Radio Systems

VRX-SL Single Channel VHF Receiver

Specifications

Frequency To be specified within 136-174MHz Modulation Narrowband FM 12.5kHz or 25kHz channel spacing to be specified at time of order Sensitivity 107dBm (luV) signal modulated by 1kHz tone with a peak deviation of 2.5kHz produces an output s+n/n ratio greater than 26dB Squelch Threshold 120dB (0,2uV) nominal. Adjustable through control under battery cover Adjacent Channel Rejection Ratio Better than 75dB Spurious Response Better than 60dB Intermodulation Rejection Ratio Better than 60dB, measured as per MPT 1301 Desensitisation (Blocking) Level Better than -23dBm Spurious Outputs Excellent RF performance Less than -47dBm (20nW) Outputs Recorder-50mV rms (typical) into 20KO, Small size suitable both for discreet body-worn independent of volume setting communication and general portable applications Headphones-60mW typical into 8Q. Squelch-open collector/-ve ground. 'On' when receiver is muted Supply Voltage Outputs for headphones, recorder and squelch state 6-10VDC. Power Source Internal PP3 Alkaline battery. Simple interfacing for control of other equipment Rear panels with power input socket available. Battery Life Available with factory fitted scrambler With squelch lifted and standard headphones connected approximately 12 hours Supply Current The VRX-SL receiver, due to its small size, is generally intended for body- Less than 25mA with squelch lifted and no worn use. However, the receiver's excellent performance and facilities headphones. make it suitable for other portable applications. Temperature Range Above specifications measured between + 10°C to +35°C. Permissible operating Outputs temperature range-10°C to +60°C A single socket provides outputs for ear/headphones (including Front Panel Control inductive earpieces), tape recorder and squelch state. The squelch Single 6-position switch for off, output allows control of other equipment. A VTX transmitter and VRX-SL battery test, and 4 volume settings receiver can be connected together to form an automatic repeater or Front Panel Indicator remotely controlled transmitter. Directly compatible with TTL level Single LED for battery test inputs the addition of the Audiotel Receiver Interface Unit, which uses Rear Control the receiver's squelch output to drive a relay, enables a standard tape (Under battery cover). Squelch threshold recorder, for example, to be activated whenever the receiver detects Finish Black. Other colours to special order

Tel: 0536 66677 Fax: 0536 66711 ^w#a#i#tLi Telex: 341775 AudintG Audiotel International Limited, Cavendish Courtyard, Sallow Road, Corby, England NN17 1DZ § Copyright 1989 Audiotel International. All rights reserved. All specifications, through product improvement, may be changed without notice. an on-channel transmission. Combined with a VTX transmitter Size & Weight operating in the voice activated (VOX) mode this gives great flexibility Width 64mm for unattended operation. Depth 23mm Height 113mm (inc connectors) Weight including battery 245g The audio output, adjustable to 4 volume settings, allows a wide range Accessories of earpieces and headphones together with small loudspeakers to be Included with every unit is a pair of driven, The tape recorder output level is independent of this setting, walkman style earphones and a soft wire an tenna. Other options include: RF Performance Headphones, earphones, and inductive Sensitivity, unwanted signal rejection and desensitisation performance earpieces Multi-output lead assemblies are excellent for such a compact and low power receiver. Using noise Interface for switching of tape recorders and detection as opposed to carrier detection ensures that the squelch is other equipment reliable, repeatable and immune to false operation. Vehicle antennas and adaptors Vehicle power supply A control beneath the battery cover enables the squelch level to be Mains power supply Body harness adjusted. Internal power regulation gives constant performance as the Related Equipment battery discharges. Power consumption is low and continuous VTX transmitters operation for over 24 hours is possible with a fresh Alkaline battery. VRX multichannel receiver Slow speed cascadable cassette recording Construction systems An extruded aluminium sleeve forms the main chassis and gives good VRXS scrambled receiver mechanical strength. All circuitry is contained on a single board VTX/VRX AC PSU VTX/VRX Vehicle PSU allowing access to all components. Self-latching connectors and 4 digit DTMF Switch for remote control switched rotary control help eliminate accidental operation and disabling. Order Numbers 601-200 VRX-SL 12.5kHz single channel receiver 601-201 VRX-SL 25.0kHz single channel receiver 601 -300 VRXS-SL 12.5kHz receiver with fitted scrambler 601-301 VRXS-SL 25.0kHz receiver with fitted scrambler

VRXS-SL Dimensions 5jl (showing scrambler fitted)

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Output Socket I [LED I \Antenna socket |

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99mm Headphones Ae/-ve Squelch/Remote Recorder "1 ' lopnm ® ® 7

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23mm .® o ps ® 7 Sauelch --TV+ Battetv 23mm ■ 64mm ■

Poortweg 6,2612 PA Delft, Tel: 015-614041. Fax: 015-623577 Audiotel International Limited, Cavendish Courtyard, Sallow Road, Corby, England NN17 1DZ _> Copyright 1989 Audiotel International. All rights reserved. All specifications, through product improvement, may be changed without notice.