[time-nuts] Sun Outage
kb8tq at n1k.org
Fri Oct 10 07:21:59 EDT 2014
Bringing this back to GPS…
The TV stuff is at about 8X the frequency of GPS. That makes a difference in terms of things like rain. That said, yes, there probably is some giant rainstorm that would impact GPS accuracy. Much more likely in a “I can only see a small patch of sky” situation.
On Oct 10, 2014, at 1:16 AM, Andy <AI.egrps+tn at gmail.com> wrote:
> Bob Stewart <bob at evoria.net> wrote:
> ... Also, the cartoons I was recording for my granddaughter were
>> unaffected, but the station I was watching had the outage. That doesn't
>> all fit together unless it was the uplink that had the problem.
> I don't think the uplink itself can have this problem.
> But DirecTV uses multiple transponders per satellite, and in some cases
> more than one satellite, so all the channels are not affected equally.
> When I had DirecTV, we had two dishes. The installer boggled up the first
> install so they came back and put up another one several feet away, mounted
> on a more stable surface (not roof shingles). The first dish was one that
> could be used for multiple satellites. It had three 'focal' points with
> three little radomes that either had, or could have, LNAs in them. Each
> points to a different spot in the sky. The second dish had only one.
> Regardless, we received only one satellite.
> I don't recall ever being affected by a solar outage, but rain and ice were
> real killers! Yeah they say rain shouldn't cause an outage, but it does
> when the rain density is high enough. I could use that to predict when we
> were about to be hit by a downpour. There was about a 3 minute lag between
> losing all the channels, and the downpour starting.
> It occurred to me that one could use satellite signals as a meteorological
> instrument to measure the water density in the atmosphere above you. I
> wonder if the NWS does that.
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