[amsat-bb] Re: ARISS Antenna Specifics
lcfowler at magma.ca
Tue Dec 30 19:59:28 PST 2008
Thanks for the info Frank.
While the spiral dual L/S band ant may nominially be Left Hand Circular
it must be highly eliptical otherwise I would not be getting into it at all
with 10 watts into my Right Hand Helix antenna array. I have Right Hand
and Left Hand helix antennas for 70 cm and on AO-51 when I switch
to the wrong polarity an over S9 signal drops by more than 20 db into the
So whatever the polarity it is possible to get into ISS on L band
with Right Hand uplink although Left Hand should be better.
----- Original Message -----
From: "Frank H. Bauer" <ka3hdo at comcast.net>
To: <amsat-bb at amsat.org>
Sent: Tuesday, December 30, 2008 12:52 PM
Subject: [amsat-bb] ARISS Antenna Specifics
> The ARISS L-band/S-band antenna systems are Left Hand Circularly
> There are some good details of the antenna systems in this paper:
> And this presentation:
> Chart 25 of the above presentation shows the antenna locations looking
> the axis of the Service Module. In this picture, the ISS velocity vector
> either in or out of the page and Earth is towards the bottom of the page.
> This assumes they are in the normal Earth pointing mode (which is not
> a given).
> We have some good on-orbit views of the antennas in this set of charts
> I hope this helps. And thanks for all the interest in ARISS.
> 73, Frank, KA3HDO
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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