[time-nuts] How phase stable is rg59 or alternate coax

Scott Stobbe scott.j.stobbe at gmail.com
Mon Nov 21 09:38:21 EST 2016

If you had 30 ft of rg59 outdoors seeing maybe 10 degC swings everyday,
would the propagation time be stable to ps? ns?

On Sun, Nov 20, 2016 at 7:04 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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