> --- Original message ---
> from: "Tom Clark, K3IO (ex W3IWI)" <[EMAIL PROTECTED]>
> to: time-nuts@febo.com
> concerning: Re: [time-nuts] Rain, Water, etc
> Date: Mon, 06 Mar 2006 15:28:24 -0500
>
>
>[EMAIL PROTECTED] wrote:
>
> David and
At 7:58 PM -0800 3/6/06, Tom Van Baak wrote:
>> of things. But there are places with more water in the air than
>> Boston, as has been pointed out. I think Seattle may qualify from
>> time to time.
>
>There are many ways to measure rainfall but the most
>basic statistic will surprise you: the av
I had to look for that info:
Here we go, this chart
http://www.met.utah.edu/jhorel/html/wx/climate/normrain.html says
Pensacola (40 miles to my west) gets 62 inches annualy.
Surprisingly (to me), the land record (excluding the Pacific islands)
goes to Yakuta, AK with 151"!!!
No GPS controlled t
> of things. But there are places with more water in the air than
> Boston, as has been pointed out. I think Seattle may qualify from
> time to time.
There are many ways to measure rainfall but the most
basic statistic will surprise you: the average annual rainfall
in Seattle is about 36 inches
Na, rain drops in Seattle are usually small, compared to these big
buckets we get down here in Florida :-)
Not unusual to see 3 to 6 inches/hour of rain over a short period of time.
That's the way it feels too if you are out when it happens...
Didier KO4BB
David Forbes wrote:
>Google led me to
I think the problem with rain is not the effect on the direct signal,
which is negligible as your calculation showed, but the effect of
multipath.
Is a rain cloud is nearby, it could reflect signals with significant
strength, causing multiple receptions at your location, with signals
that may
Google led me to a paper written 10 years ago at by some folks at
Lincoln Labs that determined the GPS-rain delay value experimentally.
The paper is at
http://gauss.gge.unb.ca/papers.pdf/ion96am.anthea.pdf
and the results are up to 300 mm of delay to a GPS signal caused by
rain at MIT Haystack
Tom Clark, K3IO (ex W3IWI) wrote:
> David,
>
> Maybe we can figure this out. First, the refractive
> index of water is about 1.3. So I think this means
> the propagation speed of radio waves in water is
> down to about 0.75 c, right?
1.3 is about right in the optical region, but I believe the ef
[EMAIL PROTECTED] wrote:
David and Tom opined:
Rain should have an effect on the timing of the signal, since the
propagation speed of radio waves through water is different from that
through air. It will also attenuate the signal, causing worse S/N
ratio which would cause the lower-eleva
