Comtek Communications Technology M175 Personal body-worn communication transmitter User Manual C 175rpt tableofcontent wpd
Comtek Communications Technology Inc Personal body-worn communication transmitter C 175rpt tableofcontent wpd
User Manual
M-175 OPERATOR’S MANUAL (PRELIMINARY) M-175 Personal Communication Transmitter 357 West 2700 South • Salt Lake City, Utah 84115 • Phone: (800) 496-3463 • Fax: (801) 484-6906 • http://www.comtek.com TABLE OF CONTENTS Introduction ........................................................... Setup ............................................................................... Controls .................................................................. Battery Removal /Replacement ...................................... Battery Charging ...................................................... Auxiliary Audio Input Operation ................................... 6-7 Snap-On Belt Clip ................................................. Frequency Selection .............................................. Frequency Information ......................................... Optional Accessories ............................................ 10 Specifications ......................................................... 11 Warranty and Service .................................................. 12 © 2007 COMTEK® All rights reserved. Printed in the U.S.A. 0107M175 INTRODUCTION M-175 Personal Communication Transmitter he M-175 transmitter offers the ultimate performance and versatility for applications where one-way personal communication is required. This compact, personal transmitter is ideal for instructors and presenters who must communicate with persons some distance away or in a noisy environment. The M-175 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 personal communications system. The audio processing circuit produces full fidelity frequency response from 100 Hz to 10 kHz in the companded or non-companded mode to accommodate a greater variety of receivers. Operating under F.C.C. Regulation Part 90 allows a greater transmission range and reliability than is customary with 72-76 MHz systems. Page 1 M-175 SETUP Setup a. Check to ensure that the M-175 transmitter’s radio frequency channel is the same as the associated COMTEK receiver’s channel. (Channels are indicated by the rotary channel selector switches on the back of the transmitter. See page 8.) b. Open the battery door cover on the transmitter (see page 4) and insert a new nine volt alkaline battery (Eveready E522 or equivalent). This type of battery will offer up to 16 hours of operation. Replace the battery before every use if the demand for fail-safe operation outweighs battery cost. The use of carbon batteries is not recommended. NOTE: If a rechargeable battery is to be used, ensure that it has been allowed to charge at least twelve hours to bring it to full charge (see page 5 for battery charger instructions). c. Connect the microphone to the transmitter by inserting the microphone plug into the receptacle on the top of the transmitter. The transmitter is operating when the transmitter power switch is turned on and the battery status/on indicator illuminates. NOTE: The 48-inch microphone cord also functions as part of the transmitter’s antenna system. For optimum performance, this cord should be fully extended. Coiling or bunching the microphone cord may reduce the range of the transmitter. The transmitter should be carried by the snap-on belt clip (included) or in a pocket or belt-clip pouch. d. In a situation where an extremely loud voice or a very soft voice is used, it is necessary to adjust the audio input gain control while observing the audio “voice” level modulation indicator. A full bright LED indicates full audio compression at 100% modulation. For best performance, the audio input gain should be adjusted for some low level LED luminescence during normal audio levels with occasional full bright peaks indicating 100% modulation. Page 2 M-175 CONTROLS n COMPAND AUTO / OFF SWITCH: This switch overrides the automatic selection of the companded channels to non-companded operation. o CHANNEL SWITCHES: These rotary switches are used to set the transmitter to the desired operating frequency. (See page 9 and 10 for frequency selection chart.) p BATTERY COMPARTMENT: The battery compartment features a hinged battery cover and an alignment system that ensures proper battery polarity. Battery installation and removal is facilitated by simply manipulating the bottom of the battery. q AUXILIARY AUDIO INPUT JACK: Allows transmitter to use line level, earphone level, or fixed AUX as an audio source. r AUDIO “VOICE” MODULATION INDICATOR: This indicator is used in making adjustment with the Audio Input Gain Control. s MIC / ANTENNA JACK: This jack accepts an electret type microphone having a 48” long cord with a micro-mini 2.5mm mono plug. The microphone cord functions as part of the transmitter’s antenna system and must be in place for auxiliary audio input operation. If microphone function is not necessary, the optional microphone switch should not be on for this operation. t POWER / BATTERY STATUS INDICATOR: This LED indicator will illuminate continuously when the unit is on, indicating normal operation. When the battery voltage drops below 6 volts, the LED will flash rapidly, indicating that a new battery is needed. u OPTIONAL MIC SWITCH: This switch turns off the microphone without turning off the transmitter carrier. v AUDIO INPUT GAIN CONTROL: This is a microphone and AUX level input gain control. This control is used with the “Voice” modulation indicator. w ON / OFF SWITCH: This switch turns the transmitter on and off. Page 3 M-175 BATTERY REMOVAL / REPLACEMENT Low Battery Indicator The LED on the top of the transmitter indicates the status of the battery as well as indicating that the unit is turned on. When the transmitter is turned on, the LED illuminates. If the battery is low, the green LED will blink rapidly to warn you that the battery will soon be dead. Replace a low battery immediately. Battery indicator LED Battery Removal / Replacement Pull back battery door latch and allow battery cover door to spring open. To remove battery, simply manipulate the bottom of battery out of the compartment and remove. To insert battery, face battery with negative terminal in line with large hole in battery compartment, press battery into compartment and close battery door until it snaps shut. Note: It is not possible to put battery in backwards. Page 4 M-175 BATTERY CHARGING Battery Charging 1. Make sure that a seven cell 9 volt Ni-MH rechargeable battery is used with a minimum of 200 mAh capacity. (Alkaline batteries must not be charged.) TANT IMPOR 2. Make sure the M-175 is turned OFF. 3. Note that the red charging indicator on the charger is ON when the M-175 is plugged into the charger through the audio output jack. 4. When using the NBC 9-2C charger allow the battery to charge for 14 hours for a full charge. Unit must then be unplugged. When using the NBC 9-3-1 digital fast charger the charger will automatically end the charge cycle and the red LED will change to green. With this charger the unit may be left in the charger until the unit is used. 5. Periodically open the battery compartment on stored COMTEK units to check for battery leakage. If a battery is leaking, it must be discarded, and the battery compartment must be cleaned or returned to COMTEK’s service department for repairs. NBC 9-2C 14-hour charger NBC 9-3-1 digital fast charger Page 5 M-175 AUXILIARY AUDIO INPUT OPERATION Auxiliary Audio Input Operation The M-175 transmitter may transmit a variety of audio sources such as tape and C.D. players, TV and VCR’s, or any audio device having an auxiliary or line level audio output. The auxiliary input cable supplied with the M-175 transmitter (CB-36 ST) will operate with any device having a mini 3.5 mm jack, stereo or mono, and with line level or earphone level output. To accommodate a variety of specialty applications, auxiliary input cables with RCA phono plug, 1/4” audio phone plug, and XLR connectors are available from COMTEK. Setup a. Connect the microphone to the transmitter by inserting the microphone plug into the receptacle on the top of the transmitter. Note: The microphone cord functions as part of the transmitter’s antenna system and must be in place for auxiliary audio input operation. If microphone function is not necessary, the optional microphone switch should not be on for this operation. b. Connect the proper auxiliary input cable to the audio source. Connect the right-angle mini plug end of the auxiliary input cable in the “AUX” input jack of the M-175 transmitter. Note: Check to ensure that the audio source is a line level, earphone level, or fixed AUX level output. Page 6 M-175 AUX OPERATION (Cont.) / SNAP-ON BELT CLIP c. Turn on the transmitter with program from the audio source being fed to the transmitter. Observe the audio “voice” level modulation indicator. A full bright LED indicates full audio compression at 100% modulation. For best performance, the audio input gain should be adjusted for some low level LED luminescence during normal audio levels with occasional full bright peaks indicating 100% modulation. d. When using the auxiliary audio input with the microphone plugged into the transmitter, priority should be given to the microphone gain adjustment. The mixing balance between the auxiliary audio and the microphone should be made with the volume control of the auxiliary audio source. Note: The optional microphone switch only affects the microphone. It does not affect the auxiliary audio input. M-175 SNAP-ON BELT CLIP (Included) STEP 2: Rotate belt clip down onto case. Apply pressure on both sides of clip, snapping clip retainers into slots. Belt clip installation Clip retainer STEP 1: Hook belt clip retaining lip over front case ridge. Retainer slot Belt clip removal indent Belt clip removal Flex out and pull down with your thumb or a large coin (quarter) to unsnap belt clip from case. Page 7 M-175 FREQUENCY SELECTION Frequency Selection (72-76 MHz) The M-175 transmitter can operate on one of 88 available channels between 72-76 MHz. COMTEK channel designations indicate a specific frequency which can be used in the companded or non-companded mode of operation. When the “compand auto/off switch” is in the “auto” position, the M-175 transmitter must be used only with receivers having 2:1 audio companding processing. When the “compand Auto/Off switch” is in the “off” position, standard non-companded receivers must be used. Compand Switch After you have determined the channel on which you are going to operate, position the two rotary switches to indicate the channel. The left rotary switch is for tens and the right rotary switch is for ones. To select channel 41 (72.92 MHz), position the left rotary switch to point to 4 (X10), and position the right rotary switch to point to 1 (X1). Refer to frequency charts on pages 9 and 10 for selectable frequencies. Multiple Channel Operation When multiple transmitters are broadcasting in the same immediate area (within 100 feet), the RF signals will “mix” together generating additional signals. If these product frequencies are too close to a frequency which you are using, you will experience intermodulation interference. This condition is common to all radio receivers to some extent. Simultaneous operation of more than three channels requires frequency coordination to avoid intermodulation interference which could result in poor or unusable performance. To avoid this type of interference, you should select frequencies from one of the standard groups (see group frequency charts on pages 9 and 10), or use COMTEK’s frequency selection software available at www.comtek.com to determine appropriate frequencies or contact COMTEK to obtain a free copy. Page 8 M-175 FREQUENCY INFORMATION 72-76 MHz STANDARD COMPANDED CHANNELS CHAN 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 FREQ 72.02 MHz 72.04 MHz 72.06 MHz 72.08 MHz 72.10 MHz 72.12 MHz 72.14 MHz 72.16 MHz 72.18 MHz 72.20 MHz 72.22 MHz 72.24 MHz 72.26 MHz 72.28 MHz 72.30 MHz 72.32 MHz 72.34 MHz 72.36 MHz 72.38 MHz 72.40 MHz 72.42 MHz 72.46 MHz 72.50 MHz 72.54 MHz 72.58 MHz 72.62 MHz 72.64 MHz 72.66 MHz 72.68 MHz 72.70 MHz 72.72 MHz 72.74 MHz 72.76 MHz 72.78 MHz CHAN FREQ 35 72.80 MHz 36 72.82 MHz 37 72.84 MHz 38 72.86 MHz 39 72.88 MHz 40 72.90 MHz 41 72.92 MHz 42 72.94 MHz 43 72.96 MHz 44 72.98 MHz 45 74.61 MHz 46 74.63 MHz 47 74.65 MHz 48 74.67 MHz 49 74.69 MHz 50 74.71 MHz 51 74.73 MHz 52 74.75 MHz 53 74.77 MHz 54 74.79 MHz 55 75.21 MHz 56 75.23 MHz 57 75.25 MHz 58 75.27 MHz 59 75.29 MHz 60 75.31 MHz 61 75.33 MHz 62 75.35 MHz 63 75.37 MHz 64 75.39 MHz 65 75.42MHz 66 75.46 MHz 67 75.50 MHz 68 75.54 MHz GROUP 1 CHAN FREQ CHAN 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 75.58 MHz 75.62 MHz 75.64 MHz 75.66 MHz 75.68 MHz 75.70 MHz 75.72 MHz 75.74 MHz 75.76 MHz 75.78 MHz 75.80 MHz 75.82 MHz 75.84 MHz 75.86 MHz 75.88 MHz 75.90 MHz 75.92 MHz 75.94 MHz 75.96 MHz 75.98 MHz 01 11 31 45 70 75 05 15 23 30 40 67 74 84 50 60 FREQENCY 72.1 MHz 72.3 MHz 72.5 MHz 72.7 MHz 72.9 MHz 75.5 MHz 75.7 MHz 75.9 MHz 74.7 MHz 75.3 MHz 04 09 31 53 69 85 FREQ 72.08 72.18 72.72 74.77 75.58 75.92 MHz MHz MHz MHz MHz MHz GROUP 3 CHAN CHAN Transmitter Proximities For Multiple Channel Operation 13 25 54 57 81 87 FREQ 72.26 72.58 74.79 75.25 75.84 75.96 MHz MHz MHz MHz MHz MHz Group 1 operating area transmitters Frequency groups being transmitted should Group 2 be separated by 2X the operating area; operating area and for best performance, the group operating areas should have a 100 ft. minimum separation. Transmitter separation Group 3 operating area transmitters transmitters Transmitter separation Page 9 MHz MHz MHz MHz MHz MHz GROUP 2 CHAN Recommended Channels For Non-Companded Receivers CHAN FREQ 72.02 72.22 72.72 74.61 75.62 75.72 M-175 OPTIONAL ACCESSORIES Optional Accessories 1. NBC 9-2C Battery charger 2. NBC 9-3-1 Digital fast charger 3. NBC 9-3-12 Digital 12-station fast charger 4. NH9-200 Rechargeable batteries 5. BC-216 Snap-on belt clip (supplied with M-175) 6. P1 Universal pouch 7. SM-185 Unidirectional electret condenser microphone 8. PSC-HM Headworn unidirectional electret microphone Auxiliary Audio Input Cords 9. CB-36 STM Stereo mini 3.5mm (supplied with M-175) 10. CB-36 RCA Phono plug (optional) 11. CB-36 ST1/4 Stereo 1/4” (optional) 12. CB-36 XLR XLR-F 3 pin connector (optional) Page 10 M-175 SPECIFICATIONS Audio Input: • Microphone input impedance for electret type microphone - 3000 ohm • Aux/Line input impedance - 10 k ohm (0 dBV nominal) Connectors: Microphone - Micro-mini mono 2.5mm Auxiliary - TRS 3.5mm jack Audio: Tip and sleeve Battery Charging: Tip and sleeve Out-of-Band Emissions: Better than 50 dB below carrier R.F. Stability: 20 ppm XTL controlled Digitally synthesized RF Power Output: 40 mW to antenna system FCC Compliance: Type Accepted under FCC Part 90 Controls and Indicators: • Synthesized channel selection switches • Power On/Off switch • Optional microphone switch • Audio input gain control • Power/Battery status indicator • Audio (voice level) modulation indicator • Manual compand switch Frequency Response: 100 Hz to 10 kHz Audio Distortion: Less than 1% at 50% modulation Modulation Limiter: Soft compressor with 30 dB linear overload protection; attack time - less than 1 ms, recovery time - 10 ms Antenna System: Body induction microphone cord antenna. Current Drain: 29 mA constant current Battery: • 9 volt alkaline Eveready 522 or equivalent for up to 16 hours of use • Rechargeable 9 volt Ni-MH 200 mAh battery for up to 5 hours of operation • Rechargeable 9 volt Lithium Polymer 500 mAh battery for up to 16 hours of use Dimensions: 1 1/16" x 2 1/4" x 3 1/2" (27 mm x 57 mm x 89 mm) Frequency Modulation: 7.5 kHz deviation (companded) 5.0 kHz deviation (non-companded) Operating Radio Frequency: ity: 88 synthesized channels in the 72-76 MHz band. Weight: 5 ounces (140 grams) NOTE: Specifications subject to change without notice or obligation Page 11 M-175 WARRANTY AND SERVICE 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 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 M-175 transmitter. Before returning the M-175 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. Page 12
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