[amsat-bb] Re: MMIC for LEO preamp?
adkins92rod at earthlink.net
Wed Nov 26 07:45:00 PST 2008
I have built a number of DEM pre-amp kits
I am fortunate enough to have the loan of a Noise measuring set - & have
found that the tuning for lowest noise & highest gain are often WAY apart
My input would be - if you have no way to measure noise performance, buy
the ready-built preamp - I have also gone this route, & been very satisfied
Re MMICs - I have built a large number of these for various freqs &
purpose, using DEM PCBs
Besides the poor NF, these amps are VERY broadband, totally unsuitable for
head-end preamp (IMHO <g>)
Rod Adkins WI6M nr San Diego
17917 Lyons Valley Road
Jamul, CA 91935
> [Original Message]
> From: Curt Nixon <cptcurt at flash.net>
> Cc: <amsat-bb at amsat.org>
> Date: 11/26/2008 7:19:46 AM
> Subject: [amsat-bb] MMIC for LEO preamp?
> SO...now I have made a few contacts on AO-51 and SO-50. Now I need to
> get better ears.
> I have a very simple mode J setup using a couple of old mobil rigs--the
> rx unit is an IC 2350H. 10 el cheap yagi through 60ft of LMR400.
> I'm considering options for a mast preamp for rx only. I'll be using a
> diplexer for desense ahead of it, and eventually add coaxial switching
> so I can use TX.
> I'll feed with power through extra wire in rotor cable.
> Looking at the Hamtonics, DEMI kit and a hombrew from scratch.
> 1. Any experiences with the DEMI units as kits?
> 2. with there relatively high NF, are the MMIC devices like the ERA
> series, at all appropriate for simple mast preamps for entry level
> Thanks to all.
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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