Description
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 the highest fidelity operation, the PR-216 receiver must be used with the wide-band companded channels.
This transmitter may be used for personal cueing, tour guide applications, language interpretation, and for assistive listening. The BST-25/216 also operates with the Phonak micro ear VHF in-ear receiver in the narrow-band non-compounded 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-compounded 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
- Microcontroller automatically sets the modulation deviation, an 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
**Please Specify Rack Mount or Carrying Case When Ordering**
| Audio Inputs | Mic XLR, 600 ohms balanced -40dBV (nominal) Line XLR, 10 kohm balanced 0dBV (nominal) |
| Connectors | XLR-3 female audio input connector for mic and line input XLR-4 male power input 12 V BNC-type RF output connector |
| Indicators | LED bar graph VU meter displays audio input (modulation) Two digit alpha numeric display shows the operating channel Five digits numeric display shows the operating frequency The antenna indicator displays a deficient antenna condition Lock out indicator shows tuning has been disabled |
| Antenna | Telescopic antenna mounts directly to the top of the transmitter BNC RF output connector for optional external antenna |
| FCC Compliance | Type accepted under Part 95 |
| Power Requirements | 12 V DC, 300 mA max |
| Freq. Response (Rec/Repro) | 80Hz-8kHz |
| Audio Distortion | Less than 1% at 80% modulation |
| Modulation | Soft compressor type with high (25 dB) linear overload protection, attack time less than 1ms, recovery time 10ms |
| Gain Control | Greater than 40 dB |
| Generators | Test tone: 400Hz 0.05% distortion |
| Modulation | Frequency: 5 and 10kHz deviation |
| RF Output Power | Set for 100mW for FCC Part 95 |
| Frequency Stability | Better than 20 ppm. digitally synthesized, crystal controlled |
| Operating Frequency | 216-217MHz |
| Harmonic & Spurious Emissions | Better than 55 dB below carrier |
| Dimensions (W x H x D) | 6.5 x 1.8 x 5.6″ (165.1 x 45.7 x 142.4mm) |
| Weight | 2.8 lb. (1.2kg) |
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