[time-nuts] 1PPS users?

Bob Camp kb8tq at n1k.org
Mon Dec 19 13:21:10 EST 2016


Hi


> On Dec 19, 2016, at 11:55 AM, David J Taylor <david-taylor at blueyonder.co.uk> wrote:
> 
> From: jimlux
> 
> And pretty much any of these will ingest a 1pps + message, rather than,
> say, a 10 MHz reference.
> 
> Why not just use the raw GPS 1pps (which is typically good to a few tens
> of ns)?  GPS coverage/outage and random variation in the GPS 1pps
> 
> A lot of them use a disciplined oscillator to generate the 1pps, so the
> oscillator is essentially a long term averager/low pass filter on the
> raw GPS output -
> =====================================
> 
> Having the GPSDO/PPS is handy when someone parks outside your location and carries a GPS jammer.

Unless the jammer causes the GPS receiver to go a bit nuts and the GPSDO is dumb enough to 
follow it. Don’t ask how I know about this particular situation :)

Bob

> 
> Cheers,
> David
> -- 
> SatSignal Software - Quality software written to your requirements
> Web: http://www.satsignal.eu
> Email: david-taylor at blueyonder.co.uk
> Twitter: @gm8arv 
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