BST-25 / 216 MHz
Contents
1. 216 2375 MHz WIDE BAND CHANNELS For use with COMTEK equipment 216 9875 MHz 216 0250 MHz 216 2625 MHz 216 2875 MHz 216 0750 MHz 216 3125 MHz 216 1250 MHz 216 3375 MHz 216 1750 MHz Nn 216 3625 MHz 216 2250 MHz gt 216 3875 MHz 216 2750 MHz 216 4125 MHz 216 3250 MHz oo 216 4375 MHz 216 3750 MHz 216 5125 MHz 216 4250 MHz N N 216 5375 MHz 216 5250 MHz 216 5625 MHz 216 5750 MHz 216 5875 MHz 216 6250 MHz N Nn 216 6125 MHz 216 6750 MHz gt 216 6375 MHz 216 7250 MHz 216 6625 MHz 216 7750 MHz N oo 216 6875 MHz 216 8250 MHz No 216 7125 MHz 216 8750 MHz o 216 7375 MHz 216 9250 MHz W 216 7625 MHz Page 10 216 9750 MHz BST 25 216 MHz NARROW BAND FREQUENCY GROUPS Compatible with COMTEK and other manufacturers 5 KHz deviation GROUP A CHANNEL FREQUENCY 216 0125 MHz 216 2125 MBz 216 3625 MHz 216 5875 MHz 216 7625 MHz 216 8875 MHz GROUP B CHANNEL FREQUENCY 216 0875 MHz 216 2375 MHz 216 3375 MHz 216 7875 MHz 216 8625 MHz 216 9875 MHz GROUPC CHANNEL FREQUENCY 2162. EB em COMPAND Lo Lo o 63 569 WB DEVIATION RO swn SENSITIVITY eee le 2 A o NB DEVIATION Eu Q position is only used for testing NOTE The Compand Switch must be set to the ON position for automatic companded and non companded operation with channel selection The OFF Page 12 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 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 9i MO 1 4 wave magnetic mount antenna 4 PRA Phase Right antenna mount B 5 RMK 25 Single rack mount face plate 8 OEE 6 RMK 25 2 Double rack mount face plate Page 14 BST 25 SPECIFICATIONS 216 MHz Audio Inputs Mic XLR 600 ohm Balanced 40 dBV nominal Line XLR 10 k ohm Balanced 0 dBV nominal Connectors XLR 3 Female audio input connector for mic and line input XLR 4 Male power input 12 volts BNC type RF output connector Operation Indicators LED Barg
3. base station to the ON position The front display should now be illuminated e Mount the telescoping whip antenna in the hole on top of the base station rotating it clockwise until it is firmly seated Extend the antenna completely 12 1 2 inches During normal operation the antenna indicator should not flash Turn on the transmitter and verify that the antenna indicator is not flashing If the antenna indicator is flashing it is an indication that the antenna is not fully efficient The antenna should be checked for appropriate length antenna elements in too close proximity to metallic objects or for a damaged coaxial cable to remote antenna Also DO NOT install screw in whip antenna if remote antenna is used Audio Adjustments In order to ensure the highest possible transmission fidelity the transmitter must be modulating at least 50 with normal speech 3 dB on the VU meter This adjustment is made in the following manner Page4 a Ensure that the audio source has been optimized for best signal to noise ratio b The MIC LINE switch located at the back of the transmitter should be switched to the appropriate setting MIC for mic level or weak line level input LINE level for line level input c The LEVEL control on the back of the base station should be set fully counterclockwise and then while normal program information is present slowly rotate the LEVEL control clockwise until the VU meter on the
4. the first numeric digit on the display will illuminate indicating that the tuning has been disabled When rack mounting the transmitter this switch must be accessed from behind the rack This provides added protection from tampering Page7 BST 25 FRONT PANEL 216 MHz CONM TEK BST 25 SYNTHESIZED TRANSMITTER TUNING Lock OUT ANTENNA T 8 E i d 1 E Y 9 216 MHz FREQUENCY CHANNEL 9 ES DISPLAY SWITCH This switch disables the digital display to conserve current when used with a battery 8 TONE SWITCH Enables disables the internal 400 Hz test tone 9 TUNING SWITCH Selects the frequency on which the transmitter will operate 0 LOCK OUT INDICATOR Illuminates when the TUNING switch is disabled by setting the LOCK OUT switch rear panel to ON 6 DIGITAL FREQUENCY DISPLAY Displays the frequency on which the transmitter is operating Q ANTENNA INDICATOR Flashes when the transmitter senses a deficient antenna condition 0 VU METER Displays the level of audio being transmitted Used to adjust the LEVEL rear panel control O DIGITAL CHANNEL DISPLAY Displays the channel on which the transmitter is operating POWER SWITCH Turns the transmitter on or off Page 8 BST 25 REAR PANEL 216 MHz S N F C C ID C6ZBST25 216 C J ANTENNA DC INPUT LEVEL 5 ON O PIN1 G
5. 0625MHz 216 1125 MHz 216 2875 MHz 216 5375 MHz 216 9375 MHz GROUPD CHANNEL FREQUENCY 216 4125 MHz 216 5625 MHz 216 7375 MHz 216 8375 MHz 216 9625 MHz Page 11 BST 25 216 MHz WIDE BAND FREQUENCY GROUPS For COMTEK equipment only 10 KHz deviation GROUP 1 CHANNEL FREQUENCY 216 0250 MHz 216 1750 MHz 216 5250 MHz 216 7250 MHz 216 9750 MHz GROUP 2 CHANNEL FREQUENCY 216 0750 MHz 216 4250 MHz 216 6250 MHz 216 8750 MHz GROUP 3 CHANNEL FREQUENCY 216 1250 MHz 216 2750 MHz 216 5250 MHz 216 8250 MHz GROUP 4 CHANNEL FREQUENCY 216 1750 MHz 216 3250 MHz 216 6750 MHz 216 9250 MHz BST 25 INTERNAL ADJUSTMENTS 216 MHz 6 ry L SWR BALANCE HB COMPANDOR SYMMETRY RF POWER LEVEL p df NOT ADJUST 2 69 5 s 2 u o 5 8 2 j S n 6 O OJ al 2 9
6. 496 3463 e Fax 801 484 6906 http www comtek com
7. BST 25 OPERATOR S MANUAL 216 MHz Synthesized Base Station Transmitter BST 25 SYNTHESIZED TRANSMITTER COMTEK TUNING v 4 3 E AY TONE 216 MHz FREQUENCY w CHANNEL POWER COM u lt 357 West 2700 South e Salt Lake City Utah 84115 e Phone 800 496 3463 e Fax 801 484 6906 http www comtek com INTRODUCTION BST 25 216 MHz Synthesized Base Station Transmitter 6 p x 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 For highest fidelity operation the PR 216 receiver must be used with the wide band companded channels The BST 25 216 MHz also operates with the Phonak microEar VHF in ear receiver in the narrow band non companded channels The BST 25 216 MHz 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 Page 1 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 powe
8. ND us 9 00 PIN 4 12V Q 8 LOCK OUT T CON TEK BST 25 waoe IN U S Be UT o ili 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 D EXTERNAL ANTENNA JACK BNC connector provides a standard 50 ohm RF output for use with an external antenna e SPEECH ENHANCEMENT SWITCH Enables and disables speech enhance feature Enable this function switch up for speech and disable it switch down for music For use with Phonak s or COMTEK IR 230 the EQ switch should be in the up position IMPORTANT D LEVEL CONTROL This control should be adjusted so that normal audio deflects the VU meter to midscale BALANCED AUDIO INPUT Accepts audio from a line level or dynamic 6 p y microphone Pin 1 ground MIC LINE SWITCH Selects the desired audio input sensitivity Page 9 51 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 0375 MHz 216 8125 MHz 216 0625 MHz 216 8375 MHz 216 0875 MHz 216 8625 MHz 216 1125 MHz 216 8875 MHz 216 1375 MHz 216 9125 MHz 216 1625 MHz 216 9375 MHz 216 1875 MHz 216 9625 MHz MN bd 216 2125 MHz
9. atteries 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 COMTEK is not liable for consequential damages arising out of any failure of the equipment to perform as intended COMTEK shall bear no responsibility or obligation with respect to the manner of use of any equipment sold by it COMTEK SPECIFICALLY DISCLAIMS AND NEGATES ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF SUCH EQUIPMENT INCLUDING WITHOUT LIMITATION ANY WARRANTY THAT THE USE OF SUCH EQUIPMENT FOR ANY PURPOSE WILL COMPLY WITH APPLICABLE LAWS AND REGULATIONS Service Policies Warranty repairs must be done by COMTEK Only factory technicians are authorized to perform warranty service on the BST 25 transmitter Before returning the BST 25 for service a Return Authorization Number should be obtained from the service department by calling 1 800 496 3463 or 1 801 466 3463 Return the unit to the factory with the original or comparable packing COMTEK will pay for insurance and ground return shipping costs in the United States for all warranty service COMTEK 357 West 2700 South Salt Lake City Utah 84115 Phone 800 496 3463 Fax 801 484 6906 Web Page http www comtek com 2009 COMTEK All rights reserved Print Release Date 10 27 2009 55 NAT lt 357 West 2700 South Salt Lake City Utah 84115 e Phone 800
10. e disabled 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 If the main audio source is going to include music in formation you should disable it You may want to experiment to determine which position sounds most pleasing with the program source you intend to use Page 6 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 With the display disabled one segment is turned on as a power indicator Additionally the LOCK OUT indicator is illuminated indicating the tuning is disabled The VU meter and the ANTENNA indicator are unaffected Lock Out After the transmitting frequency has been determined the transmitter tuning function can be disabled with the LOCK OUT switch on the back of the transmitter This ensures that the transmitter operating frequency is not inadvertently changed The LOCK OUT indicator above
11. front panel begins to deflect Adjustment should be made so that normal speech or music deflects the meter mid scale Only very loud speech or music should deflect the VU meter full scale IMPORTANT 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 Channels 41 60 are wide band channels for use with COMTEK PR 216 receiver with 10 KHz deviation The PR 216 will tune the Phonak microEar channels 1 40 but with lesser fidelity Refer to page 10 for Channel Frequency Chart Multiple Channel Operation Simultaneous operation of more than two channels requires coordination of the frequencies that are used to avoid intermodulation interference Page 5 OPERATING INSTRUCTIONS continued To avoid this type of interference select frequencies from one of the standard groups see frequency group charts on page 11 or use COMTEK s frequency selection guide software to determine appropriate frequencies 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 Under normal operation the TONE switch should b
12. r transformers to reduce 60 Hz hum possibilities If the base station is to be used outside of a traditional rack mounted environment the screw in whip antenna should be free of any metallic objects when fully extended 12 1 2 inches Special Note When using the base station in close proximity to other audio equipment ensure that the audio equipment is not susceptible to RF interference This can be accomplished by temporarily installing the base station as per above and then while the base station is operating checking all audio outputs for uncharacteristic noise If a problem is found move the base station 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 Remote Antenna When the base station is rack mounted or when greater system range is required a remote antenna should be used For vehicle installation a 1 4 wave roof mount MO 1 4 wave or MAG 1 4 wave should be used For field or studio applications the COMTEK Phase Right Antenna PRA H 216 MHZ is an easy to use high performance omni antenna For high gain directional yagi type antennas and custom antennas contact COMTEK s application engineering department for assistance Please note Do not install screw in whip antenna if remote antenna is used Page2 Power Requirements The BST 25 base station is designed to be powered by 12
13. raph VU Meter displays audio input modula tion Two Digit Alpha Numeric Display shows operating channel Five Digit Numeric Display shows operating frequency Antenna Indicator displays deficient antenna condition Lock Out Indicator shows tuning has been disabled Antenna Telescopic antenna mounts directly into top of transmitter BNC RF output connector for optional external antenna FCC Compliance Type Accepted under Part 95 Power Requirements 12 Volts DC 300 mA max Frequency Response 80 Hz to 8 KHz Audio Distortion Less than 1 at 8096 modula tion Modulation Limiter Soft compressor type with high 25 dB linear overload protec tion attack time less than 1 ms recovery time 10 ms Audio Gain Control Greater than 40 dB Test Tone Generator 400 Hz 0 05 distortion Frequency Modulation 5 and 10 kHz deviation RF Output Power Set for 100 mW for FCC Part 95 Frequency Stability Better than 20 ppm digitally synthesized crystal controlled Operating Frequency 216 to 217 MHz Harmonic and Spurious Emissions Better than 55 dB below carrier Dimensions 6 1 2 wide x 19 4 high x 5 Ys deep Weight 44 oz NOTE Specifications subject to change without notice Page 15 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 b
14. 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 Audio Input Connections The base station transmitter has facilities for audio input from a mic line or speaker level source The mic line level audio input is a transformer balanced input and requires a standard XLR 3 male connector Unbalanced input is accomplished by shorting pin 3 to pin 1 audio ground leaving pin 2 as the audio source Please note when unbalanced input is used it is recommended that all audio input cables be kept as short as possible Set up a Select an appropriate location for the base station in accordance with Equipment Placement instructions b Set the MIC LINE switch located on the back of the base station transmitter to the appropriate position MIC position for low impedance microphones or LINE position for line level feed c Connect the audio source or microphone to the base station using the appropriate input Be sure to set the audio input level adjustment on the base station to its full counterclockwise position Page 3 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 Turn the main power switch on the front of the
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