Page 9
Frequency Selection
The BST-75 transmitter comes from the factory on 10 standard
manually selectable channels. Other group frequencies are available
from the 88 “Flash Memory” programmable channel list and have been
coordinated for simultaneous operation. These group frequencies
can be programmed for use with the manual 10-channel selectable
user-switch. Frequency coordination and after-sale programming for
different compatible frequency groups can be done through COMTEK’s
Technical Support Services. Frequency selection software may be
downloaded from COMTEK’s website at www.comtek/software.html
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.)
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.
BST-75 FREQUENCY INFORMATION
transmitters
transmitters
transmitters
Group 1
operating area
Group 2
operating area
Group 3
operating area
Transmitter
separation
Transmitter
separation
