Preparing The Equipment For Uhf Alignment; Uhf Tuning Procedure - Motorola GTR 8000 Manual

GTR 8000 Base Radio
Procedure Steps
From the site documentation or the CSS, note the receive frequency for each channel supported by the base
1
radio/receiver.
2 Calculate a midpoint frequency as follows:
F = (F
mid highest
3 Using F
mid
The UHF Alignment Frequency For a Single Receive Frequency, page

5.8.2.2 Preparing The Equipment For UHF Alignment

Procedure Steps
1 Make sure base radio/receiver (with preselector assembly) is installed in a functional station cage equipped
with a power supply module.
2 Using the torque driver and deep well socket, loosen the three tension nuts on the adjustment screws.
3 Detune the preselector by turning tuning screws 3 and 4 clockwise until they bottom out. Be careful not to apply
more than 3 in-lbs of torque to prevent warping preselector cover and housing.
4 See Figure

5.8.2.3 UHF Tuning Procedure

See Figure 5-2 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.
5-10
+ F ) ÷ 2
lowest
in place of the base radio receive frequency, perform steps 1 through 4 from
5-2.
5.8.2.1.1 Calculating
5-8.
6871022P86-A - November 2012