BST-50b Base Station Transmitter

Assistive Listening • Language Interpretation • Remote Program Monitoring

• 50 User-Selectable Channels
• Balanced Mic or Line Level Input
• Switchable EQ Circuit for Speech Intelligibility or Full Range High Fidelity

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.

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 FCC 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.


All documents are in PDF format.

>> BST-50b Tech Sheet
>> BST-50b User Manual


The BST-50b transmitter is compatible with the following receiver:

>> PR-75a