GTR 8000 Base Radio
Procedure Steps
1
From the site documentation or the CSS, note the receive frequency for each channel supported by the base
radio/receiver.
2
Calculate a midpoint frequency as follows:
F
mid
= (F
highest
+ F
lowest
) ÷ 2
3
Using F
mid
in place of the base radio/receiver receive frequency, perform steps 3 and 4 from
Calculating The VHF Alignment Frequency For a Single Receive Frequency, page 5-5
5.8.1.2 Preparing The Equipment For VHF Alignment
Procedure Steps
1
Make sure the base radio/receiver (with preselector assembly) is installed in a functional station cage equipped
with a power supply module.
2
Detune the preselector as follows:
a. If the alignment frequency (calculated in
5.8.1.1.1 Calculating The VHF Alignment Frequency For a Single
or
5.8.1.1.2 Calculating The VHF Alignment Frequency for Multi Receive
) is greater than 148 MHz (Range 1) or 156 MHz (Range 2), turn the five tuning
screws clockwise until 1/8" protrudes past each of the tension nuts.
b. If the alignment frequency is less than or equal to 148 MHz (Range 1) or 156 MHz (Range 2), turn the five
tuning screws counterclockwise until 3/4" protrudes past each of the tension nuts.
3
Using the torque driver and deep well socket, tighten the five tension nuts on the adjustment screws to 6 in-lbs.
4
See
.
5.8.1.3 VHF Tuning Procedure
See
for the location of the tuning screws and cavity probe holes.
When tuning for peak or dip, turn the tuning screw 1/2 turn past the peak or dip to verify that you have
obtained a true peak or dip. After ensuring you have found true peak or dip, turn the screw back to the
location of the original peak or dip.
5-6
6871022P86-A - November 2012
Summary of Contents for GTR 8000
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