Motorola MTR3000 Basic Service Manual

9-34 MTR3000 Radio Frequency Distribution System (RFDS) Equipment: Field Tuning Procedures
Figure 9-26 UHF Duplexer Field Tuning Procedure (continued)
Monitor Function.
Center frequency set to Tx or Rx
frequency, whichever is LOWER
Attenuator set to -50 dBm
Aeroflex 3900 Series Communications System
Analyzer
Attenuator set to 0 dBm
7.Verifying Isolation
1. Connect test equipment as
shown.
2. Observe and note the level in
dBm as shown on the Aeroflex 3900
Series Communications System
Analyzer display.
3. Connect the test equipment to the
duplexer as shown.
4. Observe and note the level in
dBm as shown on the Aeroflex 3900
Series Communications System
Analyzer display. (If no number is
displayed, consider isolation to be
greater than 105 dB, which exceeds
the specification.)
5. Subtract the absolute number
noted in Step 4 from the number noted
in Step 2. The difference should be
higher than 100 dB to meet
specification for Isolation.
6. Repeat Steps 1–5 for Low- Pass/
High Notch cavities with the following
exceptions:
a. Set Frequency Generator and
Aeroflex 3900 Series
Communications System Analyzer
for Rx or Tx frequency, whichever is
HIGHER
b. Connect Signal Generator to
Low Pass duplexer input (cavity
no.1)
c. Connect terminator to cavity
no.6.
Frequency set to Rx or Tx frequency,
whichever is LOWER.
Output Level set to +10 dBm.
HP8656B Signal Generator
HP8656B Signal Generator
UG29A/U Bullet
Connector
Aeroflex 3900 Series Communications System
Analyzer
50 Ω Terminator
6 dB In-line
pad (50 Ω)
1 6

Motorola MTR3000 Specifications

General

Brand	Motorola
Model	MTR3000
Category	Accessories
Language	English