[amsat-bb] Re: mmds downconverter

Auke de Jong sparkycivic at shaw.ca
Fri Nov 13 21:00:43 PST 2009

I have a cousin to this converter (visually identical) and I found that it 
is very sensitive to low input voltage such as that caused by a lossy 
inserter, or insufficient supply current, such as that provided by my Yaesu 
Ft-847.  It will operate at 12V, but is much less noisy and more stable at 

The dipole on the end, can be easily replaced with a flange-mount N-type or 
BNC jack, by only reaming out the existing screw holes, or just mount it 
as-is in fromt of your reflector.  I also pig-tailed the I.F. connector 
using a section of RG-59, an F-connector crimped on one end, and a 
solder-type uhf on the other(it fits well-enough).

This is a handy piece of kit, and supports much wider useful bandwidth than 
that specified(depending on the comb filter configuration inside).  Mine 
goes down to at least 2330(6M I.F.) as tested receiving the XM Satellite 2 
kW local rebroadcast station 5 miles from here, having the comb filter 


----- Original Message ----- 
From: "Bob- W7LRD" <w7lrd at comcast.net>
To: <amsat-bb at amsat.org>
Sent: Wednesday, November 11, 2009 12:45 PM
Subject: [amsat-bb] mmds downconverter

> Hello
> Has anyone had any experience with a GIDDC-2278 S band downconverter?
> http://servsat.com/pdfs/PDFInalambricas/ServsatGIDDC22Series.pdf
> I would like to convert it for a two meter IF. Got a new one pretty cheap.
> 73 Bob W7LRD
> Seattle
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