[amsat-bb] Re: 40m EME (AMSAT 0)

Jeff Yanko wb3jfs at cox.net
Thu Jan 20 15:29:37 PST 2011

Hi Bob and all!

I recall there was a HAARP experiment in, or near the 40 meter band.  If I 
recall correctly, Randy, K7AGE, had recorded it for a youtube segment.  I 
foget the power and gain at the site, but it was no doubt impressive.


Jeff  WB3JFS

----- Original Message ----- 
From: "Bob Bruninga" <bruninga at usna.edu>
To: <amsat-bb at amsat.org>
Sent: Thursday, January 20, 2011 3:17 PM
Subject: [amsat-bb] 40m EME (AMSAT 0)

>> Subject: [amsat-bb] Re: FW: Re: em40 needed
> I misread this as something to do with 40m EME and got so distracted doing
> the calculations that I may as well post them.
> By my guess, if one could find an abandoned K mart parking lot with 160'
> spacing between light poles (about 30' high), one could hang 16 dipoles. 
> If
> it was over GOOD swamp land, that might equal about 14 dB antenna gain.
> The path loss at 40m is 36 dB better than at UHF so the link would be 
> about
> 0 dB SNR on a CW signal maybe.  But from this one has to subtract a huge
> amount of noise on 40m.  And it would only work at high elevations with
> really QUIET sun cycle. (you could point it with some phase 
> adjustments)...
> But several dB of processing gain via DSP could bring it back up?
> These are only wild  guesses.  But it was fun.  I'd love to see an 
> expert's
> calculation just for the drill.
> Bob, WB4APR
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