in whole or in part. This warranty is not extended by the length of time for which the owner was deprived the use of the product. Repairs and replacement parts that are provided under the terms of this warranty shall carry only the unexpired portion of the warranty.

Product Design Changes Crown Broadcast reserves the right to change the design and manufacture of any product at any time without notice and without obligation to make corresponding changes in products previously manufactured.

Legal Remedies of Purchaser This written warranty is given in lieu of any oral or implied warranties not covered herein. Crown Broadcast disclaims all implied warranties including any warranties of merchantability or fitness for a particular purpose.

Crown Broadcast 25166 Leer Drive Elkhart, Indiana 46514-5425, Phone: (574) 262-8900, Fax: (574) 262-5399 www.crownbroadcast.com

Service and Support 7-3 The following lists describe the spare parts kit available for your transmitter.

For the FM150 and FM300, use part number GFMSPARES.

The following parts are included:

Item Quantity Fuse, 4A Slo-blo 5mmX20mm 6 Fuse, 6.3A Slo-blo 5mmX20mm 5 Fuse, 12.5A Slo-blo 5mmX20mm 5

15A 100V N-CH MOSFET 2 130V RMS 200V PEAK 6500A 2 ZENER 35A 400V Bridge Rectifier 1 Diode, BYV72E–150 20A 150V 2

MOS Gate Driver, 500V IR #IR2125 2 MOSFET, RF SD2942 1 Switching Regulator, 0.75A LM3578AN 2 NTC, In-rush Current Limiter 2

EMI Filter, 6A 250V with Fuse 1 14 Stage Bin Cntr/OSC 74HC4060 1

These parts are included in the FM30 kit (part number GFM30SPARES):

Item Quantity Fuse, 1.5A Slo-blo 5mmX20mm 6 Fuse, 3A Slo-blo 5mmX20mm 5

15A 100V N-CH MOSFET 2

130V RMS 200V PEAK 6500A 2 ZENER 35A 400V Bridge Rectifier 1 Diode, BYV72E–150 20A 150V 2

MOS Gate Driver, 500V IR #IR2125 2

BLF245 FET PWR Transistor 1 Switching Regulator, 0.75A LM3578AN 2 NTC, In-rush Current Limiter 2

EMI Filter, 6A 250V with Fuse 1 14 Stage Bin Cntr/OSC 74HC4060 1

7-4 FM30/FM150/FM300 User’s Manual Factory Service Instructions

To obtain factory service, complete the bottom half of this page, include it with the unit, and ship to:

International Radio and Electronics Corporation 25166 Leer Drive Elkhart, Indiana, U.S.A. 46514-5425

For units in warranty (within 3 years of purchase from any authorized Crown Dealer): We pay for ground UPS shipments from anywhere in the continental U.S. and Federal Express Second Day service from Hawaii and Alaska to the factory and back to you. Expedited service/shipment is available for an additional charge. You may forward your receipt for shipping charges which we will reimburse. We do not cover any charges for shipping outside the U.S. or any of the expenses involved in clearing customs.

If you have any questions about your Crown Broadcast product, please contact Crown Broadcast Customer Service at: Telephone: (866) 262-8917 or (866) 262-8919 Fax: (574) 262-5399

Name: Company:

Shipping Address:

Phone Number: Fax:

Model: Serial Number: Purchase Date:

Nature of the Problem (Describe the conditions that existed when the problem occurred and what attempts were made to correct it.)

Other equipment in your system:

If warranty has expired, payment will be: Cash/Check VISA Mastercard Please Quote before servicing

Card Number: Exp. Date: Signature:

Return Shipment Preference if other than UPS Ground: Expedite Shipment Other

ENCLOSE WITH UNIT—DO NOT MAIL SEPARATELY

Service and Support 7-5 Appendix

Transmitter Output Efficiency

RF Power Output-FM 30

PADC Volts PADC Amps RF Power Efficiency 27.9 2.16 34 56

26.2 2.09 32 58

24.7 2.02 30 60

22.5 1.91 26 60

20.2 1.77 22 62

17.0 1.56 17 64

14.1 1.34 14 74

12.6 1.22 10 65

10.5 1.04 7 64

8.8 .88 5 65

6.6 .65 3 70

5.4 .53 2 70

Power measurements were made at 97.1 MHz. Voltage and current measurements were taken from the unit’s built-in metering. The accuracy of the internal metering is better than 2%. Return loss of the RF load was greater than –34 dB at test frequency .

A-1 FM30/FM150/FM300 User’s Manual Transmitter Output Efficiency

RF Power Output-FM 150

PADC Volts PADC Amps RF Power Efficiency 34.3 6.05 165 79.5 32.8 5.87 150 77.9 28.4 5.34 113 74.5 23.1 4.77 75 68.1 16.4 4.09 38 56.7 9.4 3.16 15 50.5

Power measurements were made at 97.9 MHz. Voltage and current measurements were taken from the unit’s built-in metering. The accuracy of the internal metering is better than 2%. Return loss of the RF load was greater than –34 dB at test frequency .

RF Power Output-FM 300

PADC Volts PADC Amps RF Power Efficiency 48.5 7.86 330 86.6 46.3 7.57 300 85.6 40.2 6.75 225 82.9 33.0 5.80 150 78.4 23.4 4.70 75 68.2 14.5 3.79 30 54.6

Appendix A-2 Notes:

A-3 FM30/FM150/FM300 User’s Manual

Glossary

The following pages define terms and abbreviations used throughout this manual.

Glossary G-1 AF Audio Frequency; the frequencies between 20 Hz and 20 kHz in the electromagnetic spectrum

ALC Automatic Level Control

AM Amplitude Modulation; the process of impressing information on a radio-frequency signal by varying its amplitude.

Bandwidth The range of frequencies available for signaling.

BCD Binary-Coded Decimal; a digital system that uses binary codes to represent decimal digits.

BFO Beat Frequency Oscillator

BNC A bayonet locking connector for miniature coax; said to be short for Bayonet-Neill-Concelman.

Broadband As used in the FM transmitter; refers to the entire audio spectrum as opposed to the spectrum influenced by the pre-emphasis; also called “Wideband”.

Carrier A continuous signal which is modulated with a second; information– carrying signal.

Crosstalk In FM broadcasting, the term generally refers to the interaction between the main (L+R) and the subcarrier (L_R) signals as opposed to “separation” which generally refers to leakage between left (L) and right (R) channels.

Density (program) A high average of modulation over time.

Deviation The amount by which the carrier frequency changes either side of the center frequency.

DIP Dual In-line Pins; term used to describe a pin arrangement.

Distortion The unwanted changes in signal wave shape that occur during transmission between two points.

DPM Digital Panel Meter

EPROM Erasable Programmable Read Only Memory

Exciter (1) A circuit that supplies the initial oscillator used in the driver stage. (2) A transmitter configuration which excludes stereo generation and audio processing.

G-2 FM30/FM150/FM300 User’s Manual FET Field-Effect Transistor

Frequency Synthesizer A circuit that generates precise frequency signals by means of a single crystal oscillator in conjunction with frequency dividers and multipliers.

FM Frequency Modulation; the process of impressing on a radio signal by varying its frequency.

FSK Frequency Shift Keying; an F technique for shifting the frequency of the main carrier at a Morse code rate. Used in the on-air identification of frequencies.

Gain Reduction The process of reducing the gain of a given amplifier.

Harmonics Undesirable energy at integral multiples of a desired, fundamental frequency.

High Frequency Frequencies in the 3.0 to 30.0 MHz range.

Highband Frequencies affected by the pre-emphasis.

I/O Input/Output

LED Light Emitting Diode

Modulation The process by which a carrier is varied to represent an information-carrying signal.

MOSFET Metal Oxide Semiconductor Field Effect Transistor; A voltage-controlled device with high input impedance due to its electrically isolated gate.

Nearcast A transmission within a localized geographic area (ranging from a single room to several kilometers)

PA Power Amplifier

PAI Power Amplifier Current

PAV Power Amplifier Voltage

Pilot A 19-kHz signal used for stereo transmissions.

Pre-emphasis The deliberate accentuation of the higher audio frequencies; made possible by a high-pass filter.

Processing The procedure and or circuits used to modify incoming audio to make it suitable for transmission.

Receiver An option which adds incoming RF capability to an existing transmitter. See also “Translator.”

Glossary G-3 RF Radio Frequency; (1) A specific portion of the electromagnetic spectrum between audio-frequency and the infrared portion. (2) A frequency useful for radio transmission (roughly 10 kHz and 100,000 MHz).

SCA Subsidiary Communications Authorization; see “subcarrier.”

S/N Signal to Noise

Spurious products Unintended signals present on the transmission output terminal.

Stability A tolerance or measure of how well a component, circuit, or system maintains constant operating conditions over a period of time.

Stereo Pilot See “Pilot.”

Stereo separation The amount of left channel information that bleeds into the right channel (or vice versa).

Subcarrier A carrier signal which operates at a lower frequency than the main carrier frequency and which modulates the main carrier.

Suppression The process used to hold back or stop certain frequencies.

SWR Standing Wave Ratio; on a transmission line, the ratio of the maximum voltage to the minimum voltage or maximum current to the minimum current; also the ratio of load impedance to intended (50 ohms) load impedance.

THD Total Harmonic Distortion

Translator A transmitter designed to internally change an FM signal from one frequency to another for retransmission. Used in conjunction with terrestrial networks.

Satellator A transmitter equipped with an FSK ID option for re-broadcasting a satellite fed signal.

VSWR Voltage Standing Wave Ratio; see “SWR.”

Wideband See “Broadband.”

VCO Voltage Controlled Oscillator

G-4 FM30/FM150/FM300 User’s Manual Index Symbols C 19–kHz Cables level adjustment 5–3 audio input 2–13 phase adjustment 5–3 Carrier 4–12,5–8 automatic turnoff 2–16,3–8,5–6,5–10 A frequency 5–8, 5-10 AC. See Power: input Carrier switch 3–4,5–5 ALC 3–3,3–7,4–7 Channel. See Frequency Altitude main 5–10 operating range 1–8 main into sub 5–10 Amperes PA DC 3–3,3–8 sub into main 5–10 Amplifier Chassis RF 4–13 circuit 4–14 bias set 5–6 Circuit boards Antenna 2–12 audio processor 4–3,6–5 mismatch 3–3 stereo generator 4–4, 6-5 Applications 1–3 Circuits Audio chassis 4–14 broadband 3-5 display 4–10 distortion 5–9 metering 4–8 frequency 5–8 motherboard 4–8 high 3–5 part numbering 4–2 input connectors 2-13, 4–3 power regulator 4–12 input level 1-7, 3–5 RF exciter 4–6 monitor connections 2–15,4–5 stereo generator 4–4 performance 5–7 voltage regulator 4–11 pre-emphasis 3–5 Components processing 3–5,4–10 numbering 4–2 wide 3–5 Composite Audio processor 4-3 input 2–14 adjustments 5–2 input connection 2–13 circuit description 4–3 output adjustment 5–3 circuit location 6–3 Connectors indicators 3–5 audio input 2–13 input 3–5 audio monitoring 2–15 reference drawings 6–5 composite in 2–15 remote I/O 2–16 B RF input 2–12 Backup RF output 2–12 transmitter use 1–4 RF output monitoring 2–12 Bandwidth SCA In 2–14 RF 5–8 XLR 2–13, 4–3 Battery. See power: input Cooling Fan 3-3, 3-8 Bias set 5–6 control 4-7 Broadband. See Audio: broadband Coverage area 1-4 Crosstalk 1-7 measurements 5-9 Current limit PA 5-5

Index I-1 D Gain reduction 4-3 DC. See Power: input Gain switches De-emphasis 2-15, 5-2, 5-7 input 3-6 jumpers 2-15 Delay H program failure to carrier turnoff 2-16, 5-6 Harmonic distortion 4-5 Dimensions 1-9 Harmonics 5-8 Display Heatsink 3-8 circuit description 4-10 Highband 3-5 front panel 3-2, 3-5, 3-7 processing 4-4 modulation calibration 5-5 Humidity Distortion 1-7 operating range 1-8 audio 5-9 harmonic 4-5 I E I/O connector 1-2, 2-14 Emissions 5-8 pin out 2-16, 2-17 Exciter. See RF exciter Indicators configuration 1-4 audio processor 3-5 fault 3-8, 4-10 F highband 3-5 Fan (PA) LED 3-5, 3-7, 4-10 control 4-7 pilot 3-5 cooling 3-8 wideband 3-5, 5-6 Fault Input indicators 4-10 audio connectors 2-13 input 3-8 composite 2-14 lock 3-8 fault 3-8 power 3-8 gain switches 3-6 servicing 3-8 program SWR 3-8 fault 2-16 temperature 3-8 SCA connection 2-14 FCC guidelines 1-9, 5-8, 5-10 Frequency L carrier 5-8, 5-10 Labels 1-10 measurement 5-4 LEDs 3-5, 4-10 pilot 5-8 Line voltage 2-2, 2-3 receiver 2-8 Lock response 5-8 status 4-6 selection 2-5, 5-3 Lock fault 3-8 receiver 2-8 samples 2-6 M synthesizer 5-10 Metering 1-3 Frequency synthesizer. See RF exciter circuit description 4-7 adjustments 5-4 Metering circuit Front panel adjustments 5-4 display modulation calibration 5-5 location 4-7 FSK 1-5, 1-6 Modulation 2-12, 3-5, 5-3, 5-7, 5-8 measurements 5-4 calibration 5-5 Fuses 2-4, 7-4 compensator 2-7 display 3-5 G percentage 3-5, 5-9 Gain control 3-5 Monitor audio 2-15, 4-5

I-2 FM30/FM150/FM300 User’s Manual M (continued) Processing Mono audio 1-2, 3-5 operation 2-13, 3-6 control 3-6 Motherboard control setting 3-3 circuit description 4-8 highband 3-5, 4-4 Multimeter 3-7 Program failure 2-16, 5-10 front panel 3-3 Program source 2-13, 3-6

N R Nearcast Receiver transmitter use 1-6 frequency selection 2-8 Networks option 1-5 satellite fed 1-6 specifications 1-10 terrestrial fed 1-5 Reflectometer 4-14 Noise 1-8, 3-8 Regulatory approvals 1-9 measurements 5-9 Remote control 1-2 Remote I/O O connector 2-16 Operating environment 1-8, 2-2 pin out 2-17 Options 1-3, 1-4, 1-6 Remote operation 2-16 Output Repair power 1-7, 3-7 warranty 7-3 display 3-7 RF Output filter 4-14 amplifier 4-13 bias set 5-6 bandwidth 1-8, 5-8 P exciter 1-3, 2-12 Part numbering 4-2 circuit description 4-6 Parts circuit location 1-3, 4-6 spares 7-2 input 1-5, 2-12 Performance output 1-2, 1-5, 1-7, 3-3, 3-7 checklist 5-7 impedance 1-7 tests 5-10 output filter 4-14 Pilot frequency 5-8 Pilot indicator 3-5 Power S AC supply 4-14 Safety 1-10 AC voltage selection 2-2 Satellator battery 1-4, 1-8, 2-5 transmitter use 1-6 failure 2-2 SCA 1-5 fault 3-8 input connection 2-14 input 1-8, 2-2, 2-5 Sensitivity FCC guidelines 5-10 monaural 1-10 output 1-3, 1-7, 5-8 stereo 1-10 display 3-7 Separation output filter 4-14 stereo 1-7 regulator stereo generator 5-2 circuit description 4-12 Service RF 3-3, 3-7 warranty 7-3 RF amplifier 4-13 Service instructions 7-5 transformer 4-14 Spares kit 7-4 Power switch 3-4 Specifications Pre-emphasis 1-7, 4-4, 5-2, 5-7 receiver 1-10 curve 2-15, 4-4 transmitter 1-7

Index I-3 S (continued) VSWR 1-2, 2-12 Stand alone transmitter use 1-4 W Stereo Warranty 7-3 separation 1-7, 5-9 Weight 1-9 Stereo generator 1-2, 2-14 Wideband 3-5 adjustments 5-2 bypassing 2-14 X circuit description 4-4 XLR connectors 2-13 circuit location 6-3 Subcarrier 5-10 38kHz 5-10 Suppression subcarrier 1-8 Switches carrier 3-3, 3-4, 5-5 input gain 3-5, 3-6 power 3-2, 3-4 receiver 2-8 stereo-mono 3-3, 3-6 SWR 3-7 calibrate 5-5 fault 3-8 Synchronization 4-11 Synthesizer, See RF exciter

T Temperature fault 3-8 operating range 1-8, 5-10 PA 3-3, 3-8 Test point voltage 3-8 Tests performance 5-7, 5-10 Time-out program input failure 2-16 Transformer 4-14 Translator transmitter use 1-5

V VCO 4-6 Voltage AC selection 2-2 Voltage regulator 3-8 adjustments 5-6 circuit description 4-11 Voltage selection 2-2 Voltmeter display 3-8 Volts PA DC 3-3, 3-8

I-4 FM30/FM150/FM300 User’s Manual