6-101
SECTION 6
OPTIONS
6-15-4 BASE FREQUENCIES
Every network has a channel plan, identifying a channel number with a specific transmit
and receive frequency. Generally this plan is referenced back to an initial BASE
frequency which is either logical channel 0 or occasionally logical channel 1. Each
channel is then related to the channel number and base frequency by the formula BASE
FREQUENCY + (channel number x channel spacing).
For example if it is known that the frequency of a control channel is 188.8750 MHz and
it is channel number 298, the base frequency must be 188.8750 – (298 x 0.0125) =
185.025 MHz assuming the channel spacing is 12.5kHz.
For situations with a non incremental channel plan, usually used when there are
different channel spacings (Rx/Tx split) on different channels, it is possible to define
each channel number manually by setting the channel spacing to zero.
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