Comtek BST-25 Operator'S Manual Download Page 1 | Manualshive

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Synthesized
Base Station
Transmitter

BST-25 OPERATOR’S MANUAL (216 MHz)

357 West 2700 South • Salt Lake City, Utah 84115 • Phone: (800) 496-3463 • Fax: (801) 484-6906 • http://www.comtek.com

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Summary of Contents for BST-25

Page 1: ...Synthesized Base Station Transmitter BST 25 OPERATOR S MANUAL 216 MHz 357 West 2700 South Salt Lake City Utah 84115 Phone 800 496 3463 Fax 801 484 6906 http www comtek com ...

Page 2: ...ighest 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 m...

Page 3: ...tation 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 antenn...

Page 4: ...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...

Page 5: ...ing 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 Als...

Page 6: ...t 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 25 216 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 COMT...

Page 7: ...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 If the primary audio source is going to be speech you should enable this ...

Page 8: ... 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 cha...

Page 9: ...ing the LOCK OUT switch rear panel to ON DIGITAL FREQUENCY DISPLAY Displays the frequency on which the transmitter is operating 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 ...

Page 10: ... RF output for use with an external antenna SPEECH ENHANCEMENT SWITCH Enables and disables speech enhance feature Enable this function switch up for speech and disable it switch down for music 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 MIC LINE SWITCH Se...

Page 11: ...52 53 54 55 56 57 58 59 60 CHANNEL FREQUENCY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 21 22 23 24 25 26 27 28 29 30 31 216 0125 MHz 216 0375 MHz 216 0625 MHz 216 0875 MHz 216 1125 MHz 216 1375 MHz 216 1625 MHz 216 1875 MHz 216 2125 MHz 216 2375 MHz 216 2625 MHz 216 2875 MHz 216 3125 MHz 216 3375 MHz 216 3625 MHz 216 3875 MHz 216 4125 MHz 216 4375 MHz 216 5125 MHz 216 5375 MHz 216 5625 MHz 216 ...

Page 12: ...875 MHz 216 9875 MHz GROUP B CHANNEL FREQUENCY 3 5 12 22 38 216 0624 MHz 216 1125 MHz 216 2875 MHz 216 5375 MHz 216 9375 MHz GROUP C CHANNEL FREQUENCY 17 23 30 34 39 216 4125 MHz 216 5625 MHz 216 7375 MHz 216 8375 MHz 216 9625 MHz GROUP D CHANNEL FREQUENCY 41 44 51 55 60 216 0250 MHz 216 1750 MHz 216 5250 MHz 216 7250 MHz 216 9750 MHz GROUP 1 CHANNEL FREQUENCY 42 49 53 58 216 0750 MHz 216 4250 MHz...

Page 13: ...e Compand Switch must be set to the ON position for automatic companded and non companded operation with channel selection The OFF position is only used for testing BST 25 INTERNAL ADJUSTMENTS 216 MHz Page 12 ...

Page 14: ...BST 25 ACCESSORIES 216 MHz Page 13 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 15: ...s 1 RDA 2 Remote dipole antenna 2 PRA Phase Right coaxial antenna 3 MO 1 4 wave vehicle installation antenna or MO 1 4 wave magnetic mount antenna 4 PRA Phase Right antenna mount 5 RMK 25 Single rack mount face plate 6 RMK 25 2 Double rack mount face plate ...

Page 16: ...l 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 80 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 Fre...

Page 17: ...TESANY 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 B...

Page 18: ...357 West 2700 South Salt Lake City Utah 84115 Phone 800 496 3463 Fax 801 484 6906 http www comtek com ...

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