Attila you do not need triax cable, a good coax will do the job, but
open shield is always a source of trouble, just imagine there is a vey
good coupled line -- which at certain frequency is n times the 1/4
wave length.....
cat 5 or cat 6 you get what you pay for .. it was never made for
precisions application
73
Alex
On 7/20/2014 9:16 AM, Attila Kinali wrote:
Moin,
On Sun, 20 Jul 2014 03:41:44 -0700
"John Miles" <j...@miles.io> wrote:
I often find that when I use coaxial baluns to cut down on ground loop
noise, I end up with more noise and interference than I started with. Not
always, but often enough that I'm leery of them.
[...]
Thanks for the explanation. Now everything makes a lot more sense!
If i understood you correctly, then the right thing to do would be
either to use triax (single core, two isolated shields) with the inner
shield as the ground point for the balun, while the outer shield is
connected to the transformers shield or left open. Or alternativelly
use some differntial, shielded cable.
Apropos: does anyone know how "good" Cat5e/Cat6 cable is for timing
applications? Ie, how large is the phase shift on bending or temperature
and humidity change?
Attila Kinali
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