User's Manual

9-38 68P81093C75-A
VHF Tuning Procedure
Calculating Proper
Alignment Frequency
Use one of the following two methods to calculate the alignment
frequency to be generated by the signal generator.
For stations with a single receive frequency, calculate the frequency
of the alignment signal as follows:
Step 1. From the site documentation or the RSS, determine
the station receive frequency.
Step 2. If the frequency is ≤ 148 MHz (Range 1) or ≤ 156
MHz (Range 2), subtract 250 kHz. Otherwise, note the
actual frequency.
Example: If the station receive frequency is 134.575
MHz (Range 2), subtract 250 kHz, since the frequency
is less than 143 MHz.
134.575 MHz - 250 MHz = 134.325 MHz
Step 3. If Receiver Module is Range 1, determine the
alignment frequency as follows:
If the frequency (from Step 2) is < 134 MHz, then the
alignment frequency = 133.75 MHz.
If the frequency (from Step 2) is > 152 MHz, then the
alignment frequency = 152 MHz.
Otherwise, use the actual frequency from Step 2.
Step 4. If the Receiver Module is Range 2, determine the
alignment frequency as follows:
If the frequency (from Step 2) is < 152 MHz, then the
alignment frequency = 151.75 MHz.
If the frequency (from Step 2) is > 172 MHz, then the
alignment frequency = 172 MHz.
Otherwise, use the actual frequency from Step 2.
For stations with multiple receive frequencies, calculate the
frequencies of the alignment signal as follows:
Step 1. From the site documentation, or the RSS, note the
receive frequency for each channel supported by the
station.