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

Bob Camp kb8tq at n1k.org
Sun Jul 20 12:52:06 EDT 2014


Hi

The simple way to take care of the coax shield issue is to use a common mode choke. 

Bob

On Jul 20, 2014, at 12:16 PM, Attila Kinali <attila at kinali.ch> 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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