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UBCD396XT
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41. Calculating upper base frequencies
Custom Band Plans (800 Custom, VHF, UHF) require that you enter both a lower
and an upper base frequency value. Here's how to determine these values.
The Lower Base Frequency (or Base ) is always the base frequency as provided in
the RRDB. The Upper Base Frequency is calculated from the following formulas:
For sites with a single band plan:
Where:
Base = the lower base frequency listed in RRDB.
Offset = the offset for this entry.
Step = the step for this entry.
For sites with multiple band plans:
Where:
Basen is the lower base frequency for the entry.
Offset
n+1 is the Offset for the next band plan (for the last table, use 760)
Offset
n is the offset for this band plan
Step
n is the step for this band.
For example:
Custom Frequency Table
Entry Base Spacing Offset
A 155.4150 15.0 380
B 157.2000 12.5 436
C 157.4700 15.0 454
Base + ( (759 – Offset ) × Step )
Upper Basen = Basen + ( Offsetn+1 – 1 – Offsetn ) × Stepn