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.
TABLE OF CONTENTS Introduction ........................................................... 1 Setup ............................................................................... 2 Controls .................................................................. 3 Battery Removal / Replacement ...................................... 4 Battery Charging ...................................................... 5 Auxiliary Audio Input Operation ................................... 6-7 Snap-On Belt Clip .....
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 communication, and for other personal remote transmission situations.
M-216 SETUP Setup a. Check to ensure that the M-216 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 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 30 hours of operation.
M-216 CONTROLS n OPTIONAL COMPAND AUTO / OFF SWITCH: This switch overrides the automatic selection of the companded channels for non-companded operation. (This switch should remain in the “Auto” position.) o CHANNEL SWITCHES: These rotary switches are set to the same channel as the receiver. Actual frequency of operation must agree with the receiver. (See page 10 for frequency selection chart.
M-216 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 turned on, the LED illuminates. If the battery is low the green LED will blink rapidly warning 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 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-216 is turned OFF. 3. Note that the red charging indicator on the charger is ON when the M-216 is plugged into the charger through the auxiliary audio input 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.
M-216 AUXILIARY AUDIO INPUT OPERATION Auxiliary Audio Input Operation The M-216 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-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 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.
M-216 FREQUENCY SELECTION Frequency Selection (216-217 MHz) The M-216 transmitter can operate on one of 57 available frequencies between 216 MHz and 217 MHz. COMTEK’s channel designations indicate both non-companded standard channels and high-fidelity, companded channels. Channels 1-40 are non-companded channels offering compatibility with other manufacturers’ receivers. Channels 41-60 are high-fidelity, companded channels for use with COMTEK receivers.
M-216 FREQUENCY INFORMATION Non-Companded Channels High-Fidelity Companded Channels For use with COMTEK and other manufacturers (Educational Standard) For use with COMTEK equipment only (Companded) CHANNEL FREQUENCY CHANNEL 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 FREQUENCY (SWITCH POSITION) (SWITCH POSITION) 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.
M-216 M-216 216 MHz NON-COMPANDED FREQUENCY GROUPS 216 MHz COMPANDED FREQUENCY GROUPS Compatible with COMTEK and other manufacturers For COMTEK equipment only GROUP 1 GROUP A CHANNEL FREQUENCY CHANNEL FREQUENCY 1 9 15 24 31 36 216.0125 MHz 216.2125 MHz 216.3625 MHz 216.5875 MHz 216.7625 MHz 216.8875 MHz 41 44 51 55 60 216.0250 MHz 216.1750 MHz 216.5250 MHz 216.7250 MHz 216.9750 MHz GROUP B GROUP 2 CHANNEL FREQUENCY CHANNEL FREQUENCY 4 10 14 32 35 40 216.0875 MHz 216.2375 MHz 216.
M-216 OPTIONAL ACCESSORIES Optional Accessories 1. NBC 9-2C Battery charger 2. NH 9-200 Rechargeable batteries 3. P-1 Universal pouch 4. BC-216 Snap-on belt clip (supplied with M-216) 5. LW-216 Whip antenna (supplied with M-216) 6. HM-100C Headworn unidirectional electret microphone 7. HH-185 Handheld microphone boom adaptor 8. TM-10 Conference table microphone adaptor 9. SM-185RT Unidirectional electret condenser microphone Auxiliary Audio Input Cords 10. CB-36 ST Stereo mini 3.
M-216 OPTIONS SLW-216 short whip antenna (supplied) Option P-7 The optional P-7 M-216 transmitter may be body worn on a belt with the snap-on belt clip or may be inserted in the optional MBS-216 mounting bracket stand for easy system setup. The MBS-216 is ideal for on location program monitoring for large area coverage.
M-216 / HH-185 Optional HH-185 Handheld Boom Microphone For added versatility, the HH-185 cardioid boom microphone allows the standard M-216 transmitter to be used as a handheld “pass-around” wireless microphone. The HH-185 microphone gain is adjusted with the gain control on the M-216 transmitter. This allows the user to optimize the sensitivity of the microphone when it is used in a high background noise environment.
M-216 TROUBLE SHOOTING Batteries and Battery Charging If... Test indicator lamp doesn’t illuminate when units are turned on... Then... • If rechargeable batteries are used, ensure that they have been allowed to charge at least 14 hours to a full charge. Verify that the charging indicator lamps are illuminated when the charging plugs are plugged into the units. The units’ power switches must be in the “off ” position for charging.
M-216 TROUBLE SHOOTING (Continued) Possible Causes of Noisy Audio 1. Excessive Distances Operating at a distances greater then 200 ft. may cause excessive noise. 2. Channel Selection Operating on non-companded channels 1-40 will inherently have much noisier characteristics. Companded channels 41-60 will produce the best signal-to-noise performance. 3. Gain Problem Check the microphone gain setting on the M-216 transmitter for normal operation with the “voice” modulation indicator (See page 2 section d.
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 2.5 mm Auxiliary - Mini stereo 3.5 mm Audio: Tip and sleeve Battery Charging: + Tip, _ sleeve 9 volt DC input: + Ring, _ sleeve (with current limiting) Out-of-Band Emissions: Better than 45 dB below carrier R.F.
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.