[time-nuts] Cable length calibration

Gary E. Miller gem at rellim.com
Wed Jun 29 22:15:28 UTC 2016


Yo Poul-Henning!

On Wed, 29 Jun 2016 20:18:49 +0000
"Poul-Henning Kamp" <phk at phk.freebsd.dk> wrote:

> >How would you do that?  
> 
> TDR ?
> 
> If it wasn't behind a choke, the inrush current to the antenna
> preamp power filtering capacitor could be measured, but the choke
> ruins that.
> 
> The trouble is how to do it without frying the antenna preamp...

The TDR would only put the same voltage on the cable that it already
does.  So nothing gets fried.  If you are worried about the antenna,
disconnect it before doing the TDR.

It works on live ethernet cables, so it can't be too harsh.

A real good TDR can shouw you every tight bend in a cable.

Or buy a tape measure.

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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