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Summary of Contents for Comtek BST-25
- Page 1 BST-25 OPERATOR’S MANUAL (216 MHz) Synthesized Base Station Transmitter 357 West 2700 South • Salt Lake City, Utah 84115 • Phone: (800) 496-3463 • Fax: (801) 484-6906 • http://www.comtek.com...
- Page 2 Synthesized Base Station Transmitter he BST-25 / 216 MHz is a professional quality, low power, auxiliary base station transmitter designed to operate in the newly assigned 216-217 MHz band under part 95 of the FCC regulations. This transmitter may be used for personal cueing, for tour guide applications, language interpretation, and for assistive listening.
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Page 3: Equipment Placement
OPERATING INSTRUCTIONS Equipment Placement If the BST-25 base station is to be rack-mounted, a remote antenna must be used. The base station should be mounted away from equipment that uses large power transformers to reduce 60 Hz hum possibilities. If the base station is to be used outside of a traditional rack-... -
Page 4: Power Requirements
Power Requirements The BST-25 base station is designed to be powered by 12 volts DC. A power adaptor is furnished for use with standard 110V AC. The on/off switch on the front panel of the base station turns on the transmitter. -
Page 5: Audio Adjustments
OPERATING INSTRUCTIONS (continued) d. Plug the adaptor into a standard AC outlet and plug the power connector into the DC input jack of the transmitter. Turn the display switch on the front of the transmitter "ON" to allow monitoring of the transmitter frequency. -
Page 6: Frequency Selection
VU meter full-scale. Frequency Selection The BST-25 216 MHz base station transmitter can operate on 60 channels between 216 MHz and 217 MHz. Channels 1-40 are narrow-band channels for use with the Phonak microEar receiver with 5 KHz deviation. - Page 7 (Contact COMTEK to obtain a free copy of the frequency selection software.) Test Tone The BST-25 base station transmitter has an internal 400 Hz source which is transmitted when the “TONE” switch is enabled. This source is intended to be used to make technical adjustments and to verify the operation of the system.
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Page 8: Display On And Off
Display On and Off The digital display can be turned on or off using the “DISPLAY” switch. Disabling the display reduces the current consumption of the transmitter for battery operation. In environments where the display could be distracting, disabling the display may also be appropriate. When the display is disabled, the tuning controls are also disabled, ensuring the transmitter frequency is not changed inadvertently. - Page 9 BST-25 FRONT PANEL (216 MHz) DISPLAY SWITCH: This switch disables the digital display to conserve current when used with a battery. TONE SWITCH: Enables/disables the internal 400 Hz test tone. TUNING SWITCH: Selects the frequency on which the transmitter will operate.
- Page 10 BST-25 REAR PANEL (216 MHz) LOCK OUT SWITCH: Disables the (front panel) “TUNING” switch, locking the transmitter on one frequency. DC INPUT JACK: Requires 12 VDC at 500 mA (Pin-1 ground, pin-4 +12 volts). EXTERNAL ANTENNA JACK: BNC connector provides a standard 50 ohm RF output for use with an external antenna.
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Page 11: Frequency Chart
BST-25 216 MHz FREQUENCY CHART CHANNEL FREQUENCY CHANNEL FREQUENCY NARROW-BAND CHANNELS 216.7875 MHz For use with COMTEK and other manufacturers 216.0125 MHz 216.8125 MHz 216.0375 MHz 216.8375 MHz 216.0625 MHz 216.8625 MHz 216.0875 MHz 216.8875 MHz 216.1125 MHz 216.9125 MHz 216.1375 MHz... - Page 12 BST-25 BST-25 216 MHz 216 MHz NARROW-BAND WIDE-BAND FREQUENCY GROUPS FREQUENCY GROUPS For COMTEK Compatible with COMTEK and other manufacturers equipment only (5 kHz deviation) (10 kHz deviation) GROUP 1 GROUP A CHANNEL FREQUENCY CHANNEL FREQUENCY 216.0250 MHz 216.0125 MHz 216.1750 MHz...
- Page 13 BST-25 INTERNAL ADJUSTMENTS (216 MHz) NOTE: The Compand Switch must be set to the “ON” position for automatic companded and non-companded operation with channel selection. The “OFF” position is only used for testing. Page 12...
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Page 14: Included Accessories
BST-25 ACCESSORIES (216 MHz) Included Accessories 1. C-16 Carrying case 2. BST-25 Operator’s manual 3. TWA-72 Whip antenna 4. BST-25 Base station transmitter 5. AP-12V1 Power adaptor (115 VAC Input) Page 13... -
Page 15: Optional Accessories
BST-25 ACCESSORIES (216 MHz) Optional Accessories 1. RDA-2 Remote dipole antenna 2. PRA Phase-Right coaxial antenna 3. MO-1/4 wave vehicle installation antenna or MO-1/4 wave magnetic mount antenna 4. PRA Phase-Right antenna mount 5. RMK 25 Single rack-mount face plate 6. - Page 16 BST-25 SPECIFICATIONS (216 MHz) Audio Inputs: Audio Distortion: • Mic XLR, 600 ohm Balanced -40 Less than 1% at 80% modula- tion dBV (nominal) • Line XLR, 10 k ohm Balanced 0 dBV (nominal) Modulation Limiter: Soft compressor type with high...
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Page 17: Warranty
WARRANTY COMTEK warrants this product to be free from defects in workmanship and material under normal use and conditions for a period of one year from date of original purchase. Items such as batteries, neckloops, and cords are not covered by the warranty. Damage due to misuse, ill treatment and unauthorized modification and repairs are not covered by this warranty. - Page 18 357 West 2700 South • Salt Lake City, Utah 84115 • Phone: (800) 496-3463 • Fax: (801) 484-6906 • http://www.comtek.com...
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