Sorry about the last post...It looks like someone screwed around with the
input coils...I have it fired up with the front panel loose and am able to
tune the input coils for a satisfactory swr.
Thanks to all who responded
Marty
----- Original Message -----
From: "2" <2@vc.net>
To: "Allen (Marty) Martin" <kg7da@foxinternet.net>; " AMPS"
<amps@contesting.com>
Sent: Wednesday, March 26, 2003 4:49 AM
Subject: Re: [Amps] High Input Swr SB-220
>
>
> >I have a SB-220 With high input swr. I have ~2.5-1 on 75 at 3850 and much
> >higher than that at 7200. Switches seem to be in sync. Anybody have any
> >Ideas? The caps look to be the right value. I don't want to start
tweaking
> >the coils if I don't need to. Shorted coax? I can drive the amp but of
> >course my solid state rig doesn't like the high swr.
> >I wonder if anybody has any data about tuning the input coils?
> >
> The fix is to up the design Q of the Pi tuned input to something that
> solid-state radios will take. This is covered in the Nov./Dec., 1990 QST
> article. [orig manuscript on my Web site]
>
> cheers, Marty
>
> - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
> www.vcnet.com/measures.
> end
>
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