On 10/21/19 10:06 PM, Dana Whitlow 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?
Clpuds and even light rain won't change the received SNR very much at L
band.
I'm going to guess that there's something that is cloud correlated -
open and closing ventilation shutters? Soil or ground cover moisture
changes, which changes the strength of a multipath signal. Some sort of
thermal expansion effects changing the spacing of siding panels when the
sun shines on them vs no.
Meanwhile I think I have finally persuaded him to install
the antenna outside on the roof.
Dana (K8YUM)
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