HAMTRONICS® AP-3 MODULE: INSTRUCTION MANUAL

and the receiver squelch is closed. preventing transistor damage. C8 is FUNCTIONAL DESCRIPTION. Therefore, the radio station using the a bypass for low frequency rf which The Autopatch Module is used has control over what parts may be present on the line. with the DTMF Decoder/Controller of the incoming telephone DTMF tones from either the phone Module to provide the following conversation goes out over the air: line or the receiver are applied to the functions: repeater autopatch, any time the radio operator keys his DTMF De coder/Controller Module reverse autopatch, primary phone microphone, the receiver squelch through E8. line remote control of repeater, phone cuts off the telephone audio at U1-D. line monitor of repeater receiver, and Logic Circuits. C10 prevents switching clicks from secondary remote control through When the DTMF De - occurring when a dc signal is applied repeater receiver. coder/Controller Board applies a through R12 or R13. The 220 pf The Autopatch Module can be ground signal to E13, two things capacitors at various input and output interfaced directly with any touchtone happen. First, switch Q1 turns on, terminals of the board are to bypass telephone line. It is registered with thereby applying a positive signal to vhf/uhf rf energy. the FCC under part 68. the COR input on the COR Board. Audio from the repeater receiver This turns on the repeater enters at E7. Some of this audio is HOW IT WORKS. transmitter. Second, the ground applied through R16 and mixer U1-C Refer to the schematic diagram signal at E13 is applied to or-gate U1- and E9 to the transmit audio input and the repeater block diagram dur- A, which energizes relay K1 through circuit on the COR board. Because of ing the following discussions. switch U1-B. R32, CR3, and C26 in the squelch action in the receiver, the line to U1-A provide a time delay Phone Line Interface. audio is present only when a station of about one second between the time The phone line is connected to E1- is heard on the receiver. Thus, the DTMF Board commands the E2. Relay K1 completes a path to dc receiver audio does not interfere with autopatch to turn on and the time the load resistors R6/R7 and to isolation audio coming from the telephone line. relay actually energizes. This transformer T1 via high voltage Q5 acts as a switch to mute the prevents the tail end of the last digit capacitor C5. When the phone patch audio at the input of U1-C whenever in the sequence which energizes the relay is activated, the dc current the DTMF Decoder/Controller Board autopatch from being applied to the drawn by R6/R7 "seizes" the phone applies a signal indicating that tones telephone line and thereby being line, and T1 couples audio in and out are being received. This prevents construed by the of the line. When the phone line is tones from being repeated on the as the first digit in the telephone "on-hook", any incoming ac ringing transmitter. Capacitor C15 works in number. voltage is coupled through capa citors conjunction with a diode on the TD-2 The phone patch relay also can be C6 and C99 to opto-coupler U2. When DTMF De coder/Controller Board to activated by timer U3. If someone the opto-coupler senses a ringing provide a fast-attack/slow-release calls in on the phone line, opto- voltage on the line, it trips timer U3. time constant for the mute switch. coupler U2 detects the ringing Receiver audio is applied through Audio Paths. voltage, and U3 activates the relay for potentiometer R1 to line driver Q4, When the autopatch is enabled, about 60 seconds. This is sufficient which amplifies the signal and drives relay K1 connects the telephone line time to give a tone command or listen the telephone line through isolation to isolation transformer T1 through dc to the repeater receiver to hear what transformer T1. Bias for the stage is blocking capacitor C5. Phone line is on the input frequency. During the switched on by Q2 only when the re- audio is amplified in two successive 60 seconds, a tone command may be ceiver squelch is open. Because U1- op-amp stages. The repeat phone line given to turn the repeater or the D is off during this condition, the level is set by potentiometer R8. U1- autopatch on or off or to perform any amplified audio from Q4 is blocked D also acts as a switch: audio passes other function which the DTMF Board from the input of U1-C through this only when the autopatch is enabled is programmed to do. If the autopatch second path. (The high gain needed is turned on, of course, then it stays in U1-D for the weak phone audio on even after the 60 second period would cause distortion of the receiver HOW TO CONTACT US — elapses. audio if allowed to take the same path Hamtronics, Inc. The COR Module keying output at as the phone audio.) 65 Moul Rd; Hilton NY 14468-9535 E12 is activated by Q1 whenever the Phone: 716-392-9430 VR1/VR2 is a pair of back-to-back autopatch is turned on, as previously http://www.hamtronics.com zener diodes to absorb the inductive de scribed. It also is activated by Q2 email: [email protected] surge when Q4 is switched off, thus and Q3 via or-gate CR2 whenever the

©1998 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Revised: 11/27/01 - Page 1 - receiver squelch is open. This is the the new relay. Therefore, the lead of TABLE 1. CONNECTIONS BETWEEN manner in which the COR line is R33 closest to the relay no longer MODULES WHEN AP-3 IS USED WITH COR-4. activated when the autopatch is off, connects directly to the board. See SIGNAL RCVR TD-2 AP-3 COR during basic repeater operation. Q2 the detail to the left of the drawing. Rcvr Audio E2* E7 also switches bias to Q4, and Q3 The leads of C99 are bent so that one AP Audio Out E9 E12 switches bias to mute U1-D, goes down into the board where R33 Rcvr COS E4* E11 AP COR Out E12 E14 whenever the receiver squelch is originally connected. Do not trim the DTMF Rpt Inhibit "H" E16 open. (COS = carrier operated lead off. Instead, bend the C99 lead DTMF Tones "1" E8 switch). under the board and use it as a DTMF Mute "3" E10 jumper to connect to the second pad AP-ON Command "4" E13 CONSTRUCTION. *Note: Inside receiver enclosure, E2 and from the right of the row of five Assembly is fairly simple. Refer to E4 on the receiver module are connected to original relay pads, as shown in the feedthru capacitors C2 and C1, respectively. the parts list and the component loca- drawing. Solder the lead at both pads. tion diagram during construction. Install R33 on an angle as shown, TABLE 2. CONNECTIONS BETWEEN Caution: The pc board uses plated- with one lead tack soldered to the top MODULES WHEN AP-3 IS USED WITH through holes for easy construction. Sol- COR-3. lead of C99, as shown in the detail. dering need be done only on underside SIGNAL RCVR TD-2 AP-3 COR e. Install R28, and solder to the Rcvr Audio E2* E7 of board. However, because it is more board. Then, install C27, tack AP Audio Out E9 E6 difficult to unsolder plated-through Rcvr COS E4* E11 soldering its leads to the leads of R28. boards, be sure parts are in the correct AP COR Out "H" E12 E7 place before soldering. Be careful not to Observe polarity. DTMF Tones "1" E8 interchange parts which look similar, f. Install zener diodes VR1 and DTMF Mute "3" E10 AP-ON Command "4" E13 e.g., resistors with similar color codes. VR2 vertically with cathode bands up,

Be sure to observe polarity on as shown in the detail. Tack solder transistors, diodes, electrolytic the upper leads together. n. Check over construction to be capacitors, and ic's. g. Install the ic socket for U1 as sure all parts are installed in proper Note that the pc board was designed shown. The socket has a prominent places and with correct polarity on for a relay which is no longer available. notch in one end. Install the socket diodes and electrolytic capacitors. Therefore, some adaptations are to match the notch shown on the Check all solder connections for bad necessary to use another style of relay. diagram. Plug the 3301 ic into the joints, solder splashes, etc. a. Orient board as shown in the socket, being careful that no pins component location diagram. Be sure bend over. OPTION FOR NO REVERSE the proper side is up. h. Solder ic's U2 and U3 directly to AUTOPATCH. b. Locate relay K1, which is blue the board, orienting as shown. If you wish to prevent any reverse and has four leads. Cut four one inch i. Install transformer T1, and autopatch or calling into the lengths of #22 bus wire, and wrap the solder leads. Autopatch for control purposes, for ends around the relay leads as shown. j. Install potentiometers R1 and example, be cause you are using the Tack solder bus wires to relay leads. R8, checking parts list for proper family telephone line and you need to Be careful not to stress the relay values. have normal telephone operation, leads and break them. k. Install all other resistors and disconnect R33 to disable the ring c. Lay the relay down on the pc diodes according to diagram and parts detector. If you want to selectively board, and solder the bus wires to the list. Bodies of vertical parts are disable this function only at certain pads on the board as shown. Note indicated as circles on the diagram. times, use a front panel switch in that the old relay had two rows of five Observe polarity on diodes. Note that series with the resistor. large pads for its connections. The switching diodes may not be marked bus wires from the new relay connect except with a band. The zener diodes INSTALLATION. to four of those pads. Make sure you are marked with their part number, To simplify matters, we will use the correct ones. and they should be installed as shown discuss the normal installation in a d. Find R33 and C99 from the in the detail with the cathode bands Hamtronics repeater system first; parts list and install them on the up and the cathode leads tack sol- then we will go into variations when board as follows. Note that the board dered together. using other equipment and options. was originally designed for R33 to be l. Install all other capacitors, It is assumed that you are using installed horizontally between two observing polarity on electrolytic our COR-4 module. An pads, as you might surmise from the types. interconnection block diagram and original parts location drawing. m. Install transistors, orienting as wiring table are supplied for use with However, it is necessary to connect shown. that module. If you are using our C99 in series with R33 in order to use

©1998 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Revised: 11/27/01 - Page 2 - earlier COR-2 or COR-3 modules, a motor of a tape recorder for logging, to SPST switch in series with the AP-ON table is also supplied for those activate the AP-2 Timing Board in a line from the DTMF interconnections. simplex autopatch system, or to Decoder/Controller Module to E13 on a. Attach the Autopatch module perform any other auxiliary switching the Autopatch Module. When the with standoffs in the four corner function you may wish to have. They switch is open, the patch cannot be holes. It is recommended that the normally are not connected in a basic brought up by anyone on the air or on module be shielded from high level rf; repeater setup. the phone. however, in a repeater, the g. E7 should be connected to the b. If a DTMF Module other than transmitter already is shielded, so audio output feedthru capacitor on our model TD-2 is used, it is unlikely this requires no extra attention. the repeater receiver enclosure, that a tone mute signal will be b. Use hookup wire for all connec- which is connected to the E2 available for pin E10. In that case, tions, and neatly bundle with other "speaker" output of the receiver just leave E10 disconnected. cabling. Table 1 lists the connections board. E9 should be connected to c. If another receiver is used, it be tween modules to add the audio input: terminal E12 on the must provide 1.5V p-p audio (the Autopatch and DTMF Decoder/Con- COR-4 module (or terminal E6 on the equivalent of 50 mW of audio into an troller Modules to the basic repeater COR-2 or COR-3 module). The re- 8 ohm speaker). It must also provide configuration using the COR-4 board. ceiver would normally connect a COS signal of at least +4Vdc when Note: If you are connecting the directly to the COR module if the the receiver squelch is open and Autopatch in an existing repeater, be Autopatch was not used. ground (less than 1V) when the sure that you disconnect the original h. Connect E8 to terminal 1 of the squelch is closed. audio and cos connections to the COR TD-2 DTMF Decoder/Controller Mod- d. If a different COR Module is board before connecting the ule. This provides DTMF tones to the used, it must have a high impedance Autopatch. We have had some TD-2 Board. (greater than 10K audio input customers mistakenly leave the old i. Connect E10 to terminal 3 of impedance) and operate with 1.5V p-p connections direct from the receiver the TD-2 DTMF Decoder/Controller audio level at full modulation. The to the COR board, and this causes Module. This is the mute output of COR control input should be the incorrect operation which is difficult the TD-2 Board, which mutes the equivalent of a transistor base- to diagnose. The audio and COS repeater when tones are present. emitter junction or a CMOS input, signals from the receiver to the COR j. Connect E11 to the COS output with hi = COR-on and lo = COR-off. Board are processed through the Au- feedthru capacitor of the receiver e. If a different DTMF De cod- topatch Board; so they would not be enclosure. Inside the enclosure, this er/Controller Module is used, it must connected directly to the COR Board feedthru capacitor is connected to E4 operate with 2V p-p max. tone input when an Autopatch is in the system. on the receiver. (The COS output of level; and the autopatch control c. Connect E1 and E2 with a the receiver would normally be output must be ground = on and open twisted pair to two spare terminals on connected directly to the COR Board if = off. If it is also to inhibit the rear of repeater. These will be used the Autopatch was not installed.) repeater COR as a second function, it for connection to the phone line when k. Connect E12 to COS input E14 must have ground = off and open = on wiring is completed. Tip and ring on the COR-4 module (or E7 on the for that function. polarity may be interchanged; the COR-2 or COR-3 Module). CAUTION: Phone lines are notori- Autopatch phone line input is non- l. Connect terminal "H" of the TD- ous collectors of static charges from polarized. 2 DTMF Decoder/Controller Module to lightning, etc., and high enough d. The ground plane on the pc E16 on the COR-4 module (or E7 on charges can damage any electronic board is already grounded if mounted the COR-2 or COR-3 Module). Termi- circuitry. The phone company to metal chassis. If not, be sure to nal "H" inhibits the COR Board from normally puts lightning arrestors on connect power and signal ground to a keying the transmitter when the the service line at the house, but solder lug added under one of the repeater is turned off by tone these are primarily carbon fuses to mounting screws. command. prevent fires. If you are in an area e. Connect E3 to source of filtered m. Connect E13 to terminal 4 of with frequent lightning strikes, you and regulated +13.6Vdc. If you are the TD-2 DTMF Decoder/Controller may need to install a gas discharge using the COR-4 module, the B+ Module. device or similar protector on the should be obtained from E4. Do not phone line and connect to a good OPTIONS. apply power yet. ground. These are available from a. If you would like to have a front f. Solder pads E5 and E6 at the left telephone supply companies. In any panel control to inhibit phone patch side of the relay provide normally- case, be sure to have a good safety operation at times while leaving open relay contacts to operate the ground for the chassis. other functions intact, connect a

©1998 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Revised: 11/27/01 - Page 3 - SYSTEM ADJUSTMENTS. to E13 to bring up the patch and get a loud. The limiter in the transmitter Following is a first-time, fire up dial tone. (This should provide audio will prevent over-deviation on the and system audio level adjustment which normally would be the louder phone calls, but if the gain is procedure. It is assumed that all the maximum level ever to be applied to set too high, the audio on the louder other modules, including the DTMF the transmitter.) With dial tone calls may be running into limiting Decoder/Controller, have already present, adjust phone repeat level most of the time and sound too loud. been aligned or tested and control R8 on the Autopatch Module After using the autopatch for a time, programmed and that the system was for 5 kHz deviation. This sets up the you may want to turn R8 up or down a working before the Autopatch was audio gain for telephone audio going little. Since R8 does not affect the installed. Otherwise, troubleshooting out over the transmitter. If the dial setting of the limiter in the transmit- can be complicated. tone times out at the central office, ter, you can tweak it easily without When Autopatch is used in a release and remake the ground needing test equipment. repeater, the repeater audio is adjusted connection to E13 to get a fresh dial The phone company normally does differently. Therefore, the following tone. not like to have a level higher than audio setup instructions take d. Disconnect the phone line from about -3 dBm applied to their lines in precedence over any in manuals for the input terminals, and connect a order to prevent crosstalk to other other modules. scope or ac voltmeter across the phone lines. This translates to about It is assumed that the AP-3 is in- phone line terminals of the 2 V p-p. stalled in a Hamtronics repeater or Autopatch. Set the input to the In order to measure the phone used with Hamtronics modules to receiver for a 1000 Hz tone at 5 kHz line level with a scope, it is necessary make a repeater. If not, the deviation. With E13 still grounded, to disconnect the phone line and instructions below can be adapted for adjust line drive level control R1 for measure across the terminals of the your particular system. 2V p-p across the Autopatch phone Autopatch because you don't want to Note that when power is first line terminals. This sets the audio ground one side of the phone line. applied, the circuit which answers a applied to the phone line to about -3 This may cause a small inaccuracy phone call for reverse autopatch may dBm with full receiver audio. Re move due to the removal of the load latch up and require a one minute ground from E13. impedance from the Autopatch wait for it to turn off the telephone This completes the adjustments. Fol- terminals, but not enough to worry line relay. This is normal and should lowing is a discussion of what the about. If you have a battery operated not be a concern. affects are of each adjustment in case ac voltmeter, it may be connected a. Obtain a 1000 Hz test signal on you prefer different settings. across the phone line, but since it the receiver with 3 kHz deviation. The repeater receiver has crystal measures rms voltage instead of true Set the RPT VOL control (receiver filters which limit the input deviation peak-to-peak, you must use a single- volume control) for midrange to get a to the receiver; so it is not necessary tone sine wave for the test and moderately strong audio signal for the to use the transmitter limiter for calculate p-p voltage by multiplying transmitter. On the exciter, set the normal repeat operation. However, the rms voltage by 2.8. mic. gain control fully clockwise, and the limiter is needed to prevent high If the line level is set too high, adjust the deviation limiter control to deviation levels on telephone audio, cross talk results. If too low, your limit at about 5.5 kHz deviation so it since the level on phone lines varies DTMF tones may not be strong isn't quite limiting in normal so much. Indeed, it is desirable to enough to break the dial tone or dial operation. This sets up the limiter to run into limiting occasionally with reliably. be used with telephone audio only. telephone audio in order to get some Another factor to consider is that b. Connect an oscilloscope or ac compression to compensate for some the DTMF Decoder/Controller Board voltmeter to the audio output feedthru weaker telephone connections, may not decode some or all the digits capacitor (center ft cap) on the rear of thereby bringing up the average tele- properly if the level applied to it is too the receiver enclosure, and adjust phone audio level. So, a good compro- high or too low. This level is affected the RPT VOL control (receiver volume mise is to run the limiter for hard by the setting of the line drive level control) for 1.5 V peak-to-peak (p-p). limiting at about 5.5 kHz deviation so with R1 on the Autopatch Board. The Set the exciter mic. gain control that no limiting occurs with a normal decoder chip has a fairly wide for 3 kHz deviation out of the 5 kHz receiver input. dynamic range of tone level transmitter (3 kHz at receiver and 3 You may want to experiment a acceptance; however, tones from the kHz on transmitter). This sets up the little with the setting of phone repeat receiver will be relatively strong deviation for normal repeater level control R8. You want to be able compared to the weaker telephone operation without autopatch. to comfortably hear weaker phone tones, so you don't want to crowd c. Temporarily connect a ground audio but not have the ordinary local either end of the dynamic range. It calls be so strong that they are too

©1998 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Revised: 11/27/01 - Page 4 - may be necessary to readjust R1 repeater receiver, and try dialing an is your turn to speak. Be sure to slightly if a problem occurs operating outside call from a mobile station. inform the party you call that he is on reliably with either the phone See Operating Instructions for the air, and explain any rules you company central office tone decoders complete procedure. think he should understand. Note or the DTMF Decoder/Controller that you can block anything the party OPERATION. Board. on the phone says over the air merely Note: Before reading this section, Another factor affecting reliable by keying your transmitter. Although refer to DTMF Decoder/Controller In- operation of tone decoders is twist, the repeater carrier stays on the air, struction Manual Operating Pro- which is the relative levels of the the audio is muted anytime the re- cedures. high and low tones in any digit. ceiver squelch is open. This allows Also note that when power is first Modern tone decoder chips used in you to censor the other party. applied, the circuit which answers a the DTMF Board and the telco central The Autopatch will stay up until phone call for reverse autopatch may office tolerate about 10 dB of twist. (It you release it by sending the required latch up and require a one minute is common practice to run the high digit sequence. When the repeater wait for it to turn off the telephone tones just a little stronger than the carrier drops, you know you have line relay. This is normal and should low tones in driving the phone line to successfully knocked down the patch. not be a concern. compensate for the greater attenua- The repeater time-out timer will tion of high tones on long phone How to Make an Autopatch Call shut down the carrier if the patch is lines.) from a Mobile Station. held too long. To reset repeater time- Key the transmitter, and send the out timer, someone must send SYSTEM CHECKOUT. digits on the tone pad required to acti- required tone sequence to turn off the After alignment, you may want to vate the autopatch. Be careful not to autopatch. Then, normal operation perform the following procedure to hold the last digit too long, because can resume. verify that everything functions any tones present when the phone properly. How to Control the Repeater. line is connected will be counted by a. Try operating the repeater with The repeater may be enabled or the phone exchange as a digit the autopatch turned off, and verify disabled by sending the required entered as a phone number. There is that the transmitter deviation is repeater control digit sequence, a one-second delay before the phone about the same as the receiver input either through the repeater receiver line is connected to minimize this deviation. or via into the possibility. b. Try the various tone codes to autopatch line from a touch-tone The repeater audio is muted for a ensure that the DTMF Decoder/Con- phone. If power to the repeater is few seconds each time a DTMF digit troller responds normally to control turned off for any reason, when power is received; so there is a short delay codes transmitted over the air. Refer is resumed, the DTMF De cod- after the last digit of the command to instruction manual for that module er/Controller Module automatically sequence be fore you will hear audio for operating procedure. enables the repeater and turns off the again if you unkey your microphone. c. Dial up phone line from an out- autopatch. The complete sequence of digits side phone. Listen on the phone to Anyone with the proper phone required to bring up the patch must hear the repeater receiver. Try number and codes can call into the be sent within 5 seconds, or the turning the repeater on and off with autopatch line from any telephone decoder circuit resets and you must the proper DTMF digits sent from the and receive access for one minute, start over. telephone. Do not turn on the during which time he can listen to After bringing up the patch, autopatch function; just listen to the the repeater receiver (whether the release the transmitter keyline, and receiver, and verify that the one- transmitter is enabled or not). This listen for dial tone. If you don't hear minute timer disconnects the phone is handy for a controlling ham to it, try again. If you hear the phone line in about one minute. check on interference before bringing line noise but no dial tone, knock d. Dial up phone line again from up the repeater transmitter after a down the patch and bring it up again an outside phone. Enable the shut-down. During the one minute to get a dial tone. After you get a dial autopatch with the proper tone code period, the person on the phone also tone, key the transmitter and dial the sent from the telephone. Talk into has access to the tone de coders so he desired phone number. Then, re- the phone and verify that the audio can punch in tones to turn the lease transmitter and listen for sounds good through the repeater. repeater on or off or bring up the ringing. The transmitter deviation should be autopatch. When the called party answers, no greater than 5.5 kHz with full you can talk to him merely by Reverse Autopatch. audio (shouting into the phone). pressing push-to-talk button when it A party calling in to the autopatch e. Bring up the patch through the

©1998 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Revised: 11/27/01 - Page 5 - line can access the patch, just as the FCC registration number and ringer TROUBLESHOOTING. mobile radio operator can, if he/she equivalence number (REN). If If you have trouble, check each knows the control code sequence to requested, this information must be stage, and trace signals through the bring up the autopatch. He has 60 provided to the . circuit path. Following are charts of seconds to monitor the repeater, and 2. The ringer equivalence code dc voltages and audio signal levels at if not busy, to dial the required digit (REN) is used to determine the key points. Voltages are typical but sequence for autopatch access. He quantity of devices which may be may vary considerably without can then call the party he wishes to connected to the telephone line may necessarily indicating a problem. speak to by call letters just as if he result in the de vice not ringing in When troubleshooting a unit was using a radio. If the party response to an incoming call. In which has just been built, be sure to addressed on the air does not respond, most, but not all areas, the sum of the check for solder splashes, bad solder the calling party must knock down REN's should not exceed five (5.0). To joints, parts mixed up, etc. It is easy the patch by sending the required be certain of the number of devices to have something like that happen digit sequence to turn it off. that may be connected to the line, as during construction. Note that the repeater trustee is determined by the total REN's, contact Note that the sensitivity of the responsible to see that current FCC the telephone company to determine ring detector circuit has been set to requirements regarding licensing of the maximum REN for the calling operate reliably with most telephone such reverse autopatch users is area. central offices. If you have a problem observed. Since the calling party has 3. If this equipment, causes harm with the autopatch relay turning on control of the repeater carrier, legally, to the , the due to transient pulses on the phone he may be required to hold a valid telephone company will notify you in line when no ringing signal actually license. advance. But if advance notice is not occurred, the sensitivity may be Other Rules and Regulations. practical, the telephone company will reduced by reducing the value of R25. notify the customer as soon as It is beyond the scope of this Likewise, if the ring de tector doesn't possible. Also, you will be advised of discussion to address all the legal answer the phone quickly enough, your right to file a complaint with the problems involved in autopatch you may need to increase the value of FCC if you believe it is necessary. systems. The repeater trustee must R25. 4. The telephone company may be aware of current regulations. The time delay of timer U3 may be make changes in its facilities, equip- For example, any business use of adjusted by changing the value of ment, operations, or procedures that the autopatch is prohibited for any R27. Larger values make the delay could affect the operation of the reason by the "amateur" status of the longer, and smaller values make the equipment. If this happens, the repeater. Re peater trustees should delay shorter. telephone company will provide investigate and list all such advance notice in order for you to requirements for users be fore the DC TEST VOLTAGES REFERENCED TO make the necessary modifications in GROUND. autopatch is made accessible for order to maintain uninterrupted XSTR CONDITION EM BASE COLL general use. Q1 AP on 13.6 12.4 13.2 service. AP off 13.6 13.6 0.03 FCC Registration. 5. If trouble is experienced with Q2 Squelch Open 0 0.65 This device has been granted a this module, it must be repaired 0.13 Sq Closed 0 0 13.6 registration number by the Federal promptly. If the trouble is causing Q3 Squelch Open 13.6 12.6 Communications Commission, under harm to the telephone network, the Sq Closed 13.6 13.4 0.05 part 68 rules and regulations for telephone company may request you Q4 Squelch Open 8.3 7.5 direct connection to the telephone remove the equipment from the Sq Closed 13.6 13.6 0 Q5 Tones Present 0 0.65 lines. In order to comply with these network until the problem is resolved. 0.06 FCC rules, the following instructions If any questions on how to repair the Tones Absent 0 0* must be carefully read and applicable module, please consult factory for any * Indicates voltage charge may be held by portions followed completely. By law, additional troubleshooting capacitor and discharge slowly. these instructions must be provided information you may need or to make to you. arrangements for factory service . 1. This equipment complies with 6. This equipment must not be part 68 of the FCC rules. A label is used on telephone company provided provided below, which must be cut out COMPLIES WITH PART 68, FCC RULES public coin service. Connection to FCC Registration # 2T7USA-75643-OT-E and attached to the outside of the party lines is subject to state tariffs; MFR Model AP-3 AUTOPATCH MODULE equipment in which this module is contact your state public utility Ringer Equivalence 1.6A, 4.7B installed. This label contains the commission for information. Made In USA

©1998 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Revised: 11/27/01 - Page 6 - U1 pin 1 2 3 4 5 6 C15 2.2 uF electrolytic U3 off 0.03 0 - 0.09 13.0 0.12 C16 .001 uf (102, 1nM, or 1nK) U3 running 0.07 0.7 - 12.2 2.3 0.9 C17 1 uF electrolytic AP off 0.03 - 0.55 0.09 13.0 0.12 C18-C20 .001 uf (102, 1nM, or 1nK) AP on 0.07 - 0* 12.2 2.3 0.9 C21 47 uF electrolytic * Indicates voltage charge may be held by capacitor and discharge slowly. C22 not used C23-C24 .01 uf disc (103) U1 pin 7 13 14 C25 47 uF electrolytic All conditions 0 0 13.6 C26 1 uF electrolytic C99 0.15uF mylar (red) U1 pin 8 9 10 11 12 CR1-CR4 1N4148 switching diode K1 Reed relay (blue) Tones present 0.06 12.2 - - - Tones absent 0.55 6.2 - - - Q1 2N3906 or 2N4126 Sq open or AP off - - 12.2 0.05 0.55 Q2 2N3904 or 2N4124 Sq closed & AP on - - 7.4 0.55 0.07 Q3-Q4 2N3906 or 2N4126 Q5 2N3904 or 2N4124 U3 Pin Running Off R1 1k pot (102) 2 0(momentary) 13.0 R2 10k 3 13.0 0 R3-R4 15k 4 13.6 13.6 R5 180 ohms 5 9.0 9.0 R6-R7 470 ohms 6 0 to 9 0 R8 1k pot (102) 7 0 to 9 0 8 13.6 13.6 R9 330k R10 2 meg TYPICAL AUDIO LEVELS WITH STANDARD R11 150k SETUP & FULL DEVIATION INPUT ON R12 100K RECEIVER (SQUELCH OPEN, AUTOPATCH R13 1 meg ON. R14 47k Test Point Typical R15 150k Signal Level R16-R17 1 meg E7 (Audio in from Rcvr) 1.5 V p-p R18 100k E8 (Tones to DTMF Board) 2.2 V p-p E9/U1-9 (Xmit AF to COR Board) 1.5 V p-p R19 150k Q4 Base 50 mV p-p R20 47k Across Phone Line Terminals R21 150k (Phone Line Disconnected) 2 V p-p R22 100k R23 27k TYPICAL AUDIO LEVELS WITH LOUD 1 KHZ R24 10k TEST TONE COMING IN ON PHONE LINE R25 1 meg (SQUELCH CLOSED, AUTOPATCH ON). R26 270 ohms Test Point Typical R27 1 meg Signal Level R28 47k E8 (Across T1 Secondary) 1 V p-p U1-11 50 mV p-p R29 510k U1-10 2 V p-p* R30 150k U1-9/E9 6 V p-p* R31 180 ohms * Varies with setting of Phone Repeat Level R32 1 meg Control R8 R33 3.3k T1 600 ohm transformer PARTS LIST. #56118-005 Ref # Value (marking) U1 3301 quad norton op-amp C1 .001 uf (102, 1nM, or 1nK) (can substitute 3401) C2 1 uf electrolytic U2 4N33 optocoupler C3 47 uF electrolytic U3 555 timer C4 Not used VR1-VR2 1N5239B zener diode, C5 1 uF, 250V metalized 9.1V polyester capacitor C6-C7 .001 uf (102, 1nM, or 1nK) C8-C9 .01 uf disc (103) C10 0.15 uf mylar (red) C11 .01 uf disc (103) C12 33 pf C13 47 uF electrolytic C14 .001 uf (102, 1nM, or 1nK)

©1998 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Revised: 11/27/01 - Page 7 - ©1998 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Revised: 11/27/01 - Page 8 - ©1998 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Revised: 11/27/01 - Page 9 -

©1998 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Revised: 11/27/01 - Page 10 -