[time-nuts] Rooftop antenna and splitter

[Bob kb8tq]

Hi

There normally is a “survey in” process on a GPSDO. The location then gets used to
help out the timing solution. If you move the antennas “far enough” (how far very much depends
on the design) the device goes back into survey mode. While doing that, the timing
may be less than ideal.

Bob

> On Apr 30, 2019, at 3:34 AM, David J Taylor via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Denny,
> 
> That is certainly a large difference.  But I'm not clear on one point that could easily be very important:
> 
> Were the two antennas for the separate antenna test indoors, or on the roof? If indoor, I kind of suspect that the difference might mostly be attributed to the change in antenna locations more than anything else.  If this is what's going on, you've made very strong case for outdoor antennas for GPS timing.
> 
> Also, it's possible that the two receivers with their antennas in such close proximity might have been interfering with each other.
> 
> Dana
> =====================================
> 
> Agreed with Dana's comments on the antennas.  If indoors the signal strength would be much less.  Did you have a ground plane for the puck antennas?  I went through a couple of iterations:
> 
> https://www.satsignal.eu/ntp/2013-03-31-1226-32-GPS-antenna-farm.jpg
> 
> https://www.satsignal.eu/ntp/2019-01-08-1330-23b-GPS-antenna-farm.jpg
> 
> and I have a simple outdoor L1 antenna & splitter too.
> 
> Cheers,
> David
> -- 
> SatSignal Software - Quality software for you
> Web: http://www.satsignal.eu
> Email: david-taylor at blueyonder.co.uk
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> 
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