The notch "generally" will track the pass as it's adjusted, but it's not a
fixed-offset kind of thing. If you retune one of the cavities +1 MHz, the
notch may move +1.1 MHz, or +0.9 MHz, or ...you get the idea. So, no, you
can't just re-tune the pass and assume the notch has followed exactly.
--- Jeff
> -----Original Message-----
> From: [email protected]
> [mailto:[EMAIL PROTECTED] On Behalf Of Ken Arck
> Sent: Sunday, April 09, 2006 7:30 PM
> To: [email protected]
> Subject: [Repeater-Builder] Sinclair Q-201G duplexer
>
> Hi folks
>
> I know the "stock" answer, but I'm looking for the non-stock
> one :-) (and
> yes, I've read the manual!).
>
> But I was wondering (and checking my rationale here)..... in
> many Bp/Br
> cavities, the notch tuning actually tunes to a certain freq
> above or below
> the pass-tuned frequency. Therefore, if moving the duplexer a
> meg or two
> but you maintain the same offset spacing, can you simply get away with
> retuning the pass freq and, all other things being equal
> (port impedance,
> etc), is that all that is needed?
>
> Manuals always seem to talk about tuning but rarely (if ever)
> REtuning...
>
> Ken
> --------------------------------------------------------------
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