GTR 8000 Base Radio
5.8.1.3.1 Tuning The VHF Preselector
Procedure Steps
1
Turn the base radio/receiver power supply ON (to provide a 50 Ohm termination).
2
Adjust the signal generator to the frequency calculated in
5.8.1.1.1 Calculating The VHF Alignment Frequency
For a Single Receive Frequency, page 5-5
or
5.8.1.1.2 Calculating The VHF Alignment Frequency for Multi
. Set the level to +5 dBm.
3
Insert tuning probe into cavity H1 and adjust tuning screw 1 for a
PEAK
.
4
Leave tuning probe in cavity H1 and adjust tuning screw 2 for a
DIP
.
5
Insert tuning probe into cavity H2 and adjust tuning screw 3 for a
DIP
.
6
Insert tuning probe into cavity H3 and adjust tuning screw 4 for a
DIP
.
7
Insert tuning probe into cavity H4. Decrease output from signal generator to –5 dBm.
8
Adjust tuning screw 5 for a
DIP
. Then turn tuning screw 5 an additional 1/4 turn counterclockwise. (Note that
DIP
will not be as sharp for screw 5 as it was for screws 2 through 4.)
5.8.2 UHF Tuning Procedures
5.8.2.1 Calculating Proper UHF Alignment Frequency
Use either
5.8.2.1.1 Calculating The UHF Alignment Frequency For a Single Receive Frequency, page 5-8
or
5.8.2.1.2 Calculating The UHF Alignment Frequency For Multi Receive Frequencies, page 5-9
to calculate the
alignment frequency to be generated by the signal generator.
5.8.2.1.1 Calculating The UHF 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:
5-8
6871022P86-A - November 2012
Summary of Contents for GTR 8000
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