[time-nuts] GPS fade out, Sat/Sun

Hal Murray hmurray at megapathdsl.net
Thu Feb 16 08:20:56 UTC 2012

Here is a graph to follow up that event.

The green/red lines on the bottom are the good/bad results from the GPRMC 
sentence each second.

The blue/purple lines on top are the number of satellites.  "good" means it 
had a number in the SNR slot vs empty for "bad".

The unit is inside my house.  I'm in Menlo Park, 94025, the fringe of Silicon 
Valley.  There is probably lots of multi-path from my neighbors house and 
lots of attenuation from the big tree out front/south-east.

The good slots are plotted slightly above the nominal line and the bad are 
slightly below so they are both visible if they would land on top of each 

I can provide the raw data if anybody wants to investigate more.

Does anybody know if the FCC wants data like this and if so do you have a 

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