[time-nuts] Best GPS 1PPS Accuracy

SAIDJACK at aol.com SAIDJACK at aol.com
Wed Dec 13 19:56:05 EST 2006


Hi guys,
 
slightly off-topic, but has anyone done stability tests with the m12+ or  
M12M when the antenna goes bad in TRAIM-enabled mode (e.g. less than 4 good sats  
being received by i.e. disconnecting the antenna)?
 
I see that the 1PPS output goes away only after about 5 or so  additional 
pulses have been generated, so these 5 pulses are  "free-running".
 
These pulses are somewhat inaccurate, and I am wondering if anyone has done  
a max/min analysis on the errand pulse's offsets?
 
I wonder if the TRAIM limits can be set to say +-50ns effectively to kill  
these pulses and improve overall accuracy?
 
I know lot's of folks run the M12 TRAIM limits at 1us, that seems excessive  
on a receiver that is supposed to do 10ns 1-Sigma, doesen't it? ...
 
Thanks for your feedback,
Said



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