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Re: filter mod to the TransSystem 3733



Has anyone looked at just adding notch stub for 2155 MHz?  It would go right
where the removed stub was.

73,
Joe
ka0yos@amsat.org

----- Original Message -----
From: "Art Goldman" <aegoldm@lts.ncsc.mil>
To: "Pieter Ibelings" <elpieter@hotmail.com>
Cc: "amsat-bb" <amsat-bb@AMSAT.Org>
Sent: Tuesday, May 15, 2001 9:36 AM
Subject: [amsat-bb] filter mod to the TransSystem 3733


> Pieter:
>
> I've been following the messages about modifications to the
> 3733, and after cutting the stub and observing the much
> improved performance (but higher noise floor), I'm ready to
> take "the next step".
>
> I now have a couple of Toko 2450 dielectric filters and 1/4"
> copper tape from Digi-Key, and some MMIC boards should be
> shipped from DEM today.
>
> When I begin to dissect my 3733, what should I do to the
> existing filters? Obviously, I'll start by removing the
> tops. When I get inside, how difficult is it to desolder the
> rest of the filter components?
>
> I looked at the picture on your web site, and it looks like
> you cut one edge off the MMIC board and overlayed it on the
> input filter so as to bypass the signal across it?
>
> On the second filter, I guess you did the same thing but
> used the remaining MMIC board area to mount your filter. The
> Toko has two tabs on one side and three on the other. I
> can't tell which is input and which is output -- does it
> matter? Their documentation doesn't really indicate an input
> and output.
>
> It also looks like you used larger than 1/4" copper tape to
> mount the MMIC board stock (or maybe the picture dimensions
> are misleading). I guess I can overlap the tape I have so it
> covers to the groundplane on the 3733 main board.
>
> Any other hints/warnings you could pass along would be
> greatly appreciated.
>
> Tnx and 73,
> Art N3OY
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