2-Way Radio Interface

  • Interfaces any 2-way radio to a single channel of Clear-Com, RTS or compatible system
  • Accepts any walkie-talkie or radio with headset and microphone jacks
  • Individual transmit and receive level controls
  • Bi-color LED audio level indicator
  • Powered by the intercom line


Item Part Number:


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, or compatible 2-wire party-line intercom system. It provides both audio connection and “push-to-talk” transmitter keying, using standard Call signals.

Note: Access the Encore Power Supply Calculator to estimate power requirements for analog partyline systems.

Technical Specifications

Radio to Partyline
Line Characteristics

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: 400Ω ± 100Ω

Partyline to Radio
Line Characteristics

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

Power Requirements

Input Voltage Range: 20-30V DC

Quiescent Current: <=40mA

Current with Audio: <=50mA

Current with Call: <=60mA


1.8 x 3.95 x 6.4in (HxWxD)

(46 mm x 100 mm x 163mm)


1.3lbs (0.6kg)

Associated Products

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