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Summary of Contents for Comtek M-175
- Page 1 M-175 OPERATOR’S MANUAL 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...
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Page 2: Table Of Contents
Auxiliary Audio Input Operation ........Snap-On Belt Clip ..........Frequency Selection ..........Frequency Information .......... 9-10 P-7 Option .............. Optional Accessories ..........Trouble Shooting ............. 13-14 Specifications ............Warranty and Service ..........® © 2012 COMTEK All rights reserved. Printed in the U.S.A. 01-16-12... -
Page 3: Introduction
Comtek full fidelity receivers, or non-companded 1:1 audio processing on prescribed channels with Comtek and other lower cost popular receivers. Both audio processing systems have the same frequency response of 80 Hz to 10 KHz. Operating under F.C.C. Regulation Part 90, the M-175 transmitter has greater transmission range and reliability. -
Page 4: Setup
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. -
Page 5: Controls
M-175 CONTROLS 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.) BATTERY COMPARTMENT: The battery compartment features a hinged battery cover and an alignment system that ensures proper battery polarity. -
Page 6: Battery Removal / Replacement
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. -
Page 7: Battery Charging
(Alkaline batteries must not be charged.) 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. -
Page 8: Auxiliary Audio Input Operation
M-175 AUXILIARY AUDIO INPUT OPERATION Auxiliary Audio Input Operation The M-175 transmitter may transmit from a variety of audio sources such as digital media players, or any audio device having an auxiliary or earphone level audio signal. 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... -
Page 9: Snap-On Belt Clip
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... -
Page 10: Frequency Selection
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 both standard non-companded channels and high-fidelity companded channels. Channels 1-88 are to be used only with receivers having 2:1 audio companding processing. -
Page 11: Frequency Information
M-175 FREQUENCY INFORMATION 72-76 MHz STANDARD COMPANDED CHANNELS GROUP 1 CHAN FREQ CHAN FREQ CHAN FREQ CHAN FREQ 72.02 MHz 72.02 MHz 72.80 MHz 75.58 MHz 72.22 MHz 72.04 MHz 72.82 MHz 75.62 MHz 72.72 MHz 72.06 MHz 72.84 MHz 75.64 MHz... -
Page 12: Frequency Information
In order to accommodate a greater variety of receivers, the M-175 transmitter incorporates the option to operate with receivers that have companded or non-companded audio processing. However, the M-175 transmitter must operate non-companded with non-companded receivers and companded only with receivers that incorporate companding processing. -
Page 13: P-7 Option
Two separate antennas must be used to cover the two operating frequency ranges of 72-73 MHz (antenna #1) and 74 to 76 MHz (antenna #2). Both antennas are supplied with the M-175 Option P-7 transmitter. Page 11... -
Page 14: Optional Accessories
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... -
Page 15: Trouble Shooting
• The M-175 transmitter must be returned to COMTEK for service if the test indicator lamp does not illuminate when new alkaline batteries are used. - Page 16 2. Channel Selection For operation with non-companded receivers (such as PR-75 or PR-72), the M-175 transmitter must be set to one of 10 non-companded channels 91-00. For high-fidelity operation, the companded channels 1-88 must be used with companded receiver PR-216/72MHz model.
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Page 17: Specifications
M-175 SPECIFICATIONS Audio Input: Out-of-Band Emissions: • Microphone input impedance for electret Better than 50 dB below carrier type microphone - 3000 ohm • Aux/Line input impedance - 10 k ohm at R.F. Stability: 0 dBV nominal 20 ppm XTL controlled... -
Page 18: Warranty And Service
COMTEK will pay for insurance and ground return shipping costs in the United States for all warranty service. 357 West 2700 South • Salt Lake City, Utah 84115 • Phone: (800) 496-3463 • Fax: (801) 484-6906 • www.comtek.com E-mail: sales@comtek.com... - Page 19 357 West 2700 South • Salt Lake City, Utah 84115 • Phone: (800) 496-3463 • Fax: (801) 484-6906 • http://www.comtek.com...
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