Andy, Isn't DirecTV downlinking around 12 GHz? Yet GPS L1 is at only ~1575 MHz. That's a huge difference with regard to scattering losses, and probably a fair amount of difference for water absorption losses as well.
I've recommended that my old friend try putting his GPS antenna up in the attic as close to the peak of the roof as he can do. Thanks, Dana On Wed, Oct 23, 2019 at 12:01 PM Andy <ai.egrps...@gmail.com> wrote: > Having had DirecTV on the roof for a few years, and having experienced > regular significant signal loss events during heavy rain and snow (loss of > reception was a rather good predictor that "the skies were about to open > up" with rain), I can confirm that signal strength deteriorates noticeably > during these events. They are in the same general frequency range. There > are distinct frequencies where the loss is even more significant. > > DirecTV probably tells you that this doesn't happen, but they are wrong; > but that's their salesmen speaking. Experience shows that it's real. When > it rains, I could watch the signal levels drop on their meters, then watch > the channel banks disappear. > > If someone had reasonably good GPS reception, then the signal loss might be > small enough to go unnoticed by the majority of users. If your friend's > reception was already near borderline, then it should be obvious that any > little bit can put it over the top. I think your friend did not imagine > it. I think the loss is more than a few dBs when it's raining, not > trivial. It's probably small when it is just cloudy, but like I say, under > the right conditions even a small change can put it over the top. > > Andy > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
