9-14 MTR3000 Radio Frequency Distribution System (RFDS) Equipment: Field Tuning Procedures
9.5.1.1.4 Tuning Procedure
1. Apply AC power to the base station/repeater PS (to provide an active 50 Ω termination).
2. Adjust the signal generator to the frequency calculated in the previous steps. Set the level to
+5 dBm.
3. Insert tuning probe into cavity U2, and adjust tuning screw 2 for a PEAK.
4. Tighten tension nut on tuning screw 2 to at least 1.36Nm (12 in-lb) and fine tune tuning screw
2 for a PEAK.
5. Keep tuning probe in cavity U2 and adjust tuning screw 3 for a DIP.
6. Tighten tension nut on tuning screw 3 to at least 1.36Nm (12 in-lb) and fine tune tuning screw
3 for a DIP.
7. Insert tuning probe into cavity U3. Decrease output from signal generator to -5 dBm.
8. Adjust tuning screw 4 for a DIP.
9. Tighten tension nut on tuning screw 4 to at least 1.36Nm (12 in-lb) and fine tune tuning screw
4 for a DIP.
10. Mount the preselector assembly in the Station, and reconnect the previously-removed
cabling.
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