Hello,
On 12/11/10, Bob Bruninga wrote:
> Is 137 KHz possible from space?
>
> Our next Cubesat will have a 1100 meter long antenna (think tether
> satellite). It will ultimatelly be an electrodynamic tether but the first
> one will have NO ACTIVE ELECTRONICS connected to the tether.
>
> So I hav
--- On Sat, 12/11/10, Bob Bruninga 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. Cos
My initial 1100m long satllite antenna idea (with no knowledge of propogation
possibility through the ionosphere) is:
a) connect a product detector (SSB) receiver to the 1/2 wave 137 kHz satellite
antenna and downlink the audio that it hears on the UHF FM downlink. Then
anyone can hear the 137
In a message dated 12/12/2010 03:18:49 GMT Standard Time, bruni...@usna.edu
writes:
b) Connect a small CW transmitter on 137 KHz to the 1100m antenna and see
if the LOFERS can hear it? But there is no ITU/IARU amateur satellite
authorization there. But again, on-off keying of some elect
done and
redone.
73
GrahamG3VZV
--- On Sun, 12/12/10, John Magliacane wrote:
From: John Magliacane
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 wrote:
> Is 137 KHz possible from space?
Bob,
Hi all,
A 1100 meter long antenna attached to a satellite moving through a very thin
atmosphere would be interesting. My concern would be the static build up of
energy on the antenna leading back to the satellite. I would think it this
would fry any circuitry in the satellite. If I recall co
w.dd1us.de
-Ursprüngliche Nachricht-
Von: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@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 ionosphe
RAHAM 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 spac
that
aspect.
Alan
WA4SCA
-Original Message-
From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On
Behalf Of Jeff Yanko
Sent: Sunday, December 12, 2010 5:26 AM
To: Bob Bruninga ; amsat-bb@amsat.org
Subject: [amsat-bb] Re: LF Satellite ideas?
Hi all,
A 1100 meter long
Hi Bob,
I'm actually wondering if the 1100 meter long antenna would be
visible from the ground. I suppose that depends on the height of the
orbit, the width of the tether, orientation, and what color the tether
will be. Have these been determined? Viewing the tether might be an
interest
Has anyone considered the possibility of applying for an experimental
license for such an experiment?
AA1VS
On Sat, Dec 11, 2010 at 9:13 PM, John Magliacane wrote:
> --- On Sat, 12/11/10, Bob Bruninga wrote:
>
>> Is 137 KHz possible from space?
>
> Bob,
>
> My understanding is that LF and VLF e
Bob -
I apoligize for the tardinesss of reply to your query.
December is a busy time for me with projects finishing and planning for
2011 projects.
I would suggest the University of Alaska's work with Red Sprites and Blue Jets.
http://elf.gi.alaska.edu/
What are Red Sprites and B
Stanford University's VLF Research Group
http://vlf.stanford.edu/research
The Stanford University VLF Group investigates the Earth's electrical
environment, its upper atmosphere, lightning discharges, radiation belts, and
the ionized regions of upper atmosphere known as the ionosphere and
not 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 wrote:
>
>From: John Magliacane
>Subject: [amsat-bb] Re: LF Satellite ideas?
>To: amsat-bb@amsat.o
--- On Sun, 12/12/10, Bob Bruninga wrote:
> So if we can hear a 1W amsat on 2m, then we should be able
> to hear a 1 milliwatt transmitter on 160m with 20 dB
> stronger signal! (Of course noise level can easily be 20 dB
> stronger?)
Bear in mind there are no Amateur Satellite Service allocations
Hi Bob.
> Drats. Bad news.. Good news!
I don't think the ionosphere will allow 160 meter downlink propagation... on a
regular basis, at least.
UoSAT-OSCAR-9 carried HF beacons on 7, 14, 21, and 28 MHz, and if I recall
correctly, the only beacon never heard was the one on 7 MHz.
So, receiving
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