[amsat-bb] Re: 10mtr and Galileo

[John B. Stephensen]

Galileo transmits on 1260-1300 MHz and 1215-1300 MHz is now allocated to
global positioning systems (up to 5 of them). Amateur transmissions can
desense the earth-based receivers. Tests on U.S. GPS receivers showed that a
1W EIRP CW signal 10 km away would cause inteference. It would be better if
1260-1270 MHz was a downlink for amateur satellites.

73,

John
KD6OZH

----- Original Message ----- 
From: "joseph Murray" <k0vty at juno.com>
To: <kd6ozh at comcast.net>; <amsat-bb at amsat.org>
Sent: Monday, September 11, 2006 03:11 UTC
Subject: Re: [amsat-bb] Re: 10mtr and Galileo


> John I am confused
>
> Please provide something to cure my problem
>
> I believe at this point that the Galileo bird transmits to receivers on
> the ground
> in the current amateur mode L up link  spectrum.
> Right or wrong?
> What frequency in the same amateur L mode spectrum is the Galileo using
> for receiving.
>
> Joe Murray K0VTY
> Amsat #860
> ==============
> On Mon, 11 Sep 2006 02:47:22 -0000 "John B. Stephensen"
> <kd6ozh at comcast.net> writes:
> > What bothered people is the fact that we need high power L-band
> > uplinks and
> > the statement in the report that "there is the potential for most
> > amateur 23
> > cm transmissions to interfere with Galileo unless the Galileo
> > receivers are
> > designed and built to withstand it".
> >
> > 73,
> >
> > John
> > KD6OZH
> >
> > ----- Original Message ----- 
> > From: <jules at g0nzo.co.uk>
> > To: <amsat-bb at amsat.org>
> > Sent: Sunday, September 10, 2006 23:37 UTC
> > 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
> > >
> > > _______________________________________________
> > > Sent via AMSAT-BB at amsat.org. 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
> >
> > _______________________________________________
> > Sent via AMSAT-BB at amsat.org. 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
> >
> >