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Comtek BST 25 Base Station Transmitter with Rackmount, Frequency 216Mhz
MPN: BST25-216 RMK

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Product Details

Includes a 12-volt DC power supply and RMK-25-216 rack mount.


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 for a wireless system. For highest fidelity operation, the PR-216 receiver can be used on the wide-band companded channels. The BST 25-216 is also compatible with other manufacturer’s all-in-ear type receivers operating in the 216-217 MHz band on the narrow band non-coompanded channels with a special EQ setting. The transmitter’s microcontroller automatically sets the modulation deviation and the audio mode for companding processing when corresponding channels are selected. 

  • 57 User-Selectable Channels
  • Balanced Mic or Line Level Input
  • Companded and non-Companded Audio Processing
Product Specification

Audio Inputs:
• Mic: XLR 600 ohm Balanced -40 dBV (nominal)
• Line: XLR > 10 k ohm Balanced 0 dBV (nominal)

• Telescopic antenna mounts directly into top of transmitter
• BNC RF output connector for optional external antenna

RF Output Power: 50 mW for FCC Part 74

Operation Indicators:
• LED Bargraph VU Meter displays audio input (modulation)
• Two-Digit Alpha Numeric Display shows operating channel
• Five-Digit Numeric Display shows operation frequency
• Antenna indicator displays deficient antenna condition
• Lock-out Indicator shows tuning has been disabled

Power Requirements: 12 Volts DC, 300 mA max

Frequency Response:  80 Hz to 10 kHz

Modulation Limiter:  Soft compressor type with high (25 dB) linear overload protection; attack time less than 1 ms; recover time 10 ms

Audio Gain Control: Greater than 40 dB

Test Tone Generator: 400 Hz 0.05% distortion

Frequency Modulation:
• 10 kHz deviation for narrow band channels
• 75 kHz deviation for wide band channels

Frequency Stability: Better than 0.002% digitally synthesized, crystal controlled

Operating Frequency: 76.2 MHz to 87.8 MHz

Harmonic and Spurious Emissions: Better than 55 dB below carrier

Dimensions: 6 1/2″ W x 1 3/4″ H x 5 5/8″ D

Weight: 44 oz.

Comtek BST 25 Base Station Transmitter with Rackmount Datasheet


Comtek BST 25 Base Station Transmitter with Rackmount Datasheet