[amsat-bb] Galileo 1260-1300 MHz - Protection Radius

M5AKA m5aka at yahoo.co.uk
Fri Aug 22 19:29:55 UTC 2014

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. 

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

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

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