Are you asking about amateur satellite operation or TV reception via
satellites? Although Dominique’s explanation of digital satellite
signals passing through glass may be explained on paper, it has no merit
in actual use. Some glass has attenuation at C/Ku frequencies but this
purely shows up as signal reduction with associated loss of C/N, BER,
etc in digital systems. Analog and digital satellite reception are
affected the same.
Bob


Dominique Michel wrote:
Le Sat, 05 Aug 2006 11:38:23 GMT,
ml a écrit :

hi

thinking about getting into sat's, and have a newbie question

i may only be permitted to put up my antennas on a part of the roof that
would be blocked by a structure(elevator room)

so in 1 compass direction or so to almost straight up i would be blind

question:

so is their a particular compas headding that is best to loose?

It MUST be a direct view from the antenna to the sat. Otherwise is it
just to forget it. With analog reception, the antenna can work very
well through a glass window, or while directing the antenna on a
reflexion (at least if you can afford a high end tuner in this last case),
by but with digital reception, even a tiny glass will cause a
lot of trouble (some channels will just disappear), because the digital technique use phase multiplexing
and the phase of the signal will change in a non linear fashion through
the glass or on a reflexion.

Dominique