The tuning for the WP-642 is the same as the 641, but you'll have to tune the additional 2 cavities on the radio side; which are simply Band-Pass: http://www.repeater-builder.com/pdf/wp641.pdfKevin
This may also help:
http://www.repeater-builder.com/pdf/wp643.pdf
Kevin
I *may* have gotten the 642 and 643 mixed up. At any rate, the information is in the two PDF's above.
The 642 *appears* to have 6-BPBR cavities, whereas the 643 is 4-BPBR (like the 641) with 2 additional BPF's on the radio side.
It's early...... WCIS
Kevin
Yes, the 642 has 6 BP/BR cavities, unlike my 222Mc duplexer (WP-652) that has 4 BP/BR cavities with 2 BP cavities like the 643. Thanks for the links.
-KGB
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