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Summary of Contents for Comtek BST-50b
- Page 1 BST-50b OPERATOR’S MANUAL (72-76 MHz) Synthesized Base Station Transmitter 357 West 2700 South • Salt Lake City, Utah 84115 • Phone: (800) 496-3463 • Fax: (801) 484-6906 • www.comtek.com...
- Page 2 BST-50b Synthesized Base Station Transmitter he BST-50b is a high fidelity, professional quality, base station transmitter designed for assistive listening, language translation, and remote monitoring applications. This transmitter operates under F.C.C. Part 90 in the business band which allows for higher power ideal for large area venues such as stadiums, coliseums, and auditoriums.
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Page 3: Equipment Placement
BST-50b is operating, checking all audio outputs for uncharacteristic noise. If a problem is found, move the BST-50b or the remote antenna as far as possible from the affected equipment. Should you continue to have problems, contact Comtek's application engineering department for assistance. -
Page 4: Power Requirements
Set-up a. Select an appropriate location for the BST-50b, i.e. a sound cabinet or closet, where there is easy access to the audio equipment and where the antenna can be extended to the correct length. - Page 5 Mount the telescoping whip antenna in the hole on top of the BST-50b, rotating it clockwise until it is firmly seated. Extend the antenna completely. During normal operation the antenna indicator should not flash. Turn on the transmitter and verify that the antenna indicator is not flashing.
- Page 6 Only very loud speech or music should deflect the VU meter full scale. Audio Processing and Frequency Selection To accommodate a wide variety of receivers, the BST-50b base station transmitter has the ability to operate both companded and non-companded. (Refer to page 11 for listing of receivers to determine whether you need to operate companded or non-companded.) The display on the front panel will indicate...
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Page 7: Multiple Channel Operation
Test Tone The BST-50b 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 for verification of the system. -
Page 8: Display On/Off
Speech EQ On the back of the transmitter there is a switch labeled “EQ”. With this function enabled (switch up), the audio dynamics and frequency response are processed to improve intelligibility of speech. If the primary audio source is going to be speech, you should enable this processing. - Page 9 BST-50b FRONT PANEL 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. LOCK OUT INDICATOR: Illuminates when the “TUNING” switch is disabled by setting the “LOCK OUT”...
- Page 10 BST-50b REAR PANEL LOCK OUT SWITCH: Disables the front panel “TUNING” switch, locking the transmitter on one frequency. DC INPUT JACK: Requires 12 VDC at 500 mA source (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-50b FREQUENCY CHART CHAN CHAN FREQ CHAN FREQ FREQ 72.020 MHz 72.720 MHz 75.330 MHz 72.740 MHz 72.040 MHz 75.350 MHz 72.760 MHz 72.060 MHz 75.370 MHz 72.780 MHz 72.080 MHz 75.390 MHz 72.800 MHz 72.100 MHz 75.420 MHz 72.120 MHz 72.820 MHz... - Page 12 BST-50b FREQUENCY GROUPS For Non-Companded Operation Companded Operation Only With PR-72b and PR-75 With PR-25 and PR-216 CHANNEL FREQUENCY GROUP ONE 72.100 MHz CHANNEL FREQUENCY 72.300 MHz 72.500 MHz 72.020 MHz 72.700 MHz 72.220 MHz 72.900 MHz 72.720 MHz 75.500 MHz 74.610 MHz...
- Page 13 BST-50b SPECIFICATIONS Audio Distortion: Audio Inputs: • Mic XLR, 600 ohm Balanced -40 Less than 0.5% at 80% modulation dBV (nominal) • Line XLR, >10 k ohm Balanced 0 Modulation Limiter: dBV (nominal) Soft compressor type with high (25 dB) linear overload protection,...
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Page 14: 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 15 357 West 2700 South • Salt Lake City, Utah 84115 • Phone: (800) 496-3463 • Fax: (801) 484-6906 • www.comtek.com...
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