Brukerveiledning

Channel Spacing
(kHz)
Relative Standard Deviation (RSD)
(kHz)
92% of RS
(kHz)
Tolerance
(Hz)
25.0 5.0 4.6 +0/-100
NOTE:
• The repeater is factory-tuned in accordance to this procedure and specification.
• Verification is performed outside of the Tuner application, such as in normal mode.
8.8
Tuning a Duplexer Module
The duplexer module is shipped untuned. Before installing the duplexer into the repeater, it must be
tuned specifically to the transmit and receive frequency pairs of the repeater.
The duplexer module is composed of three low-pass/high-notch cavities and three high-pass/low-notch
cavities. Each set of three cavities provides bandpass filtering for either the transmit RF signal or the
receive RF signal. In general, the duplexer must be tuned so that the transmit cavity set passes the
transmit signal and rejects the receive signal. Concurrently, the receive cavity set must be tuned to
pass the receive signal and reject the transmit signal.
Tuning is performed by injecting RF signals and making tuning adjustments (using the tuning rods and
trimmer screws) while monitoring for maximum or minimum readings on the RF millivoltmeter. Field
tuning the duplexer module requires the following general adjustments:
• Tune high-pass/low-notch cavities for maximum pass and reject response
• Tune low-pass/high-notch cavities for maximum pass and reject response
• Check high-pass/low-notch and low-pass/high-notch cavities for insertion loss
• Check high-pass/low-notch and low-pass/high-notch cavities for isolation
NOTE: If the duplexer module is tuned and the specifications are within a large margin of error,
the duplexer must be returned to the Motorola Solutions Support Center (SSC) for repair.
Prerequisites: Obtain the following test equipment:
• 2-port network analyzer
• Network analyzer cables
• Open/short/load calibration kit
• Two SMA female to MCX adapters
• N-male to SME female adapter
• Small crescent wrench
• T10 TORX bit and driver
Procedure:
1 Determine the transmit and receive frequencies, as follows:
The less of the two frequencies is the LOW frequency and the greater of the two is the HIGH
frequency. Choose a duplexer that includes both of these frequencies in its tuning range as
indicated on the duplexer label.
a Loosen the tightening nut on the three cavities for each section (six total). See
Figure 23:
SLR 1000 UHF Repeater Band Reject (Notch) Duplexer on page 71 and Figure 24: SLR
1000 VHF Repeater Band Reject (Notch) Duplexer on page 71
MN003557A01-AL
Chapter 8 : SLR 1000 Programming and Tuning
70
Applicant: Motorola Solutions
Equipment Type: ABZ99FT3096B / 109AB-99FT3096B
Tune-Up Procedure
Exhibit D1 7 of 11