Comtek BST-50b Base Station Transmitter


  • 50 User-Select Non-Companded Channels
  • 88 Narrow-Band Companded Channels
  • Bright, Single Window LED Display
  • Audio Processing System
  • Switchable EQ Circuit
  • Balanced Mic or Line Level Input
  • Test Tone Generator
  • Rackmountable
  • Compatible w/ PR-75/PR-216B/PR-72b
  • AC or 12 V DC Power


The BST-50b Base Station Transmitter from Comtek is a high fidelity, professional quality, base station transmitter designed for assistive listening, language translation, and remote monitoring applications. A wide variety of special features enable this transmitter to work with any existing sound installation.

The BST-50b Base Station Transmitter operates under F.C.C. Part 90 in the business band, which allows for higher power ideal for large area venues such as stadiums, coliseums, and auditoriums. The switchable EQ circuit is perfect for superb speech intelligibility, or full-range high fidelity for remote monitoring of mixer output. The BST-50b transmits on a user-selectable channel in the 72 to 76MHz band to a variety of Comtek personal receivers.

Lastly, the device can be rack-mounted for AC or 12-volt DC power. The BST-50b can accommodate a wide variety of remote antennas as well.

  • 50 user-selectable non-compounded channels in the 72 to 76MHz frequency range: channels 1 to 40 for narrow-band operation; channels A to J for wide-band operation; and 88 narrow-band compounded channels for higher power operation
  • Bright, single window LED display for exact frequency and channel, VU meter, and special function indicators. The display can be turned off to conserve power when battery operated
  • Audio processing systems can operate compounded (2:1 compression) or non-compounded to accommodate a greater variety of receivers
  • Microprocessor automatically adjusts for wide-band channels A to J, and narrow-band channels 1 to 40
  • Switchable EQ circuit for superb speech intelligibility, or full range high fidelity for remote monitoring of mixer output
  • Balanced mic or line level input with 60 dB of control range to accommodate any audio level or can also operate from intercom feed line
  • Test tone generator for receiver testing and audio level referencing
  • The device can be rack-mounted for AC or 12 V DC power
  • The BST-50b can accommodate a variety of remote antennas
  • The BST-50b is compatible with the PR-75, PR-216B 72 to 76MHz, and the PR-72b receivers
Audio Inputs Mic XLR, 600 ohm balanced -40 dBV (nominal)
Line XLR, >10 kohm balanced 0 dBV (nominal)
Connectors XLR-3 female audio input connector for mic and line input
XLR-2 male power input 12 volts
BNC-type RF output connector
Indicators LED bar graph VU meter displays audio input (modulation)
Two digit alpha numeric display shows the operating channel
Five digits numeric display shows the operating frequency
The antenna indicator displays a deficient antenna condition
Lock out indicator shows tuning has been disabled
Antenna Telescopic antenna mounts directly to the top of the transmitter
BNC RF output connector for optional external antenna
FCC Compliance Type accepted under Part 90
Power Requirements 12 V DC, 300 mA max
Freq. Response (Rec/Repro) 80Hz-10kHz
Audio Distortion Less than 0.5% at 80% modulation
Modulation Soft compressor type with high (25 dB) linear overload protection, attack time less than 1ms, recovery time 10ms
Gain Control Greater than 40 dB
RF Output Power Set for 120 mW for FCC Part 90
Frequency Stability Better than 0.002%. digitally synthesized, crystal controlled
Modulation Frequency: 10kHz deviation
Generators Test tone: 400Hz .5% distortion
Operating Frequency 72.020-75.980MHz
Harmonic & Spurious Emissions Better than 55 dB below carrier
Dimensions (W x H x D) 6.5 x 1.8 x 5.6″ (165.1 x 45.7 x 142.4mm)
Weight 2.8 lb. (1.3kg)


Additional information

Weight 8.50 lbs
Rack Mounted

Yes, No


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