Sorry Graham that misspelled your name in the last mail.
Have a nice Sunday
Matthias
www.dd1us.de
-----Ursprüngliche Nachricht----- Von: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] Im Auftrag von Matthias Bopp Gesendet: Sonntag, 12. Dezember 2010 12:30 An: 'GRAHAM SHIRVILLE'; amsat-bb@amsat.org Betreff: [amsat-bb] Re: LF Satellite ideas?
Hi Grahma,
I like your idea ... to receive signals at VLF which cannot be heard on the ground and convert them to a frequency band which we can receive ... I guess this will allow us to receive some "sounds from space" which we are otherwise blocked from ...
Best regards
Matthias
www.dd1us.de
-----Ursprüngliche Nachricht----- Von: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] Im Auftrag von GRAHAM SHIRVILLE Gesendet: Sonntag, 12. Dezember 2010 09:52 An: amsat-bb@amsat.org; John Magliacane Betreff: [amsat-bb] Re: LF Satellite ideas?
Hi Bob, If the ionosphere screens all the terrestrial signals at that height then maybe your 136kHz RX could be used to listen to radiation received from outer space at that frequency which normally we cannot listen to on earth. Sound like fundamental research to me but maybe it has already been done and redone. 73 GrahamG3VZV
--- On Sun, 12/12/10, John Magliacane kd2bd@yahoo.com wrote:
From: John Magliacane kd2bd@yahoo.com Subject: [amsat-bb] Re: LF Satellite ideas? To: amsat-bb@amsat.org Date: Sunday, 12 December, 2010, 2:13
--- On Sat, 12/11/10, Bob Bruninga bruninga@usna.edu wrote:
Is 137 KHz possible from space?
Bob,
My understanding is that LF and VLF emissions of terrestrial origin don't get beyond the 'D' layer, even at night. In fact, the 'D' layer acts as a reflector, rather than an attenuator at these frequencies. Cosmic background radiation maintains sufficient 'D' layer ionization at night.
However, your post reminded me of project INSPIRE, which was a plan to transmit VLF signals from the Space Shuttle back in 1992 using a pulsed electron gun in the payload bay. Details on project INSPIRE can be found here:
http://theinspireproject.org/index.php?page=faq
I'm not sure how this would penetrate the ionosphere except through brute force.
Nevertheless, compatible receivers are simple to build and readily available.
73, de John, KD2BD
-- Visit John on the Web at:
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_______________________________________________ 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