Motorola MTR3000 Basic Service Manual

MTR3000 Radio Frequency Distribution System (RFDS) Equipment: Field Tuning Procedures 9-31
Figure 9-23 UHF Duplexer Field Tuning Procedure
Boonton 92E RF
Millivoltmeter
Range set to +10 dBm
2. Tuning Low Pass Resonators
1. Set up test equipment as
shown, connecting to cavity no.1.
2. Use nut driver to adjust pass
adjustment screw for cavity no.1
to obtain a peak reading on the
millivoltmeter.
3. Use open end wrench and
tighten lock nut carefully, making
sure pass adjustment screw does
not shift position.
4. Repeat steps 1–3 for cavities
no.2 and no.3.
Frequency set to Rx or Tx frequency,
whichever is LOWER.
Output Level set to +10 dBm.
Resonator Pass Adjustment
Screw and Lock Nut
6 dB In-line
pad (50Ω)
3. Tuning High Pass Resonators
1. Set up test equipment as
shown, connecting to cavity no.4.
2. Use nut driver to adjust pass
adjustment screw for cavity no.4
to obtain a PEAK reading on the
millivoltmeter.
3. Use open end wrench and
tighten lock nut carefully, making
sure pass adjustment screw does
not shift position.
4. Repeat steps 1–3 for cavities
no.5 and no.6.
1 2 3 4 5 6
HP8656B Signal Generator
Boonton 92E RF
Millivoltmeter
Range set to +10 dBm
Frequency set to Rx or Tx frequency,
whichever is HIGHER.
Output Level set to +10 dBm.
Resonator Pass Adjustment
Screw and Lock Nut
6 dB In-line
pad (50 Ω)
1 2 3 4 5 6
HP8656B Signal Generator
1. To Start
Remove cables from the duplexer, noting and label the position of each cable. Each cable is unique and must be
returned to the original position when tuning is complete.

Motorola MTR3000 Specifications

General

Brand	Motorola
Model	MTR3000
Category	Accessories
Language	English