It was 1/19 and 1/20/2008. I captured many screenshots of Spectran: http://www.kl7uw.com/raseti.htm bottom of the page the direct signal was 60-dB S+N/N and Moon echo was 20-dB S+N/N. Received on a 40m inverted-V with a FT-847 2.2 KHz bw in USB. Absolute signal level was affected by AGC.
They ran 360MW with 180 turnstyle antennas; HAARP webpage: http://www.haarp.alaska.edu/
73, Ed - KL7UW
At 02:29 PM 1/20/2011, Jeff Yanko wrote:
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.
73,
Jeff WB3JFS
----- Original Message ----- From: "Bob Bruninga" bruninga@usna.edu To: amsat-bb@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
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-1.4kw*, 432-100w*, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep dubususa@hotmail.com ====================================== *temp not in service