[amsat-bb] Re: LF Satellite ideas?

[Matthias Bopp]

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 at amsat.org [mailto:amsat-bb-bounces at amsat.org] Im
Auftrag von GRAHAM SHIRVILLE
Gesendet: Sonntag, 12. Dezember 2010 09:52
An: amsat-bb at 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 at yahoo.com> wrote:

From: John Magliacane <kd2bd at yahoo.com>
Subject: [amsat-bb] Re: LF Satellite ideas?
To: amsat-bb at amsat.org
Date: Sunday, 12 December, 2010, 2:13

--- On Sat, 12/11/10, Bob Bruninga <bruninga at 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:

    http://kd2bd.ham.org/



      
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