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CX2SA > SATDIG 11.12.10 21:12l 103 Lines 3047 Bytes #999 (0) @ WW
BID : AMSATBB5487
Read: GUEST
Subj: AMSAT-BB-digest V5 487
Path: IZ3LSV<IK2XDE<DB0RES<DK0WUE<7M3TJZ<ZL2BAU<N9PMO<VE2PKT<F1BBI<CX2SA
Sent: 101211/2005Z @:CX2SA.LAV.URY.SA #:38228 [Minas] FBB7.00e $:AMSATBB5487
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: celestrack not available? (Mark L. Hammond)
2. Re: LF Satellite ideas? (francesco messineo)
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Message: 1
Date: Sat, 11 Dec 2010 14:10:15 -0500
From: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
Subject: [amsat-bb] Re: celestrack not available?
To: Luc Leblanc <lucleblanc6@xxxxxxxxx.xx>, amsat-bb@xxxxx.xxx
Cc: eu-amsat@xxxxxxxxxxx.xxx
Message-ID: <hvAH1f00Z56cfur05vAMpi@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
I found it was down for a while, but then it came back up. Didn't check
moments ago, but I saw it was down for a while...
73,
Mark N8MH
At 11:28 AM 12/10/2010 -0500, Luc Leblanc wrote:
>Celestrak web site in off line as of 1630 UTC did anyone succeed to access
the site as orbitron cannot perform his TLE'S update and the
>site himself is unavailable?
>
>"-"
>
>
>Luc Leblanc VE2DWE
>Skype VE2DWE
>www.qsl.net/ve2dwe
>DSTAR urcall VE2DWE
>WAC BASIC CW PHONE SATELLITE
>
>
>_______________________________________________
>Sent via AMSAT-BB@xxxxx.xxx. 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
Mark L. Hammond [N8MH]
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Message: 2
Date: Sat, 11 Dec 2010 20:51:39 +0100
From: francesco messineo <francesco.messineo@xxxxx.xxx>
Subject: [amsat-bb] Re: LF Satellite ideas?
To: Bob Bruninga <bruninga@xxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<AANLkTiksRh+S+gvp5Zm7yPj16AtYE+RFh1Yo0tizNmQC@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hello,
On 12/11/10, Bob Bruninga <bruninga@xxxx.xxx> 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 have asked them to make it 1100m long instead of a generic 1km tether
> to try to make it resonant in an amateur band. THe path loss at 137 KHz is
> 60 dB LESS than it is at 2 meters, so it shouldn't take much to communicate
> with an 1100m long antenna.
>
> I'm sorry I didnt think of this sooner, but I need a real SCIENCE
> justification for this. Maybe LF that low will never punch through the
> ionosphere, or maybe it will be completely absorbed. Can give good science
> on this idea?
I think the general opinion is LF will never punch through the
ionosphere, but this might only proved with a beacon orbiting and
ground stations listening.
73
Frank IZ8DWF
------------------------------
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Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
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End of AMSAT-BB Digest, Vol 5, Issue 487
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