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

Graham / KE9H ke9h.graham at gmail.com
Sun Nov 20 21:01:31 EST 2016

You need a definition of "Quality" to work with.

One definition might be "does it meet published specs? under what
Another definition might be associated with reliability and ruggedness.
Longevity in outdoor conditions.
Another might be with the antenna supporting your use case.
Another might be with suppression of reflections and spurious signals from
below the horizon.

So, the definition of "Quality" might change drastically with the use case
and from your expectations as to its cost.

If you have a definition of your quality criteria, then this crowd can
probably tell you what to measure and how to analyze the measurement data.

--- Graham


On Sun, Nov 20, 2016 at 4:13 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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