BST-25 - Comtek
Contents
1. NOTE The COMPAND switch must be set to the OFF position for use with Walkman FM band type receivers and TV monitors Must be set to the ON position for use with PR 25 and PR 216 TV 5 6 receivers Page 13 BST 25 ACCESSORIES 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 14 BST 25 ACCESSORIES Optional Accessories 1 RDA 2 Remote dipole antenna 2 PRA Phase Right coaxial antenna 3 MO 1 4 wave vehicle installation antenna or 5 MO 1 4 wave magnetic mount antenna 4 PRA Phase Right antenna mount E 5 RMK 25 Single rack mount face plate Ea 6 RMK 25 2 Double rack mount face plate Te j Page 15 BST 25 TV 5 6 ATIONS 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 Bargraph VU Meter displays audio input modu lation Two Digit Alpha Numeric Display shows operating channel Five Digit Numeric Display shows operating frequency Antenna Indicator displays deficient antenna conditi2. 81 800 MHz GROUP THREE CHANNEL FREQUENCY 76 300 MHz 76 900 MHz 77 200 MHz 77 700 MHz 77 900 MHz 79 000 MHz 80 200 MHz 81 900 MHz Page 12 82 500 MHz 82 800 MHz 83 000 MHz 83 400 MHz 84 100 MHz 85 100 MHz 85 900 MHz 87 100 MHz GROUP TWO CHANNEL FREQUENCY 82 300 MHz 82 600 MHz 84 900 MHz 85 500 MHz 86 300 MHz 86 500 MHz 87 000 MHz 87 400 MHz GROUP THREE CHANNEL FREQUENCY 82 200 MHz 82 400 MHz 82 700 MHz 83 100 MHz 83 700 MHz 84 500 MHz 85 700 MHz 87 300 MHz BST 25 INTERNAL ADJUSTMENTS H C aj 9 A T EZ B er I4 RF POWER LEVEL DO NOT ADJUST S me Fr O fF E ore Call ov 9 COMPAND o o o A EG E9 WB DEVIATION ES SWR SENSITIVITY B WBH COMPANDOR SYMMETRY d COMPRESSION Gre 9 NB DEVIATION mz
3. 0 DISPLAY SWITCH This switch disables the digital display to conserve current when used with a battery 9 TONE SWITCH Enables disables the internal 400 Hz test tone e 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 G DIGITAL FREQUENCY DISPLAY Displays the frequency on which the transmitter is operating G ANTENNA INDICATOR Flashes when the transmitter senses a deficient antenna condition VU METER Displays the level of audio being transmitted Used to adjust the LEVEL rear panel control DIGITAL CHANNEL DISPLAY Displays the channel on which the transmitter is operating POWER SWITCH Turns the transmitter on or off Page 8 51 25 REAR PANEL S N F C C ID C6ZBST25 ANTENNA DC INPUT LEVEL 0 ON O PIN1 GND 9 p O O PIN 4 12V A J 8 LOCK OUT T CON TEK BST 25 ur IN U S lt oe UT TZE 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 functi
4. BST 25 TV 5 6 OPERATOR S MANUAL 76 88 MHz Synthesized Base Station Transmitter COM K 357 West 2700 South Salt Lake City Utah 84115 e Phone 800 496 3463 Fax 801 484 6906 http www comtek com INTRODUCTION BST 25 TV 5 6 Synthesized Base Station Transmitter comwnEx 8 ZO Oa a 1 he BST 25 is a low power auxiliary base station transmitter designed to operate under Part 74 of the FCC Regulations in the unused TV channel 5 and TV channel 6 spectrum 76 2 to 87 8 MHz This transmitter along with a personal receiver is used ina TV production studio for IFB and talent cueing It may also be used on remote location from an ENG truck for the same application In motion picture production the BST 25 is used as a low power auxiliary base station transmitter located on site with the sound recording equipment Directors boom operators and others may receive with a personal receiver and headphone the high fidelity transmission from the BST 25 to monitor sound track audio being recorded This transmission or Confidence Channel may also be used as an IFB for talent or crew members 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 power transformers to reduce 60 Hz hum possibilities If the base stati
5. NEL 6 FREQUENCY CHART CHANNEL FREQUENCY CHANNEL FREQUENCY 82 100 MHz 85 100 MHz 82 200 MHz 85 200 MHz 82 300 MHz 85 300 MHz 82 400 MHz 85 400 MHz 82 500 MHz 85 500 MHz 82 600 MHz 85 600 MHz 82 700 MHz 85 700 MHz 82 800 MHz 85 800 MHz 82 900 MHz 85 900 MHz 83 000 MHz 86 000 MHz 83 100 MHz 86 100 MHz 83 200 MHz 86 200 MHz 83 300 MHz 86 300 MHz 83 400 MHz 86 400 MHz 83 500 MHz 86 500 MHz 83 600 MHz 86 600 MHz 83 700 MHz 86 700 MHZ 83 800 MHz 86 800 MHz 83 900 MHz 86 900 MHz 84 000 MHz 87 000 MHZ 84 100 MHz 87 100 MHz 84 200 MHz 87 200 MHz 84 300 MHz 87 300 MHz 84 400 MHz 87 400 MHz 84 500 MHz WIDE BAND CHANNELS for use with FM tunable receivers 84 600 MHz 6 54 87 500 MHz 84 700 MHz 6 55 87 600 MHz 84 800 MHz 6 56 87 700 MHz 84 900 MHz 6 57 87 800 MHz 85 000 MHz TV 6 Audio 87 750 MHz Page 11 BST 25 BST 25 TV CHANNEL 5 TV CHANNEL 6 FREQUENCY GROUPS FREQUENCY GROUPS GROUP ONE GROUP ONE CHANNEL FREQUENCY CHANNEL FREQUENCY 74 400 MHz 76 700 MHz 77 100 MHz 77 600 MHz 78 200 MHz 79 500 MHz 80 300 MHz 81 700 MHz GROUP TWO CHANNEL FREQUENCY 76 600 MHz 76 800 MHz 77 400 MHz 79 400 MHz 79 900 MHz 80 800 MHz 81 500 MHz
6. 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 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 Page 7 BST 25 FRONT PANEL COMTEK BST 25 SYNTHESIZED TRANSMITTER TUNING A LOCK OUT ANTENNA EM y a 2 e S m o 5 69300 5 pd la Q A 7 S10 BI 0 9 G DG DISPLAY TONE FREQUENCY MHz CHANNEL POWER
7. 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 5 Phone 800 496 3463 Fax 801 484 6906 Web Page http www comtek com CX QJ NAT K 357 West 2700 South Salt Lake City Utah 84115 e Phone 800 496 3463 Fax 801 484 6906 http www comtek com
8. d 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 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 shorten the telescoping whip antenna by 2 inches and again check the indicator Continue this procedure until the indicator remains off If you experience trouble please contact COMTEK s application engineering department for assistance If you are using an external type antenna DO NOT install the telescoping antenna Instead connect the coaxial feed line for the external antenna to the external antenna port on the back of the BST 25 Note For optimum performance when using the telescoping whip antenna the transmitter should be placed on a large metallic surface Adjustment of antenna length for a No Flash condition on antenna indicator will ensure maximum radiation Page 4 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 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 se
9. on 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 74 Power Requirements 12 Volts DC 300 mA max Frequency Response 80 Hz to 15 kHz Audio Distortion Less than 0 596 at 80 modulation Modulation Limiter Soft compressor type with high 25 dB linear overload protection 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 10 kHz deviation for narrow band channels 575 kHz deviation for wide band channels RF Output Power Set for 50 mW for FCC Part 74 Frequency Stability Better than 0 002 digitally synthesized crystal controlled Operating Frequency 76 2 to 87 8 MHz Harmonic and Spurious Emissions Better than 55 dB below carrier Dimensions 6 1 2 wide x 19 4 high 5 Ys deep Weight 44 oz NOTE Specifications subject to change without notice Page 16 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
10. on switch up for speech and disable it Switch down for music 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 microphone Pin 1 ground Q MIC LINE SWITCH Selects the desired audio input sensitivity Page9 BST 25 TV CHANNEL 5 FREQUENCY CHART CHANNEL FREQUENCY CHANNEL FREQUENCY 76 200 MHz 5 31 79 200 MHz 76 300 MHz 5 32 79 300 MHz 76 400 MHz 5 33 79 400 MHz 76 500 MHz 5 34 79 500 MHz 76 600 MHz 5 35 79 600 MHz 76 700 MHz 5 36 79 700 MHz 76 800 MHz 5 37 79 800 MHz 76 900 MHz 5 38 79 900 MHz 77 000 MHz 5 39 80 000 MHz 77 100 MHz 5 40 80 100 MHz 77 200 MHz 5 41 80 200 MHz 77 300 MHz 5 42 80 300 MHz 77 400 MHz 5 43 80 400 MHz 77 500 MHz 5 44 80 500 MHz 77 600 MHz 5 45 80 600 MHz 77 700 MHz 5 46 80 700 MHz 77 800 MHz 5 47 80 800 MHz 77 900 MHz 5 48 80 900 MHz 78 000 MHz 5 49 81 000 MHz 78 100 MHz 5 50 81 100 MHz 78 200 MHz 5 51 81 200 MHz 78 300 MHz 5 52 81 300 MHz 78 400 MHz 5 53 81 400 MHz 78 500 MHz 5 54 81 500 MHz 78 600 MHz 5 55 81 600 MHz 78 700 MHz 5 56 81 700 MHz 78 800 MHz 5 57 81 800 MHz 78 900 MHz 5 58 81 900 MHz 79 000 MHz 5 59 82 000 MHz 79 100 MHz TV 5 Audio 81 750 MHz Page 10 BST 25 TV CHAN
11. on 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 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 L TV 5 6 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 volts DC A power adaptor is furnished for use with standard 110V AC The on off swi
12. tch 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 amic 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 base station to the ON position The front display should now be illuminate
13. tting 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 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 Frequency Selection The BST 25 base station transmitter has the ability to operate on one of 119 preset channels between 76 200 MHz and 87 800 MHz TV channel 5 and TV channel 6 Channels are designated by both frequency and channel number Channels which operate in the TV 5 spectrum are prefixed with a 5 5 50 is 81 100 MHz channels operating in the TV 6 spectrum are prefixed with a 6 6 50 is 87 100 MHz This channel rastering makes it easy to determine which TV band you are operating on Page 5 OPERATING INSTRUCTIONS continued If you are using this transmitter in a area which does not have a TV station operating on channel 5 you can use one of the channels inthe TV 5 range Conversely if the area does not have a station on TV 6 you can operate on one of the TV 6 channels Note It is unlawful to operate this transmitter in a band that is already occupied by a TV station After you have determined the channel on which yo
14. u are going to operate use the TUNING button to select the channel that you have chosen See charts on pages 10 and 11 for preset selectable frequencies Multiple Channel Operation Simultaneous operation of more than two channels requires coordination of the frequencies that are used to avoid intermodulation interference 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 be disabled Page 6 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 information you should disable it You may want to experiment to determine which position sounds most pleasing with the program source you intend to use Display On and
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