Comtek Communications Technology Inc M216 Manual De Usuario

Page 3

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.  Channels 41-60 are high fidelity wide-band companded

channels (10 kHz deviation) for use with COMTEK transmitters.  COMTEK

transmitters automatically transmit the proper modulation when set to

channels 1-40 for narrow-band or 41-60 for wide-band companded channels.

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 (216.0250 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.

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 frequency group charts on page 10), or use COMTEK’s

frequency selection software (www.comtek.com/software.htm) to determine

appropriate frequencies or contact COMTEK to obtain a free copy.