[amsat-bb] Galileo interference on L band
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.
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
More information about the AMSAT-BB