[time-nuts] Noise and non-linear behaviour of ferrite transformers

Alex Pummer alex at pcscons.com
Sun Jul 20 14:33:22 EDT 2014



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" <john at 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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