9-18 MTR3000 Radio Frequency Distribution System (RFDS) Equipment: Field Tuning Procedures
1. Unit connection
a. If necessary, disconnect and remove the 435–470 MHz band preselector assembly from
the rear of the base station/repeater.
b. Connect the 435–470 MHz band preselector to the NWA via the adaptors and cables
shown in Figure 9-8.
c. Using the torque driver and deep well socket, loosen all three tension nuts on the adjust-
ment screws.
d. Detune the preselector by turning tuning (ONLY) screws 3 and 4 full clockwise until they
just bottom out.
Figure 9-8 Connection of the 435–470 MHz band preselector
2. Unit Tuning
a. Initial Curve
With the detuned preselector, the NWA display should be similar to that shown in the full
START-STOP bandwidth of Figure 9-9.
To expand and thus better display the curve, readjust the STOP band value to a lower value
(such as 505 MHz as shown in Figure 9-10).
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