COMTEK M-216 - Manual (Page 10)

Page 8
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. COMTEK transmitters
automatically transmit the proper mode when set to channels 1-40 for
non-companded or 41-60 for companded channels.
Note: The optional compand switch should remain in
the “Auto” position.
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, e.g. 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.
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 frequency group charts on page 10), or use COMTEK’s
frequency selection software (www.comtek.com/support.html) to determine
appropriate frequencies or contact COMTEK to obtain a free copy.
M-216 FREQUENCY SELECTION
Compand switch
(optional)