[amsat-bb] Galileo interference on L band

Marc Franco lu6dw at yahoo.com
Wed Sep 20 12:03:06 PDT 2006


Galileo is circularly polarized, so using the opposite
polarization sense will help.

An excellent paper on Galileo interference was written
by Peter Blair, G3LTF, a well known moonbounce
authority and outstanding engineer. The paper can be
found following this link:


73, Marc N2UO

--- "John B. Stephensen" <kd6ozh at comcast.net> wrote:

> Unfortunately, the Gaileo downlink covers 1258-1299
> MHz, the first satellite 
> has been lanched and the satellites in the
> constellation will be on over the 
> entire world. Our uplink antennas have sidelobes
> that are 10-20 dB down, so 
> a 1 kW EIRP SSB uplink results in 10-100 W radiated
> towards terrestrial 
> receivers. A 256 kbps uplink would require 16 kW
> EIRP and be 0.5-1 MHz wide.
> P3E has a second L receiver tuned to a null in the
> Galileo signal (there is 
> only one null in the 1260-1270 MHz band) but no one
> knows if this will help. 
> SSB users can move to the U uplink if L is a
> problem. However, this only 
> works for narrowband signals. A wideband uplink
> won't fit in the null and 
> can't move down in frequency.
> 73,
> John

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