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.
Use this spreadsheet to calculate the values for you: CustomBandPlanCalculator.xls
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:
Base + ( (759 – Offset ) x Step ) |
Where:
Upper Base_{n} = Base_{n} + ( Offset_{n+1} – 1 – Offset_{n} ) x Step_{n} |
Where:
Entry | Base | Spacing | Offset |
---|---|---|---|
A | 155.4150 | 15.0 | 380 |
B | 157.2000 | 12.5 | 436 |
C | 157.4700 | 15.0 | 454 |
Plugging these values into our formula, we get:
For entry A: | |||||
Upper Base_{A} | = | Base_{A} + | ( Offset_{B} – 1 | – Offset_{A} ) | x Step_{A} |
Upper Base_{A} | = | 155.415 MHz + | (436 – 1 | – 380) | x 15kHz |
Upper Base_{A} | = | 155.415 MHz + | 55 | x 0.015 MHz | |
Upper Base_{A} | = | 155.415 MHz + | 0.825 MHz | ||
Upper Base_{A} | = | 156.240 MHz |
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For entry B: | |||||
Upper Base_{B} | = | Base_{B} + | ( Offset_{C} – 1 | – Offset_{B} ) | x Step_{B} |
Upper Base_{B} | = | 157.200 MHz + | (454 – 1 | – 436) | x 12.5 kHz |
Upper Base_{B} | = | 157.200 MHz + | 17 | x 0.0125 MHz | |
Upper Base_{B} | = | 157.200 MHz + | 0.2125 MHz | ||
Upper Base_{B} | = | 157.4125 MHz |
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For entry C: | |||||
Upper Base_{C} | = | Base_{C} + | ( Offset_{C+1} – 1 | – Offset_{C} ) | x Step_{C} |
Upper Base_{C} | = | 157.470 MHz + | (760 – 1 | – 454) | x 15 kHz |
Upper Base_{C} | = | 157.470 MHz + | 305 | x 0.015 MHz | |
Upper Base_{C} | = | 157.470 MHz + | 4.575 MHz | ||
Upper Base_{C} | = | 162.045 MHz |
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This page applies to the following scanner(s): BCD996XT BCT15X BCD396XT BC346XT BC346XTC Users Guide |