Motorola MTR2000 T5544 Instruction / Field Service Manual page 152

Troubleshooting
Note
38
Tuning Procedure
1. Apply ac power to the station power supply (to provide an active
50 Ω termination).
2. Adjust the signal generator to the frequency calculated in the previ-
ous steps. Set the level to +5 dBm.
When tuning for a peak or dip, turn the tuning screw a 1/2 turn past the
peak or dip to ensure that tuning is to a true peak or dip. Return the screw
to the location of the peak or dip after verifying that it is a true peak or dip.
3. Insert tuning probe into cavity H1 (refer to Figure 9) and adjust tun-
ing screw 1 for a PEAK.
4. Tighten tension nut on tuning screw 1 to at least 1.36Nm (12 in-lb)
and fine tune tuning screw 1 for a PEAK.
5. Keep tuning probe in cavity H1 and adjust tuning screw 2 for a DIP.
6. Tighten tension nut on tuning screw 2 to at least 1.36Nm (12 in-lb)
and fine tune tuning screw 2 for a DIP.
7. Insert tuning probe into cavity H2 and adjust tuning screw 3 for a
DIP.
8. Tighten tension nut on tuning screw 3 to at least 1.36Nm (12 in-lb)
and fine tune tuning screw 3 for a DIP.
9. Insert tuning probe into cavity H3 and adjust tuning screw 4 for a
DIP.
10. Tighten tension nut on tuning screw 4 to at least 1.36Nm (12 in-lb)
and fine tune tuning screw 4 for a DIP.
11. Insert tuning probe into cavity H4. Decrease output from signal gen-
erator to –5 dBm.
12. Adjust tuning screw 5 for a DIP.
13. Tighten tension nut on tuning screw 5 to at least 1.36Nm (12 in-lb)
and fine tune tuning screw 5 for a DIP.
The dip of tuning screw 5 will not be as sharp as that for tuning
screws 2, 3, and 4.
14. Turn tuning screw 5 counter-clockwise 6 mm (0.25 in.).
68P81096E17-E
09/30/05