Vhf Tuning Procedures; Calculating Proper Vhf Alignment Frequency; Calculating The Vhf Alignment Frequency For A Single Receive Frequency; Calculating The Vhf Alignment Frequency For Multi Receive Frequencies - Motorola GTR 8000 Manual

5.8.1 VHF Tuning Procedures

5.8.1.1 Calculating Proper VHF Alignment Frequency

Use either 5.8.1.1.1 Calculating The VHF Alignment Frequency For a Single Receive Frequency, page 5-5
5.8.1.1.2 Calculating The VHF Alignment Frequency for Multi Receive Frequencies, page 5-5
alignment frequency to be generated by the signal generator.
5.8.1.1.1 Calculating The VHF Alignment Frequency For a Single Receive
Frequency
When and where to use:
For base radios with a single receive frequency, calculate the frequency of the alignment signal as follows:
Procedure Steps
1 From the site documentation or the CSS, determine the base radio receive frequency.
If the frequency is ≤148 MHz or ≥156 MHz, subtract 250 kHz. Otherwise, note the actual frequency.
2
Step example: If the base radio receive frequency is 138.575 MHz, subtract 250 kHz because the frequency is
less than 148 MHz: 138.575 MHz – 250 kHz =138.325 MHz
If the preselector is Range 1 (136–154 MHz), determine the alignment frequency as follows:
3
If frequency (from Step 2) is > 152 MHz, then alignment frequency = 152 MHz.
Otherwise, use actual frequency from Step 2.
4 If the preselector is Range 2 (150–174 MHz), determine the alignment frequency as follows:
If the frequency (from Step 2) is < 152 MHz, then alignment frequency = 151 .75 MHz.
If frequency (from Step 2) is > 172 MHz, then alignment frequency =172 MHz.
Otherwise, use actual frequency from Step 2.
5.8.1.1.2 Calculating The VHF Alignment Frequency for Multi Receive
Frequencies
When and where to use:
For base radios/receivers with multiple receive frequencies, calculate the frequency of the alignment signal
as follows:
6871022P86-A - November 2012
5.8.1 VHF Tuning Procedures
or
to calculate the VHF
5-5