Comtek PR-75a Operator's Manual download pdf (Page 9)

Page 7

Multiple Channel Operation

When multiple transmitters (more than two) are used in the same proximity,

intermodulation interference can occur. This condition is common to all

radio receivers to some extent when multiple transmitters are used in the

same operating area. The RF signals will “MIX” together generating

additional signals. If these product frequencies are too close to a frequency

which the receiver can also respond to, you will experience intermodulation

interference which may cause undesirable operation.

To avoid this type of interference when multiple transmitters are used in the

same proximity, transmitting frequencies must be coordinated by selecting

from frequencies in the same group. (See group frequency chart on page 6.)

When programming new customized frequency groups with the FP-75

channel programmer, COMTEK’s Frequency Selection Guide Software can

be used to determine appropriate frequencies. Contact COMTEK to obtain a

free copy of the frequency selection software or download it from COMTEK’s

web site at www.comtek.com/software.html

transmitterstransmitters

transmitters

Group 1

operating area

Group 2

operating area

Group 3

operating area

Transmitter

separation

Transmitter

separation

Transmitter Proximities

For Multiple Channel

Operation

Frequency groups being transmitted

should be separated by 2X

the operating area; and for

best performance, the

group operating areas

should have a 100 ft.

minimum separation.

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Comtek PR-75a Operator's Manual Page 9