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Comtek BST-25
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| Base Station Transmitter
The BST-25/216 MHz is a professional quality, auxiliary base station transmitter designed to operate with the PR-216 and PR-216 Option 7 synthesized receivers in the newly assigned 216-217 MHz band under Part 95 of the FCC regulations.
The BST-25/216 MHz 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.
This transmitter may be used for personal cueing, for tour guide applications, language interpretation, and for assistive listening applications.
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- 57 user-selectable channels in the 216-217 MHz 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, the audio mode for companding processing, and the EQ when corresponding channels are selected.
- Can be rack mounted for AC or 12 volt DC power and can accommodate a variety of remote antennas.
Item described: BST-25 216. Also available for TV channels 5/6 (BST-25) and 72-76 MHz (letter frequencies, BST-50b)
Mic: XLR, 600 ohm Balanced -40 dBV (nominal)
Line: XLR, 10 k ohm Balanced 0 dBV (nominal)
Connectors: XLR-3 Female audio input connector for mic and line input, XLR-4 Male power input 12 volts, BNC type RF output connector
Operation Indicators: LED Bargraph 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
Antenna: Telescopic antenna mounts directly into top of transmitter, BNC RF output connector for optional external antenna
FCC Compliance: Type Accepted under Part 95
Power Requirements: 12 Volts DC, 300 mA max
Frequency Response: 80 Hz to 8 kHz
Audio Distortion: Less than 1% at 80% modulation
Modulation Limiter: Soft compressor type with high (25 dB) linear overload protection, attack time less than 1 ms, recovery time 10 ms
Audio Gain Control: Greater than 40 dB
Test Tone Generator: 400 Hz 0.05% distortion
Frequency Modulation: 5 and 10 kHz deviation
RF Output Power: Set for 100 mW for FCC Part 95
Frequency Stability: Better than 20 ppm. digitally synthesized, crystal controlled
Operating Frequency: 216 to 217 MHz
Harmonic and Spurious Emissions: Better than 55 dB below carrier
Dimensions: 6 1/2" wide x 1 3/4" high x 5 5/8" deep
Weight: 44 oz.
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