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Clear-Com TW47
2-Way Radio and Walkie-Talkie Interface


The TW-47 is a stand-alone interface designed to connect a 2-way radio or walkie-talkie into a single channel of a standard Clear-Com...
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Clear-Com TW47
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The TW-47 is a stand-alone interface designed to connect a 2-way radio or walkie-talkie into a single channel of a standard Clear-Com, RTS* (*for RTS systems equipped with the Call Light feature), or compatible 2-wire party-line intercom system. It provides both audio connection and "push-to-talk" transmitter keying, using standard Call signals.

The ability of a 1- to 5-watt walkie-talkie to both talk and receive from the wired intercom system can greatly extend an intercom system's capability, especially in very large indoor and outdoor facilities and venues. The TW-47 is powered directly from the intercom line, and connection to the radio is via a single DB-9F 9-pin connector. The interface has extensive RF and EMI isolation to prevent the 2-way radio RF from radiating into the intercom system.

In order to accommodate the widest variety of 2-way radios, the TW-47 is supplied with a 9-pin connector and wiring diagrams for many 2-way radios.

The combination of internal jumpers (switches) and front panel "Transmit" and "Receive" level controls assures correct level matching to virtually any radio. Adjustments from -57dB microphone level to +11dB line level are supported. A bi-color LED provides a visual indication of audio level from the intercom line.

Radio Transmitter 'Keying'
A relay contact provides the required "Push-to-Talk" transmitter "keying" of the radio. This relay is activated by detecting the "Call Signal" on the intercom channel. The relay contacts, in conjunction with the custom-made radio cable, allow correct transmitter keying of virtually any type of radio. A "Transmit Key" LED indicates that the relay is active.

Certain Clear-Com stations can be set up so that the Call signal is activated automatically when the Talk button is pressed (Talk-on-Call). With these stations, the radio transmitter can be keyed by simply pushing the Talk button. The operation of the 2-way radio then becomes seamless and transparent to station users.

Clear-Com TW47 Features:

  • Interfaces any 2-way radio to a Clear-Com, RTS, or compatible system
  • Accepts any walkie-talkie
  • Powered by the intercom line
  • Easy to interconnect
  • Individual transmit and receive level controls
  • Bi-color LED audio level indicator
  • Small footprint - will fit anywhere

Clear-Com TW47 Applications:

  • Special event production and coordination
  • Outdoor events
  • Theatrical rehearsals
  • Touring shows where all usable, licensed radio frequencies are already allocated
  • House manager communications and tech rehearsals
  • Wherever increased mobility and greater reach are required from the intercom system

Clear-Com TW47 Specifications:

Radio to Party Line

  • Frequency Response: 200-20KHz ± 3dB
  • Max Gain: >=-5dBu
  • Distortion: <=0.3%
  • Noise: <=-70dBu
  • Max Level Before Clipping: >=+17dBu
  • Green LED Threshold: -22dBu ± 3dB
  • Red LED Threshold: -16dBu ± 3dB
  • Input Impedance: 400 ohms ± 100 ohms

Party Line to Radio

  • Frequency Response: 200-8KHz ± 3dB
  • Max Gain J7 ON, J8 ON: -12dBu ± 3dB
  • Max Gain J7 OFF, J8 ON: +2dBu ± 3dB
  • Max Gain J7 OFF, J8 OFF: +27dBu ± 3dB
  • Distortion: <=0.3%
  • Noise: <=-50dBu
  • Max Level Before Clipping: >=0dBu

Technical Specifications

  • Power Requirements
    • Input Voltage Range: 20-30VDC
    • Quiescent Current:<=40mA
    • Current with Audio: <=50mA
    • Current with Call: <=60mA
  • Rear Panel Connectors
    • (1) XLR3F
    • (1) DB-9F
  • Front Panel Controls and Indicators
    • Transmit: (1) Red LED
    • AudioLevel Hi: (1) Red LED
    • Audio Level Norm: (1) Green LED
    • Receive LevelAdjust: (1) Control
    • Transmit Level Adjust: (1) Control
  • Dimensions (H x W x D): 1.8" x 3.95" x 6.4"
  • Weight: 1 lb 4 oz
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