On 9 Oct 2014 22:17, "Andrew Rodland" <[email protected]> wrote: > > You pick up satellite TV with a parabolic dish that points at one spot > in the sky where the geostationary satellite lives. A sun outage > happens when the sun wanders into the focus and overloads the receiver > with noise that drowns out the satellite signal (at least, it raises > the noise floor enough that you can't receive the high bitrates needed > for a TV picture). > > You pick up GPS with a whole-sky antenna that receives signals from > the constantly-moving swarm of GPS satellites. It undoubtedly receives > some noise from the sun, but the only factor in how much of that you > get is the sun's elevation above the horizon. It's not really relevant > whether the sun is "aligned with a satellite" or not. Even if it was, > the satellite would be somewhere else a minute later. :) > > Andrew
Also the much higher gain of the satellite antenna means if the Sun is in its beamwidth, a much larger increase in noise will occur. I would actually be concerned about the Sun heating (melting ??) the receiver, like I expect we have all done with a magnifying glass. The capture area of a dish is a lot more than any "normal" magnifying glass. Dave _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
