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Re: AO-40 Reception

Has anyone else out there used a Drake with an outboard preamp--
I did all the mods that don't require spending $$$ on the Drake
so far (not the MGA MMIC, Toko Filter)-- which supposedly puts the thing in 
the 6dB ballpark (I'll find out at Dayton I suppose).. I have an old DEM 
2400 MHz (LUA) preamp, measured at CSVHF 2000 to have 11.8 dB gain, and a 
0.82 dB NF.

Interestingly enough, the Drake behind that preamp seems more sensitive than 
the OLD DEM downconverter behind the same preamp.
Which is wierd as the DEM converter should have the same to nominally
less NF.. (It does have less conversion gain, though)...

I guess I'll need to pick up one of those transystems at Dayton and
try it out..

Fred W0FMS

>From: Jesse Morris <w4mvb@juno.com>
>To: amsat-bb@AMSAT.Org
>Subject: [amsat-bb] AO-40 Reception
>Date: Sat, 12 May 2001 10:01:31 edt
>Good Morning,
>Finally got the proper antenna up yesterday and had the Drake and Trans
>System operating side by side this morning.  To my surprise the 3733 was
>noticeably better.  I was able to have QSO's with the 3733 that I could
>just barely detect with the Drake.  I used a 21 turn helix with both
>converters and both antennas used the W0OQC feed.  The Drake antenna was
>built with small fiberglass supports for the boom but the 3733 used one
>inch PVC for the boom.  I could not detect any difference between these
>two antennas when I tested them on the ground.  The Drake has all the
>G0MRF mods and the 3733 has the filter stub cut out.
>Of course there could be other explainnations for the difference so I
>will have to run some more tests to confirm this result.
>73 de Jess - W4MVB
>Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
>To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

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