[time-nuts] How can I measure GPS Antenna quality?

Chris Albertson albertson.chris at gmail.com
Sun Nov 20 19:48:45 EST 2016

If you run two antenna simultaneously then...

1) they both can't be at the same location and
2) What if the two antenna interfere one with the other.

I think maybe you need to collect data over a long enough period of tine
that wether averages out.   the satellite tracks repeate pretty much exactly

What you might want to know about an antenna is more than just S/N for good
locations but how it does with adverse conditions like multi path and a
nearby jammer and maybe gain vs. elevation and also dumb practical stuff
like if birds like to perch on it and if there is a way to route the cable
through the mast pipe or not

On Sun, Nov 20, 2016 at 2:13 PM, Hal Murray <hmurray at megapathdsl.net> wrote:

> Is that even a sensible question?  Is there a better way to phrase it?
> The problem I'm trying to avoid is that the weather and the satellite
> geometry change over time so I can't just collect data for X hours, switch
> to
> the other antenna or move the antenna to another location, collect more
> data,
> then compare the two chunks of data.
> The best I can think of would be to setup a reference system so I can
> collect
> data from  2 antennas and 2 receivers at the same time.  It would probably
> require some preliminary work to calibrate the receivers.  I think I can do
> that by swapping the antenna cables.
> If I gave you a pile of data, how would you compute a quality number?  Can
> I
> just sum up the S/N slots for each visible/working satellite?
> --
> These are my opinions.  I hate spam.
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Chris Albertson
Redondo Beach, California

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