Do 3/4 wavelength cavities use 1/4 wave interstage coupling cables? I
recently bought some used DB-4023 bandpass duplexers and the coupling cables
are aprox. 1/2 wavelength ??
~Mike N6KYD~
----- Original Message -----
From: "Steve Bosshard" <[EMAIL PROTECTED]>
To: <Repeater-Builder@yahoogroups.com>
Sent: Monday, March 15, 2004 2:42 PM
Subject: RE: [Repeater-Builder] duplexers
> I have it on good advice from Lloyd Alcorn at Wacom Products (RIP Wacom)
> that Black Magic is involved.
>
> Steve
>
> In a nutshell, the cavities are either 1/4 or 3/4 wavelength with
> coupling loops oriented for a particular degree of coupling, and also
> the length affects coupling. Some cavities use 2 loops in band pass
> configuration, and some use one loop for band pass / band reject
> configuration. Cable lengths plus coupling loop length are set for 1/4
> wavelength taking into account velocity factor of the cables and
> connector length. Interstage cable length has large impact on loss.
>
> Get everything just right and it might work.
>
> 73,
>
> Steve
> NU5D
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> Yahoo! Groups Links
>
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>
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