Comtek BST-50b Remote Program Monitoring Transmitter

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The BST-50b base station transmitter is designed to meet the high demands of assistive listening, language interpretation, and other high fidelity one-way radio link applications. A wide variety of special features enables this transmitter to work with any existing sound installation. Plus, the BST-50b maintains complete compatibility with existing wide-band or narrow- band assistive listening receivers of any make, including companded and non-companded receivers, for high fidelity sound reproduction. What’s more, the BST-50b offers the added versatility of 120 mW of power for large arenas and stadiums.


  • Assistive Listening 
  • Language Interpretation
  • Remote Program Monitoring




Audio Inputs:
• Mic: XLR 600 ohm Balanced -40 dBV (nominal)
• Line: XLR >10 k ohm Balanced 0 dBV (nominal)
  • Telescopic antenna mounts directly into top of transmitter
  • BNC RF output connector for optional external antenna
RF Output Power: 120 mW for F.C.C. Part 90
Operation Indicators:
  • LED Bargraph VU Meter displays audio input (modulation)
  • Two-Digit Alpha Numeric Display shows operating channel
  • Five-Digit Numeric Display shows operation frequency
  • Antenna Indicator displays deficient antenna condition
  • Lock-out Indicator shows tuning has been disabled
Power Requirements: 12 Volts DC, 300 mA max
Frequency Response: 80 Hz to 10 kHz
Modulation Limiter: Soft compressor type with high (25 dB) linear
overload protection, attack time less than
1 ms, recover time 10 ms
Audio Gain Control: Greater than 40 dB
Frequency Modulation:
  • Up to 50 kHz deviation for wide-band channels
  • 10 kHz deviation for narrow-band channels
Frequency Stability: Better than 0.002%
digitally synthesized, crystal controlled
Dimensions: 6 1/2” W x 1 3/4” H x 5 5/8” D
Weight: 44 oz.