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The BST-25/216 Synthesized Base Station Transmitter from Comtek is an auxiliary base station transmitter designed to operate in the newly assigned 216-217MHz band under part 95 of the FCC regulations. For highest fidelity operation, the PR-216 receiver must be used with the wide-band companded channels.
This transmitter may be used for personal cueing, for tour guide applications, language interpretation and for assistive listening. The BST-25/216 also operates with the Phonak microEar VHF in-ear receiver in the narrow-band non-companded channels.
The BST-25/216 transmitter incorporates the latest digital and analog technologies to produce low residual noise, wide dynamic range, and extended frequency response rendering the most natural sound possible from a wireless system.
57 user-selectable channels in the 216 to 217MHz range: 38 standard narrow-band, non-companded channels; 19 high-fidelity narrow-band channels with companded audio processing
Single window, bright LED display for exact frequency and channel, VU bar graph meter, antenna condition and lock-out indicator
Test tone generator for receiver testing and audio level referencing
Balanced mic or line level with 60 dB of control range to accommodate any audio level
Micro controller automatically sets the modulation deviation, audio mode for processing, and the EQ when corresponding channels are selected
It can be rackmounted for AC or 12 V DC power and can accommodate a variety of remote antennas
In the Box
Comtek BST-25/216 Synthesized Base Station Transmitter
C-16 Carrying Case
BST-25 Operator's Manual
TWA-72 Whip Antenna
AP-12V1 Power Adapter
Table of Contents
Mic XLR, 600 ohm balanced -40dBV (nominal)
Line XLR, 10 kohm balanced 0dBV (nominal)
XLR-3 female audio input connector for mic and line input
XLR-4 male power input 12 V
BNC type RF output connector
LED bar graph VU meter displays audio input (modulation)
Two digit alpha numeric display shows operating channel
Five digit numeric display shows operating frequency
Antenna indicator displays deficient antenna condition
Lock out indicator shows tuning has been disabled
Telescopic antenna mounts directly into top of transmitter
BNC RF output connector for optional external antenna
Type accepted under Part 95
12 V DC, 300 mA max
Freq. Response (Rec/Repro)
Less than 1% at 80% modulation
Soft compressor type with high (25 dB) linear overload protection, attack time less than 1ms, recovery time 10ms
Greater than 40 dB
Test tone: 400Hz 0.05% distortion
Frequency: 5 and 10kHz deviation
RF Output Power
Set for 100mW for FCC Part 95
Better than 20 ppm. digitally synthesized, crystal controlled