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SECTION 6
OPTIONS
6-15-4 BASE FREQUENCIES
Ever y networ k has a channel plan, identifying a channel number with a specific tr ansmit
and r eceive fr equency.
G ener ally this plan is r efer enced back to an initial BASE
fr equency which is either logical channel 0 or occasionally logical channel 1.
Each
channel is then r elated to the channel number and base fr equency by the for mula BASE
FREQ UENCY + ( channel number x channel spacing) .
For example if it is known that the fr equency of a contr ol channel is 188.8750 MHz and
it is channel number 298, the base fr equency must be 188.8750 – ( 298 x 0.0125) =
185.025 MHz assuming the channel spacing is 12.5kHz.
For situations with a non incr emental channel plan, usually used when ther e ar e
differ ent channel spacings
( Rx/Tx split) on differ ent channels, it is possible to define
each channel number manually by setting the channel spacing to zer o.
6- 101
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