> Don't tune pass or pass/reject cavities with a tracking generator and
> spectrum analyzer which shows only insertion loss. Don't. Don't.
> Don't. You need to look at return loss. Search the archives - this
> issue has come up and beaten down on more than one occasion...
So you can't tune them on the real transmitter under power, they'll be
damaged.
You can't pad down the transmitter and tune them, that changes the
impedance.
You can't tune them on a spectrum analyzer, not the same impedance or
cables, and dosen't show return loss.
You can't tune them on a network analyzer, since it's not the same
impedance as the transmitter, and won't use the same cables.
If I take all the opinions I've seen in the last month as fact, then
the pass adjustments on duplexers can't be tuned. (Except by wizards at
Mount Wacom, who use equipment that resides in the fifth dimension.)
Notches though, are easier.
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