Comtek Communications Technology BST25-216 Low Power Communications TX User Manual Manual
Comtek Communications Technology Inc Low Power Communications TX Manual
Contents
- 1. Manual
- 2. Revised Manual
Manual
EST-25 OPERATOR’S MANUAL (216 MHz) Synthesized Base Station Transmitter GOMTEK EST-25 3/‘1 (caccm 1214 z fi< ;11111~1v~11 mm L 111 1<1:1~'11 1111111 11 -1.1 1».1111>z~1—n11~‘11.11: -. 11...11..11 INTRODUCTION EST-25 (216 MHz) Synthesized Base Station Transmitter The EST-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 operates with the COMTEK PR—216 for higher fidelity when used in wide-band operation. A transmitter and receiver system may be used for personal suing, for tour guide applications, language interpretation, and for assistive listening applications The BST—ZS 216 MHz also operates with the Phonak microEar VHF in-ear receiver in the narrow band mode. This receiver is used for totally discrete cuing and prompting, IFB for broadcast and film production, and for other discrete applications Page 1 OPERATING INSTRUCTIONS 3} Equipment Placement If the BET-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 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, insure 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—l 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 ifremote antenna is used. Page 2 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, 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-2 to pin-1 (audio ground), leaving pin-3 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) "fl 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 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 l / 2 inches). During normal operation the antenna indicator should not flash. Tum 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 insure the highest possible transmission fidelity, the transmitter must be modulating at least 50% with normal speech (-3 dB on the VU metert This adjustment is made in the following manner: Page 4 |,/ at Insure 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 settingt ”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 EST-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 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 1 1), 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 EST-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. 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. lfthe 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. 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, insuring 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 insures that the transmitter operating frequency is not inadvertently changed. The ”LOCK OUT” indicator (above the first numeric digit on the display) will illuminate indicat- ing 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 EST-25 FRONT PANEL GDMTEK EST-25 swmssrzrp wmm 3°li EDS ll 0 a o 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 (one. 0 TUNING swrrcu: Selects the frequency on which the transmitter will operate. o LOCK OUT INDICATOR: Illuminates when the “TUNING” switch is disabled by setting the ”LOCK OUT” switch (mar panel) to "ON” 6 DIGITAL FREQUENCY DISPLAY: Displays the frequency on which the transmitter is operating 6 ANTENNA INDICATOR: Flashes when the transmitter senses a deficient antenna condition. 0 vu METER: Dis la sthe level of audio bein transmitted. Used to £5. Y 3 adjust the “LEV (rear panel) )control. 0 DIGITAL CHANNEL DISPLAY: Displays the channel on which the transmitter is operating. 0 POWER SWITCH: Tums the transmitter on or off. Page 8 W HST-25 REAR PANEL (216 MHz) S/N'fi rec chEZBsrzs—zls mommy P1N|GND P1N2nzv mom | LEVEL | MIG | l DOMTHK Est-25 was m u en SLC w ll ll‘ll‘. @ LOCK OUT SWITCH: Disables the (front panel) "TUNING" switch, locking the transmitter on one frequency. (D no "firm JACK: Requires 12 VDC at 500 mA (Pin-1 ground, pin—2 +12 volts . @ EXTERNAL ANTENNA JACK: BNC connector provides a standard 50 ohm RF Output for use with an external antenna. is SPEECH ENHANCEMENT SWITCH: Enables and disables speech enhance feature. Enable this function (switch up) for speech and disable l it (switch clown) for music. @ LEVEL CONTROL: This control should be adjusted to 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). (13 MIC/LINE swn'cu: Selects the desired audio input sensitivity. Page 9 EST-25 FREQUENCY CHART CHANNEL NARROW BAND CHANNELS 11m use wnh 11.0an mmmEar) FREQUENCY 216.0125 MHZ FREQUENCY 216.7375 MHZ 216.8125 MHZ CHANNEL 1 216. 0375 MHZ 216.8375 MHz 216 0625 MHZ 35 216.8625 MHZ 1 216. 0875 MHZ 36 2168875 MHZ 1 216.1125 MHZ 37 2169125 MHZ 216.1375 MHZ 216.9375 MHZ 216.1625 MHZ 216 9625 MHZ 216.1875 MHZ 216.2125 MHZ 216.2375 MHZ ‘i 216 9875 MHZ 15m use wi o 'm< 111 11.1m1vm) 216.2625 MHZ 41 216.0251) MHZ 42 216. 0750 MHZ 216.2875 M1121 12 143 L 216.1250 MHZ 13 216.3125 M112 1750 1/1112 14 2163375 M112 216.3625 MHZ 216.3875 MHZ 216.4125 MHZ 21 3750 MHZ 216.4375 MHZ gm 4250 MHZ 216.5125 MHZ 216 5375 MHZ 216.5625 MHZ 216.5875 MHZ 216.6125 MHZ 216.5250 MHZ 216. 5750 MHZ ,, 216 6750 M112 1 216. 7250 M112 55W 216.6375 MHZ 216.6625 MHZ 56" 57 216.6875 MHZ 216.7125 MHZ 216 8750 MHZ 1’ {a 1712 W 17 3977 1 216925014112 216.7375 MHZ 60 1. 216.9750 MHZ 31 216.7625 MHZ Page 10 “1 1 I 3111 EST-25 216 MHZ NARROW BAND FREQUENCY GROUPS For Phonak mlcmEar 5 KHZ deviation EST-25 216 MHZ WIDE BAND FREQUENCY GROUPS For COMTEK I’ll—216 10 KHZ deviatinn GROUP A GROUP 1 CHANNEL FREQUENCY CHANNEL FREQUENCY 1 216.0125 MHZ 216.0250 MHZ 8 216.1875 MHZ“ 44 216.1750 MHZ 12 216.2875 MHZ 46 216.2750 MHZ 26 216.6375 MH27 53 216.6250 MHZ 34 216.8375 MHZ 216.8250 MHZ GROUP B GROUP 7. CHANNEL FREQUENCY CHANNEL FREQUENCY 4 216.0875 MHZ 216.0750 MHZ 10 216.2375 MHZ 216.2250 MHZ 14 216.3375 MHZ 47 216.3250 MHZ 28 216.6875 MHZ 54 216 6750 MHZ 36 216.8875 MHZ 58 216.8750 MHZ GROUP C GROUP 3 CHANNEL FREQUENCY CHANNEL FREQUENCY 5 216.1375 MHz 43 216.1250 MHZ 12 216.2875 MHz 46 216.2750 MHZ 16 216.3875 MHZ 48 216.3750 MHZ 30 216.7375 MHZ 55 216.7250 MHZ 38 216.9375 MHZ GROUP D CHANNEL FREQUENCY 216.9250 MHZ GROUP 4 CHANNEL FREQUENCY 216.1875 MHZ 216.3375 MHZ 44 47 216.1750 MHL 216.3250 MHZ 216.4375 MHZ 49 216.4250 MHZ 216.7875 MHZ 216.9875 MHZ Page 11 56 60 216.7750 MHZ 216.9750 MHZ EST-25 (216 MHZ) SPECIFICATIONS 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—z Male power input 12 volts BNC type RF output connector Operation Indicators; LED Bargraph 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: so Hz to 8 kHz Audio Distortion: Less than 1% at 80% modulation Modulation Limiter: Soft compressor type with high (25 dB) linear overload protec- tion, attack time less than 1 ms, recovery time 10 m5 Audio Gain Control: Greater than 40 dB Test Tone Generatan 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/z" wide x 13h" high x 5 5/5" deep Weight: 44 oz, NOTE: Specifications sub|ect to change without notice Page 12 WARRANTY COMTEK warranlb this produfit h) be true 1mm detecb in workmanship tirid material under normal use and (auditions tor a pennd Of one year t'nnn date or original purdmse‘ Items such as hatterm, lit-(Hoops, and cords am not cuvered by the warranty Damage due to misuse, in treatment and unauthurized modification and repairs are not covered by this warranty. COMTEK Is not Iidble mr cunbequenhal damages. arising out US any Iaiiure Of the equipment to pPI‘furm as inlcnded. COMIEK bhal] bear no responsibility Ur obligalmn with respect to the manner of use at any equipment bind by Ii COMTEK SPECIFJCALLY DISCLAIMS AND NEGATES ANY WARRANTY OE MERCHANTABILITY OR I'ITNEss FOR A PARTICbLAR PURPOSE or sum EQUIPMENT INCLUDING, WITHOUT LIMITATION, ANY WARRANTY THAT THE USE OF SUCH EQUIPMENT FOR Aiw PURPOSE WILL COMPLY WITH APPLICABLE LAws AND REGULATIONS. Servire Policifs Warranty repairs must be done by COMTEK. 0.in Maury Iechmcxans am authorized to perform Warramy service on the BS v25 (Lansmiflel‘. Before returning the 35125 for servite, a Remm Aulhnrimtinn Number Shaina be nbinined frum the Sen'lcn' department by Lalllng 1-800—496—3463 or I—soummz Return the unit m the iflfmry wrth the migiml or comparable padring COMTEK mu pay {or insurance tnd ground rmim shipping rush in the United Stams for all Wa|mnly service, 357We<127ufl Souih - Salt] aka Cm; Uinh 54115 Phone (8110) 490—3463 . FAA (sun 4846906 Web Page hnpz/ in Mt QImIL-k mm
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