Galileo 1260-1300 MHz - Protection Radius
In a previous post I mentioned a paper written in 2006 which indicated a 700 watt ERP amateur station might knock out a users 1260-1300 MHz Galileo receiver at a distance of 18 km. http://www.southgatearc.org/articles/galileo.htm
This may be a considerable underestimate.
Two German ATV repeaters were shut down due to interference to a user's Galileo receiver which was being used to evaluate the initial 4 test satellites, the repeaters were:
DB0QI which was 18 km from the receiver
and DB0ITV which was 55 km from the receiver
My understanding is that both repeaters were running an ERP of just 15 watts, but I've been unable to confirm that figure.
The first two satellites of the operational Galileo GPS constellation were launched today to be followed by the rest over the next 3 years.
Given the substantial investment in these satellites it seems to me likely that more European countries will follow the example of Germany and Austria and seek to protect the 1260-1300 MHz downlink.
73 Trevor M5AKA
Interesting. Few weeks back I spoke with a member of the Italian CC, as our club was going to add a 1296MHz port to a local repeater. He said Alenia Space has submitted strong warnings regarding possible interference with Galileo and he anticipated it could be hard to get a frequency assigned in that portion of the spectrum in the near future.
Alessio IZ4EFN
On Fri, Aug 22, 2014 at 9:29 PM, M5AKA m5aka@yahoo.co.uk wrote:
In a previous post I mentioned a paper written in 2006 which indicated a 700 watt ERP amateur station might knock out a users 1260-1300 MHz Galileo receiver at a distance of 18 km. http://www.southgatearc.org/articles/galileo.htm
This may be a considerable underestimate.
Two German ATV repeaters were shut down due to interference to a user's Galileo receiver which was being used to evaluate the initial 4 test satellites, the repeaters were:
DB0QI which was 18 km from the receiver
and DB0ITV which was 55 km from the receiver
My understanding is that both repeaters were running an ERP of just 15 watts, but I've been unable to confirm that figure.
The first two satellites of the operational Galileo GPS constellation were launched today to be followed by the rest over the next 3 years.
Given the substantial investment in these satellites it seems to me likely that more European countries will follow the example of Germany and Austria and seek to protect the 1260-1300 MHz downlink.
73 Trevor M5AKA _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Thanks Alessio,
It seems we need to start looking for replacement Amateur-Satellite Service spectrum in L-Band.
The first hurdle is to get IARU agreement on the need for replacement spectrum, hopefully someone from AMSAT-NA is keeping ARRL briefed on the matter since ARRL is a major force within IARU.
Getting the item on the WRC-2018 agenda will be a major challenge since Agenda items are usually defined at the previous conference WRC-2015.
73 Trevor M5AKA http://amsat-uk.org/2014/08/13/23-cm-band-and-wrc-2018/
On Friday, 22 August 2014, 21:43, Alessio Sacchi iz4efn@gmail.com wrote:
Interesting. Few weeks back I spoke with a member of the Italian CC, as our club was going to add a 1296MHz port to a local repeater. He said Alenia Space has submitted strong warnings regarding possible interference with Galileo and he anticipated it could be hard to get a frequency assigned in that portion of the spectrum in the near future.
Alessio IZ4EFN
On Fri, Aug 22, 2014 at 9:29 PM, M5AKA m5aka@yahoo.co.uk wrote:
In a previous post I mentioned a paper written in 2006 which indicated a 700 watt ERP amateur station might knock out a users 1260-1300 MHz Galileo receiver at a distance of 18 km. http://www.southgatearc.org/articles/galileo.htm
This may be a considerable underestimate.
Two German ATV repeaters were shut down due to interference to a user's Galileo receiver which was being used to evaluate the initial 4 test satellites, the repeaters were:
DB0QI which was 18 km from the receiver
and DB0ITV which was 55 km from the receiver
My understanding is that both repeaters were running an ERP of just 15 watts, but I've been unable to confirm that figure.
The first two satellites of the operational Galileo GPS constellation were launched today to be followed by the rest over the next 3 years.
Given the substantial investment in these satellites it seems to me likely that more European countries will follow the example of Germany and Austria and seek to protect the 1260-1300 MHz downlink.
73 Trevor M5AKA _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. 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@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
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