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Comtek BST-75
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| Minature Base Station Transmitter
The BST-75 mini base station transmitter meets the highest professional standards while offering outstanding value and the most advanced technology available. This versatile and innovative transmitter is simple to use, yet it has sophisticated features such as "Flash Memory" 98-channel programmability with synthesized manual 10-channel selectable user-switch. Plus a unique multifunction RF indicator detects bad antenna load, RF presence, coaxial cable short or open condition for quick and easy troubleshooting.
The compact design of this transmitter is ideal for multiple transmitter installations. Up to four transmitters can be installed in one rack space. Also, it operates in the 72-76 MHz band under FCC Regulation Part 90. This allows a greater RF power capability (120 mW) for greater range and reliability than customary FCC Part 15 systems.
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The audio processing circuit produces full fidelity frequency response from 80 Hz to 10 kHz with very low residual FM noise and distortion. To accommodate a greater variety of receivers, the BST-75 can operate with non-companded receivers or with companded receivers for higher fidelity sound reproduction with a signal-to-noise ratio of up to 100 dB.
All this is designed into a stylish, compact, all-metal enclosure suitable for permanent rack-mount installations or for stand-alone portable applications.
Audio Inputs: Line level - balanced input 0 dBm for 80% modulation (+20 dBm max), Electret mic - unbalanced input -25 dBV at 5 k for 80% modulation
Connectors: XLR-3F Combo with 1/4" phone jack, Barrel type 5.5mm X 2.1mm power jack AC or DC, BNC type RF output
Operation Indicators: LED bargraph VU meter, LED antenna load and coaxial cable condition indicator, LED DC power indicator
Antenna: 19" Telescopic antenna mounts directly into top of transmitter, BNC RF output connector for optional external antenna
FCC Compliance: Type Accepted under FCC Part 90
Power Requirements: 12 Volts AC or DC, 200 mA max
Frequency Response: 80 Hz to 10 kHz
Audio Distortion: Less than 0.5% at 80% modulation
Modulation Limiter: Peak compressor type with high linear overload protection (25 dB). Attack time less than 1 ms, recovery time 10 ms
Audio Processing: Companded and non-companded to accommodate a variety of receivers
Audio Gain Control: Limited to 20 dB
Frequency Modulation: 10 kHz deviation for narrow band companded
RF Output Power: Maximum power output for FCC Part 90 (120mW)
Frequency Stability: Better than 0.002% digitally synthesized, crystal controlled
Operating Frequency: 72.020 to 75.980 MHz, 88 "Flash Memory" programmable channels
Harmonic and Spurious Emissions: Better than 50 dB below carrier
Dimensions: 3 3/4" X 1 5/8" X 5 1/4" deep
Weight: 15 1/4 oz.
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