[ntp:questions] Sure gps looses all sattelite fixes

David J Taylor david-taylor at blueyonder.co.uk.invalid
Sat Feb 25 07:42:06 UTC 2012


"unruh" <unruh at invalid.ca> wrote in message 
news:qfS1r.13334$Pc2.3258 at newsfe13.iad...
> On 2012-02-24, David J Taylor <david-taylor at blueyonder.co.uk.invalid> 
> wrote:
>> "unruh" <unruh at invalid.ca> wrote in message
>> news:cmQ1r.3572$py5.2962 at newsfe09.iad...
>> []
>>> The graphs of the signal strengths at the edges of these dropouts is 
>>> in
>>> ftp://theory.physics.ubc.ca/outgoing/drop{out,in}.pdf
>>
>> Could not access this page in Firefox.
>
> These pages.
> dropout.pdf and dropin.pdf sorry if my use of the  bash syntax confused
> you.

Thanks.

[]
> It has. I plotted the location of the satellites in the sky using S/N
> bands. I can see the whole sky (ie sattelites are tracked across the
> whole sky-- except for a hole in the northern sky where I guess the
> satellites never go as viewed from Vancouver.) There are some trees to
> the east, and they seem to reduce the S/N by about 10dB but they are
> still visible and tracked even through the trees. (Cedars)
[]
> Mine are stuck to the iron flashing around the top of the building--
> about 1/2 a meter wide. But that flashing is not attached to any
> microwave noisy source AFAIK.

The correct URLs are:

  ftp://theory.physics.ubc.ca/outgoing/dropout.pdf
  ftp://theory.physics.ubc.ca/outgoing/dropin.pdf

You should not be seeing a gap like that.  You could get down to a small 
number of satellites, but not none.  What was the duration of the outage?

I did mean to ask whether the receiver board itself was in a well-screened 
box, and the whole assembly properly sealed for outdoor operation.  I take 
it that you have not extended the lead from the antenna puck to the 
receiver board?

My gut reaction is that if the antenna puck is outdoors you should be OK 
(unless you were at ground level and blocked by skyscrapers).  I hope you 
can locate the source of the problem.

Cheers,
David 



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