M-216 OPERATOR’S MANUAL M-216 Wireless Microphone Transmitter 357 West 2700 South • Salt Lake City, Utah 84115 • Phone: (800) 496-3463 • Fax: (801) 484-6906 • http://www.comtek.
INTRODUCTION M-216 Wireless Microphone Transmitter T he M-216 wireless microphone transmitter offers the ultimate performance and versatility for assistive listening, language interpretation, tour guide presentations, personal cueing, and for other personal remote transmission situations. The M-216 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 wireless microphone.
M-216 OPERATING INSTRUCTIONS Setup a. Check to insure that the M-216 transmitter’s radio frequency channel is the same as the associated COMTEK receiver’s channel. (Channels are indicated by the 99 position rotary channel selector switches on the back of the transmitter: see page 3.) 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 40 hours of operation.
M-216 OPERATING INSTRUCTIONS Frequency Selection (216-217 MHz) The M-216 transmitter can operate on one of 57 available channels between 216 MHz and 217 MHz. COMTEK’s channel designations indicate both standard narrow-band channels and high fidelity wide-band companded channels. Channels 1-40 are narrow-band channels (5 kHz deviation) offering compatibility with other manufacturers’ receivers such as the Phonak MicroEar.
M-216 OPERATING INSTRUCTIONS 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 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.
M-216 OPERATING INSTRUCTIONS Auxiliary Audio Input Operation The M-216 transmitter may transmit from 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-216 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.
M-216 OPERATING INSTRUCTIONS 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.
M-216 OPERATING INSTRUCTIONS Battery Charge To charge the M-216 with the NBC 9-2C charger: TANT IMPOR 1. Make sure that a Ni-MH rechargeable battery is used. (Alkaline batteries must not be charged with the NBC 9-2C charger.) 2. Make sure the M-216 is turned OFF. 3. Note that the red charging indicator on the NBC 9-2C should turn on when the charger output cord is plugged into the microphone input receptacle on the transmitter. 4.
M-216 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 set to the same channel as the transmitter. Actual frequency of operation must agree with the transmitter. (See page 10 for frequency selection chart.) p BATTERY COMPARTMENT: The battery compartment features a hinged battery cover and an alignment system that insures proper battery polarity.
M-216 FREQUENCY CHART CHANNEL FREQUENCY NARROW-BAND CHANNELS For use with COMTEK PR-216 Receiver or with Phonak microEar 5 kHz DEVIATION CHANNEL FREQUENCY 31 216.7625 MHz 32 216.7875 MHz 1 216.0125 MHz 33 216.8125 MHz 2 216.0375 MHz 34 216.8375 MHz 3 216.0625 MHz 35 216.8625 MHz 4 216.0875 MHz 36 216.8875 MHz 5 216.1125 MHz 37 216.9125 MHz 6 216.1375 MHz 38 216.9375 MHz 7 216.1625 MHz 39 216.9625 MHz 8 216.1875 MHz 40 216.
M-216 M-216 216 MHz NARROW-BAND FREQUENCY GROUPS 216 MHz WIDE-BAND FREQUENCY GROUPS For use with COMTEK PR-216 receiver or with Phonak microEar 5 kHz deviation For COMTEK PR-216 10 kHz deviation GROUP A GROUP 1 CHANNEL FREQUENCY CHANNEL FREQUENCY 1 8 12 26 34 216.0125 MHz 216.1875 MHz 216.2875 MHz 216.6375 MHz 216.8375 MHz 41 44 46 53 57 216.0250 MHz 216.1750 MHz 216.2750 MHz 216.6250 MHz 216.8250 MHz GROUP B GROUP 2 CHANNEL FREQUENCY CHANNEL FREQUENCY 4 10 14 28 36 216.0875 MHz 216.
M-216 OPTIONAL ACCESSORIES Optional Accessories 1. NBC 9-2C Battery charger 2. NH9-150 Rechargeable batteries 3. P1 Universal pouch 4. BC-216 Snap-on belt clip (supplied with M-216) 5. LW-216 Whip antenna (supplied with M-216) 6. PSC-HM Head worn unidirectional electret microphone 7. SM-185 Unidirectional electret condenser microphone Auxiliary Audio Input Cords 8. CB-36 STM Stereo mini 3.5mm (supplied with M-216) 9. CB-36 RCA Phono plug (optional) 10. CB-36 ST1/4 Stereo 1/4” (optional) 11.
M-216 SPECIFICATIONS Audio Input: • Microphone input impedance for electret type microphone - 3000 ohm • Aux/Line input impedance - 10 k ohm at 0 dB nominal Connectors: Microphone - Micro-mini mono 2.5mm Auxiliary - Mini stereo 3.
M-216 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.
357 West 2700 South • Salt Lake City, Utah 84115 • Phone: (800) 496-3463 • Fax: (801) 484-6906 • http://www.comtek.