User's Manual

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 98 “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.
Multiple Channel Operation
When multiple transmitters (more than two) are used in the same
proximity, intermodulation interference often occurs. 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 to which the receiver can also respond, you
will experience intermodulation interference which may cause
undesirable operation.
To avoid this type of self-interference when multiple transmitters
are used in the same proximity, transmitting frequencies must be
coordinated by selecting from frequencies in the same group.
FREQUENCY
72.020 MHz
72.220 MHz
72.720 MHz
74.610 MHz
75.620 MHz
75.720 MHz
FREQUENCY
72.080 MHz
72.180 MHz
72.720 MHz
74.770 MHz
75.580 MHz
75.920 MHz
FREQUENCY
72.260 MHz
72.580 MHz
72.790 MHz
74.250 MHz
75.840 MHz
75.960 MHz
GROUP 1 GROUP 2 GROUP 3
BST-75 FREQUENCY INFORMATION