BST 75-216 manual
Contents
1. overall performance the companded channels 41 60 must be used COMTEK receivers will automatically change to companded operation when set to channels 41 60 COMTEK non companded receivers as well as all in ear receivers having 5 kHz FM deviation may be used with COMTEK channels 41 60 if the compand switch located on bottom of transmitter is switched to the non companded position Non companded channels 01 40 can be custom installed for use with older all in ear receivers that are crystal controlled on standard group frequency channels Page8 BST 75 216 FREQUENCY INFORMATION Multiple Channel Operation When multiple transmitters more than two are used in the same proximity intermodulation interference can occur This condition is common to all radio receivers to some extent when multiple transmitters are used in the same operating area The RF signals will MIX together generating additional signals If these product frequencies are too close to a frequency which the receiver can also respond to you will experience intermodulation interference which may cause undesirable operation To avoid this type of interference when multiple transmitters are used in the same proximity transmitting frequencies must be coordinated by selecting from frequencies in the same group See group frequency chart on page 8 Transmitter Proximities For Multiple Channel Operation Frequency groups being transmitted should be2. separated by 2X the operating area and for best performance the group operating areas should have a 100 ft minimum separation Group 1 operating area j Group 2 operating area Transmitter separation Channel Programming Custom Flash Memory programming can be done before or after sale to accommodate special frequency groups Frequency selection software may be downloaded from COMTEK s website atwww comtek support html Page9 BST 75 216 ACCESSORIES Included Accessories 1 C 75 Carrying case 2 BST 75 216 Operator s manual 3 SLW 75 216 Short loaded whip antenna and bracket 4 AP 12V1 75 Universal switching power supply 12V DC output 5 BST 75 216 Base station transmitter Page 10 BST 75 216 ACCESSORIES Optional Accessories Im N Mini Mite 1 2 wave Phase Right PRA Phase Right HM 100 Behind the neck RMK75 4 Quad RMK75 2 Double 75 Single omni antenna coaxial antenna antenna mount directional boom microphone Q with 1 4 phone jack plug rack mount face plate rack mount face plate rack mount face plate Page 11 BST 75 216 SPECIFICATIONS Audio Inputs Line level balanced input 0 dBm for 80 modulation 420 dBm max XLR 3F Unbalanced input 5 dBm Max or two wire electret microphone with bias voltage for
3. 1 COMTEK All rights reserved Printed in U S A 01 05 2011 BST 75 216 Mini Base Station 5 Transmitter INTRODUCTION H 7 Xn PRIS BST 78 216 he BST 75 216 mini base station transmitter meets the highest professional standards while offering outstanding value and the most advanced technology available This versatile and innovative transmitter is simple to use yet it has sophisticated features such as Flash Memory 57 channel programmability with a synthesized manual 10 channel selectable user switch Plus a unique multi function RF indicator detects antenna problems bad or incorrect antenna and open coaxial cable for quick and easy trouble shooting The audio processing circuit produces full fidelity frequency response from 100 Hz to 10 kHz with very low residual FM noise and distortion To accommodate a greater variety of receivers the BST 75 216 can operate with non companded receivers or with companded receivers for higher fidelity sound reproduction with a system signal to noise ratio of up to 90 dB All this is designed into a sturdy compact all metal enclosure suitable for permanent rack mount installations or can be battery powered for stand alone portable applications Page 1 OPERATING INSTRUCTIONS Equipment Placement If the BST 75 216 base station is to be rack mounted a remote antenna must be used The base station should be mounted away from equipment
4. BST 75 216 OPERATOR S MANUAL 216 MHz Mini Base Station Transmitter CONTER ee BST 75 216 4540 7 5 3 0 1 DIGITALLY SYNTHESIZED TRANSMITTER SOIL 357 West 2700 South Salt Lake City Utah 84115 Phone 800 496 3463 e Fax 801 484 6906 e www comtek com TABLE OF CONTENTS Introduction EEN 1 Equipment Placement 2 Power Requirements E 2 Te E 3 Gere Whip 3 Audio Input Connections emgeet 4 Audio 0 4 Audio Processing 5 Front and Rear Panel Facilities 6 7 Frequency InfortfatiUB 8 9 000005000 siopa aE ARPE AAE MK ORE OR ert 10 11 Specificati NS 12 Watranty and Service tii duds 13 NOTE This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense 201
5. The audio is also equalized to add pre emphasis as well as a very sharp high frequency roll off circuit to minimize high frequency noise in the audio signal The total frequency response and performance of the system is however determined by the corresponding de emphasis and equalization used in the receiver In order to accommodate a greater variety of receivers the BST 75 216 transmitter incorporates the option to operate with receivers that have companded or non companded audio processing However the BST 75 216 transmitter must operate non companded with non companded receivers and companded only with receivers that incorporate companding processing A mismatch will result in unacceptable audio performance Basic Companding Theory The dynamic range of the audio signal is compressed in the transmitter ata2 1ratio The receiver then expands the audio signal at a complementary 1 2 ratio to restore the dynamic range of the audio signal to the original level and also to provide additional noise reduction when no audio signal is present 21 1 2 TRANSMITTER COMPRESSION EXPANSION RECEIVER 20dB 20dB RF LINK 8 1068 _ 8 OdB 0dB AUDIO TOAUDIO SOURCE J SYSTEM 40dB 4 40dB 80dB 80dB Page5 BST 75 216 FRONT PANEL 6 BST 75 216 8 99999999 DIGITALLY SYNTHESIZED TRANSMITTER
6. dset microphones Note For best performance the 1 4 mono jack should be considered the primary choice for shorter audio line feed Audio Adjustments In order to ensure the highest possible transmission fidelity the transmitter must be modulating at least 50 with normal speech 0 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 XLR 3 connector located on the back of the transmitter is used for line level balanced or unbalanced audio source up to 20 dBm c Setthe AF Gain Control on the back of the base station to fully counterclockwise 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 0 dB yellow LED Only peak level of speech or music should deflect the VU meter full scale into the last red LED Page4 OPERATING INSTRUCTIONS Audio Processing Circuit The audio processing system of the BST 75 216 incorporates a peak level compressor to prevent over modulation and reduce audio distortion at high levels This compressor has a very fast attack time and a carefully controlled decay time to optimize the dynamic performance of the audio processing system The VU meter will indicate this compressor action when the red LEDs are illuminated
7. e Lon Used for mobile applications OPTIONAL ANTENNA Used f bile applicati POWER SWITCH Turns the transmitter on or off POWER LED INDICATOR Illuminates when the power is on Q VU METER Displays the audio level being used for modulation See Audio Adjustment Section 9 ANTENNA INDICATOR Flashes when transmitter detects coaxial cable shorts and open conditions bad antenna load Q RACK MOUNTING SCREWS Used for mounting BST 75 216 to rack mounting panels Page6 BST 75 216 REAR PANEL Red Compand Non Compand Y Green Located on bottom of transmitter Ecma COMTEK Made ir LA SLC To AF OA POWER CHANNEL o OX VS 2 k aah T E XLR LINE 9 reponer E fer bb 208 DC INPUT JACK Requires 12V DC at 200 mA source Positive or negative center pin CHANNEL SELECTOR SWITCH Selects the frequency on which the transmitter will operate See Frequency Information Section EXTERNAL ANTENNA JACK BNC connector provides a standard 50 ohm RF output for use with an external antenna RF POWER SWITCH Adjusts the RF power output of the transmitter High 100 mW Mid 50 mW Low 25 mW D AUDIO LEVEL CONTROL This control is used to set the proper modulation level when referenced with the VU meter MIC LINE AUDIO INPUT XLR 3 accepts balanced line level input 1 4 ph
8. ecifications subject to change without notice or obligation Page 12 WARRANTY AND SERVICE Warranty COMTEK transmitters and receivers are warranted to be free from defects in workmanship and material under normal stand alone use and conditions for a period of two years from date of original purchase Items such as headphones earphones neckloops and cords are warranted to be free from defects in workmanship and material for a period of 90 days from the date of original purchase Batteries are not covered by this warranty Damage due to abnormal use extreme conditions misuse use of the product as a component of another product ill treatment and unauthorized modification and repairs are not covered by this warranty COMTEK is not liable for any consequential or punitive 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 OF THE PRODUCT FOR A PARTICULAR PURPOSE INCLUDING WITHOUT LIMITATION ANY WARRANTY THAT THE USE OF SUCH EQUIPMENT FOR ANY PURPOSE WILL COMPLY WITH APPLICABLE LAWS AND REGULATIONS Service Policy Warranty repairs must be done by COMTEK Only factory technicians are authorized to perform warranty service on the BST 75 216 transmitter Before returning the BST 75 216 for service a Return Authoriza
9. ed vertically polarized up to 15 feet away from the transmitter with the coaxial cable supplied The highest possible antenna placement away from any metallic object is best For high gain directional yagi type antennas and specialty antennas contact COMTEK s Technical Support Services Short Loaded Whip BNC Antenna If the BST 75 216 base station transmitter is to be used outside of the traditional rack mounted environment for stand alone mobile type applications the short loaded whip antenna SLW 75 216 can be used The d transmitter should be placed on a table or platform as high as possible and away from any metallic object The radiated output power of the transmitter with this short loaded whip antenna will not be as great as the remote antennas The BST 75 216 transmitter should be used only in the high power setting when the short loaded whip antenna is used Page3 EI 2 yl El 1 2 Wave a Mini Mite lt pE SLW 75 216 OPERATING INSTRUCTIONS Audio Input Connections The BST 75 216 base station transmitter uses an XLR 3F connector with a Combo phone jack The XLR portion of the connector will accept a true balanced or unbalanced line level signal up to 20 dBm The 1 4 mono jack portion of the connector can be used for AUX level audio or line level audio up to 5 dBm It also can be used to directly phantom power most two conductor electret hea
10. electret microphone 35 dBv at 5 K ohms with 1 4 phone jack Connectors XLR 3F Combo with 1 4 phone jack Barrel type 5 5mm X 2 1mm power jack DC BNC type RF output Operation Indicators LED bargraph VU meter LEDantenna load and SWR indicator LED DC power indicator Antenna Short loaded BNC whip antenna BNC RF output connector for optional external antenna FCC Compliance Type Certification and Type Acceptance under FCC Part 95 Power Requirements 12 Volts DC 200 mA max Frequency Response 100 Hz to 10 KHz Audio Distortion Less than 196 at 80 modulation Audio Gain Control Limited to 20 dB Modulation Limiter Peak compressor type with high linear overload protection 25 dB Attack time less than 1 ms recovery time 10 ms Audio Processing Companded and non companded to accommodate a variety of receivers RF Output Power Maximum power output for FCC Part 95 100 mW Frequency Stability Better than 0 002 digitally synthesized crystal controlled Frequency Modulation 10 KHz deviation companded 5 KHz deviation non companded Operating Frequency 216 0125 to 216 9750 MHz 57 channels Custom factory programmed to 10 of 19 available high fidelity companded channels or may be programmed to 10 of 38 standard non companded NB channels Harmonic and Spurious Emissions Better than 50 dB below carrier Dimensions 33 4 X 15 8 X5 1 4 deep Weight 17 oz NOTE Sp
11. one jack accepts AUX input or 2 conductor electret microphone B COMPAND NON COMPAND SWITCH For high fidelity operation switch must be in compand position when using companded receivers and in non companded position when using non companded receivers Page7 BST 75 216 FREQUENCY INFORMATION SELECTED CHANNELS STANDARD PROGRAM POSITION FREQUENCY WIDEBAND COMPANDED CHANNELS 216 0250 216 0750 216 1750 216 2750 216 4250 216 5250 AVAILABLE 216 MHz FLASH MEMORY PROGRAMMABLE CHANNELS Channels CHANNEL FREQUENCY 216 0125 MHz 216 0375 MHz 216 0625 MHz 216 0875 MHz 216 1125 MHz 06 216 1375 MHz 216 1625 MHz 08 2161875 MHz 09 216 2125 MHz 216 2375 MHz 216 7250 216 8250 216 9250 216 2625 MHz 216 9750 GROUP FREQUENCY CHARTS SWITCH CHANNEL POSITION FREQUENCY GROUPA 41 1 216 0250 44 3 GUEST 7 208722510 216 5625 MHz 216 5875 MHz 216 6125 MHz 216 6625 MHz 216 6875 MHz 216 7125 MHz 10 2169750 216 0375 216 2750 216 7625 MHz Aleng 216 9250 216 1750 216 4250 216 8250 SOHO 16 9375 MHz 16 9625 MHz 16 9875 MHz 31 36 16 8875 MHz 37 216 9125 MHz LI Companded Channels 41 46 2162750 MHz 4s 2163750 49 2164250 MHz 6 9250 MHz 216 9750 MHz Note For best audio fidelity and
12. that uses large power transformers to reduce 60 Hz hum possibilities Special Note When using the base station in close proximity to other audio equipment ensure that the audio equipment is not susceptible to RFinterference This be accomplished by temporarily installing the base station 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 Technical Support Services for assistance Power Requirements The BST 75 216 base station is designed to be powered by 12 volts DC The standard barrel type power jack 5 5mm X 2 1mm is nonpolar and will accept either 12 volt DC on the center pin The switching power supply adaptor which is included is a universal input type that will accept 100 240 volt 47 63 Hz AP 12V1 75 The on off switch on the front panel of the base station transmitter should be turned to the off position when the power plug is initially plugged into the transmitter Page2 OPERATING INSTRUCTIONS Remote Antenna When the BST 75 216 base station transmitter is to berack mounted for permanent installation a remote antenna must be used For high performance when greater coverage is required the Phase Right or Mini Mite 1 2 wave omni antenna should be used These antennas must be plac
13. tion 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 OXONII 357 West 2700 South e Salt Lake City Utah 84115 e Phone 800 496 3463 Fax 801 484 6906 e www comtek com E mail sales comtek com NAT K 357 West 2700 South Salt Lake City Utah 84115 e Phone 800 496 3463 e Fax 801 484 6906 e www comtek com
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