User's Manual

Weehawken Tunnel VHF Repeater System
User/Maintenance Handbook
Handbook N.-Weehawken_VHF Issue No:-A Date:-05/08/05
Page:-
60 of 75
7.11.2 Programming Procedure
Check that the required frequency falls within the operational frequency limits of the Cell
Enhancer.
For each channel required, subtract the synthesiser offset from the required operating
frequency and record the resulting local oscillator frequency.
Divide each local oscillator frequency by the channel spacing and check that the result is an
integer (i.e: no remainder).
If the synthesiser division ratio is not an integer value, check the required operational
frequency and repeat the calculation checking for mistakes.
Convert the required local oscillator frequency to synthesiser programming switch state
patterns according to the following table.
7.11.3 12.5kHz step size switch functions
Switch
Number
Synthesiser offset added when switch in UP
position
1 +12.5kHz
2 +25kHz
3 +50kHz
4 +100kHz
5 +200kHz
6 +400kHz
7 +800kHz
8 +1.6MHz
9 +3.2MHz
10 +6.4MHz
11 +12.8MHz
12 +25.6MHz
13 +51.2MHz
14 +102.4MHz
15 +204.8MHz
16 +409.6MHz