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The 1RU BST-25/216 Synthesized Base Station Transmitter from Comtek is an auxiliary base station transmitter which comes with a 1RU rack-mounting faceplate. The base station transmitter is designed to operate in the 216-217 MHz band under parts 22, 74 and 90 of the FCC regulations making it compatible with other manufacturers' all-in-ear type receivers operating in this band. For highest fidelity operation, the PR-216 receiver must be used with the wide-band companded channels. An external antenna (not included) can be attached through a BNC RF connector.
This transmitter may be used for personal cueing, tour guide applications, language interpretation, and 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 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.
60 user-selectable channels in the 216 to 217MHz range: 40 standard narrow-band, non-companded channels; 20 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, and can accommodate a variety of remote antennas
In the Box
Comtek BST-25/216 Synthesized Base Station Transmitter with Rackmount (1 RU)
RMK-25-216 Rack-Mounting Faceplate (1RU)
Limited 2-Year Warranty
Table of Contents
Mic XLR, 600 Ohms balanced -40 dBV (nominal)
Line XLR, 10 Ohms balanced 0 dBV (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
BNC RF output connector for optional external antenna
Type accepted under Parts 22, 74, and 90
12 VDC, 300 mA max
Freq. Response (Rec/Repro)
80 Hz - 10 kHz
Less than 1% at 80% modulation
Soft compressor type with high (25 dB) linear overload protection, attack time less than 1 ms, recovery time 10 ms
Greater than 40 dB
Test Tone: 400 Hz 0.05% distortion
Frequency: 5 and 10 kHz deviation
RF Output Power
Set for 100 mW
Better than 20 ppm, digitally synthesized, crystal controlled