[time-nuts] Re: GPS Elevation Mask Values.

[Bob kb8tq]

Hi

Your GPS antenna does not have a clue where signals are coming from. The only
way things get plotted is based on the almanac data. If it sees sat Id 21, it looks in
the almanac for id 21. If the almanac says it’s over India, that’s where it goes on the
resulting plot. 

Best guess: you are seeing intermod of some sort that your receiver interprets as a 
signal from a sat that can’t actually be in view.

Bob

> On Nov 10, 2021, at 9:54 AM, Dan Kemppainen <dan at irtelemetrics.com> wrote:
> 
> Hi,
> 
> So, that finger of signal appearing above the north pole shows up even after the GPS survey is done. Any ideas on how to figure out what's causing that?
> 
> My first thought is to try look at it with a different model of GPS unit.
> 
> Is it possible it could be a signal reflection in the cable or something weird going on in the feed???
> 
> Another thought would be to log the GPS data, to sort out which birds the GPS thinks is up there. Comparing to where they actually are would help sort out what the signal might be bouncing off of.
> 
> Dan
> 
> 
> On 11/9/2021 3:30 AM, time-nuts-request at lists.febo.com wrote:
>> Message: 1
>> Date: Mon, 08 Nov 2021 16:36:49 -0800
>> From: Hal Murray <halmurray+timenuts at sonic.net>
>> What's the blue finger sticking out into the North Pole hole?
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