[time-nuts] Cable length calibration

[Clint Jay]

Some of the cheap gigabit network cards can and with surprising accuracy
On 29 Jun 2016 22:02, "Gary E. Miller" <gem at rellim.com> wrote:

> Yo Hal!
>
> On Wed, 29 Jun 2016 12:28:50 -0700
> Hal Murray <hmurray at megapathdsl.net> wrote:
>
> > brooke at pacific.net said:
> > > At one point they were looking into making a GPS time receiver
> > > where the cable length calibration would be built-in.
> >
> > How would you do that?
>
> TDR.  The GPS already sends a voltage down the cable to power the
> antenna.  Send a sharp down the cable and see when the reflection comes
> back.
>
> Even some of my cheap managed ethernet switches can do that.
>
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
>         gem at rellim.com  Tel:+1 541 382 8588
>
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