9-30 MTR3000 Radio Frequency Distribution System (RFDS) Equipment: Field Tuning Procedures
9.5.2.1.3 Duplexer Tuning Procedure
The duplexer field tuning procedures are provided in Figure 9-23 to Figure 9-26. The procedures are
most easily performed with the duplexer module removed from the base station/repeater rack or
cabinet. Be sure to take note of the transmit and receive frequencies for the particular base station/
repeater before beginning.
If the duplexer module is tuned according to instructions and does not meet specifications for return
loss, insertion loss, and/or isolation, return the duplexer for repair.
The notch (reject) frequency will maintain its spacing to the pass frequency when the pass
adjustment of a cavity is moved several MHz. For example, a system operating at 455 MHz and 460
MHz, which is moved to 460 MHz and 465 MHz will require a minimum of readjustment if the pass
adjustment is made first. It is therefore recommended that the pass adjustments be made first and
that the procedures provided in Figure 9-23 to Figure 9-26 are followed.
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