[amsat-bb] Re: 10mtr and Galileo

[Bill Ress]

Hi Trevor,

Agreed that a terrestrial 1.2 GHz Amateur transmission can cause
interference to Galileo, so will the ground ATC radars and myriad of other
possible signals like the 3rd harmonic of 420 to 433 MHz signals or
harmonics of high power TV transmitters (and the list goes on).

In light of this, Galileo is stated to have the capability to "detect,
isolate and mitigate interference." They have a two year study program
called MAGIC to work the issue of interference
(see galileoju.org).

Also see:
http://uranium.stu-dif.com/QuickPlace/sensors-processing/PageLibraryC12570C1
005A34E8.nsf/h_Index/6A2577AA3F531D6BC12570C1005A49F6/?OpenDocument

I would guess that the result of the study could provide one of two
conclusions: 1) they can technically handle interference or 2) they can't
and will insist that governments take Amateurs, ATC radars and any other
interferers off the air.

I'm thinking 1) will prevail and we can all rest easy until the next
financially lucrative use of the frequencies comes about.

But your right - we're looking at 4 to 5 years before we'll know what is
reality.

Regards...Bill - N6GHz



-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org]On
Behalf Of Trevor
Sent: Monday, September 11, 2006 2:04 PM
To: AMSAT BB
Subject: [amsat-bb] Re: 10mtr and Galileo


--- jules at g0nzo.co.uk wrote:
> 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

For me the key point is that Peter estimated that a single Amateur Radio
beacon
operating at 1296 MHz such as that at Martlesham could force every Galileo
receiver out of lock over a radius of 16 km (10 miles).

It's not just the increase in noise floor that needs to be considered, it's
the
concern that a typical Amateur station will jam Galileo receivers over a
wide
area. If at some point in the future that transponder were used for what
might
be losely interpreted as "safety critical" applications then  would forsee
Amateur Radio activities either being suspended or power levels being
severely
curtailed in 1260-1300 MHz.

Now it's going to be 2012 before they get the Galileo system fully
operational
so we should at least get 4 years use out of the P3E "L" uplink. What
happens
post 2012 is a big unknown.

73 Trevor M5AKA






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