[time-nuts] Do ordinary clouds adversely affect GPS reception?

[Jim Palfreyman]

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 <k8yumdoober at gmail.com> 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)
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