That was actually the procedure I used and got it looking good on the 2600s tracking gen. I will try it with band new swept known good cables and do the procedure again and see if I get a different result. I will also throw it on the nanovna and see what it looks like there. I only have 4 or 5 duplexers under my belt. Certainly not the experience many of you all have. I'm still in the learning stage.
Remove all cables and tune each cavity individually - tune the pass for best match (return loss), then set the notch.? As long as the notch wasn¡¯t far off from where it needed to be, adjusting the notch will not ¡°pull¡± the pass.? Then harness everything back together and check the results ¨C it should meet or exceed spec.
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The factory tuning instructions assume you only have a signal generator and some means of detection.? It is decidedly a dumbed-down approach that is going to lead to mediocre results at best.
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Well, per the suggestions here I did get it tuned up and it looked textbook on my r2600 but when I put it on the quantar the quantar went into pa fold back high vswr. I've never had that happen before when a duplexer looked good on a service monitor. Back to the drawing board. Try different known good cabes and retune it and see if maybe I had a bad cable throwing off readings.
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Found the instructions here:
Instructions used an RF millivolt meter for some of the adjustments but I used an HP 8920A service monitor with 6dB pad at the end of the test cable.?
