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Re: 10mtr and Galileo



Hi Jules,

Thanks a bunch for referencing your link. It is a MUST READ for EME and
satellite operators - not to mention AMSAT leadership.

That link was the source of my earlier comments, including the remark about
the "US jamming or worse" (the worse alluding to taking the satellites
down)."

I would like the AMSAT decision makers to detail the reasoning for dropping
the L-Band Uplink like a hot potato besides the "Galileo" excuse. As yet, I
can't find it in Eagelpedia.

In view of Peter Blair's (G3LTF) paper (PLEAS SEE JULES LINK BELOW) I cannot
see any rational for dismissing Eagle use of the L-Band satellite Uplink
allocation.  I don't thing using the statement that "we will lose our L-Band
allocation" is indicative of the much appreciated "science" the team is
bringing to the Eagle design process.

Now if it was a trade-off between the Eagle uplink being at S-Band, as is
now propose, instead of at L-band on the basis of limited space, current,
etc., that's one thing. I could understand that decision.

By the way, the Galileo "shoot down" was me being dramatic. The US and the
EU have since signed an agreement for making the technical standards between
GPS and GNSS compatible and allowing "countries" to disable the capabilities
over certain regions (which satisfied the US concerns).

Regards...Bill - N6GHz

-----Original Message-----
From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org]On
Behalf Of jules@g0nzo.co.uk
Sent: Sunday, September 10, 2006 4:38 PM
To: amsat-bb@amsat.org
Subject: [amsat-bb] Re: 10mtr and Galileo


Just for the record, the first Galileo satellite has already been launched:
http://news.bbc.co.uk/2/hi/science/nature/4566264.stm

Also there was a study made by the UK microwave group (the body representing
UK amateur interests above 1GHz), which makes interesting reading. It
suggests that the signals from Galileo would have little impact on
terrestrial/EME 23cms opperation. Obviously the conclusions woule require a
little re-interpretation, with respect to satellite based reception. But as
Galileo transmissions will presumably be aimed at the earth, so that any
amatuer satellite will receive signals greater than that on earth, for a
minute part of it's orbit, I would think that the conclusions drawn would
still be valid. It's an interesting read:
http://www.microwavers.org/papers/iaru/C5-13_Galileo.pdf

Jules
G0NZO


>Speaking of allocations being taken away, I just can't fathom the AMSAT
>decision to drop L-Band up because of the "Galileo Affair." Now that's a
>decision based on "crystal ball engineering" and not fact. I've even read
>that if Galileo ever was launched - and that appears in the latest press to
>be questionable" the US "would has threatened to shoot them down!"
>
>Regards...Bill - N6GHz

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