On Wed, Sep 8, 2010 at 02:16, jimlux <[email protected]> wrote: > Mark J. Blair wrote: >> On Sep 7, 2010, at 6:30 AM, jimlux wrote:
> Yes.. except that the cable's physical and electrical length *do* vary with > temperature, so if you're looking at the gnat's eyelash sort of thing, you > need to take that into account. Maybe 10 ppm/degree, so a 20 meter run will > change a bit less than a millimeter. That's down in the fractional > picoseconds time-wise. > > It's an issue if you're doing things like interferometry at higher > frequencies.. Would be possible for the receiver to take into account automatically the delay of the antenna cable, by measuring the delay of an echo of a signal it sends towards the antenna? Do such receivers exists? _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
