I see no attenuation at 1376 MHz (close to GPS frequency) when observing pulsars with a radio telescope. Even the brightest pulsar (Vela) is so much fainter than a GPS signal which boom in when they happen to pass into the telescope's beam.
It definitely happens at higher frequencies though. Up around 20 GHz it's a different story. On Tue, 22 Oct 2019 at 17:01, Dana Whitlow <[email protected]> wrote: > A friend of mine living in SE lower Michigan recently bought > a Geppetto GPS clock, and swears that it tends to lose > satellite lock on cloudy days but does OK on sunny days. > > He is admittedly using a very poorly-sited antenna, > placed in a window because his house has aluminum > siding. He reports that his Garmin handheld GPS > has much less trouble acquiring and maintaining lock > on cloudy days than does the Geppetto, but still tends > to show higher levels of probable position error on > cloudy days. I don't yet know if he takes the Garmin > outside for these comparisons. > > Is this a real phenomenon, or is my friend just imagining > things? > > Meanwhile I think I have finally persuaded him to install > the antenna outside on the roof. > > Dana (K8YUM) > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
