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Re: Re-crystaling Microwave Modules 432/28 Transverter


I see that Domenico i8CVS has already given you a very detailed description
of his MM transverter.

MM made an improved version of their 432-10 MHz transverter, where the band
coverage is extended with two switches.  I have the original documentation
of this transverter and can forward it to you, if required.

Deon ZS1ZL

----- Original Message -----
From: "Bruce Robertson" <broberts@mta.ca>
To: <amsat-bb@AMSAT.Org>
Sent: Wednesday, March 17, 2004 5:05 PM
Subject: [amsat-bb] Re-crystaling Microwave Modules 432/28 Transverter


I recently bought a second-hand Microwave Modules 432 -> 28 MHz transverter
on Ebay in order to gear up for CW/SSB LEO work. I had thought that all of
these provide a means of working on 435, too, but it seems mine doesn't.
I'm wondering if anyone has experience re-crystaling these models. In
particular, since the existing lo xtal is a 101 MHz, I was thinking of
buying the 101.750 crystal from Down East Micro.

If no-one has direct experience with this model, general advice would also
be welcomed. I suppose the question here is how broad-band the lo osc.
tuned circuit and the rest of the filters, etc. are. I've never done any
homebrewing in UHF/VHF territory, so I'm a bit unsure. In any case, I'm
guessing that swapping an xtal isn't going to bust anything, so it might be
worth it as an experiment.

Bruce Robertson, VE9QRP
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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