[time-nuts] What position is measured?
olopierpa at gmail.com
Wed Sep 8 10:35:36 UTC 2010
On Wed, Sep 8, 2010 at 02:16, jimlux <jimlux at earthlink.net> 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
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?
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