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

Ackermann, John R jra at febo.com
Thu Jul 24 11:54:27 EDT 2014

Tom, I'd forgotten about those tests (time flies!).  I strongly suspect 
that the bulk of the tempco is from the BPF rather than the 
transformers.  I've been recommending against install the filter unless 
its really needed, for this very reason.

I'll try to do some tempco measurements of one of my TADD-1 without the 


On 7/19/2014 9:52 PM, Tom Van Baak wrote:
> Watch out for the tempco of transformers.
> I ran into this with the TADD-1.
> Removing the inductors/transformers improved the tempco by 15x.
> http://www.leapsecond.com/pages/tadd-1/
> /tvb
> ----- Original Message -----
> From: "Attila Kinali" <attila at kinali.ch>
> To: <time-nuts at febo.com>
> Sent: Saturday, July 19, 2014 3:09 PM
> Subject: [time-nuts] Noise and non-linear behaviour of ferrite transformers
>> Hi,
>> I'm currently looking at some way of breaking the ground loop between
>> several systems. The obvious idea would be to use transformers. I would
>> like to have some kind of rule of thumb to guess how much noise such
>> a transformer would add. But unfortunately i cannot find any theory
>> or measurements of this. Does anyone have some pointers to documents
>> on what kind of noise i could expect (type, and strength) and
>> what/how strong the non-linear behaviour of transformers would be?
>> Thanks in advance
>> Attila Kinali
>> PS: although this started as something with a real application in mind,
>> i'm now interested in this as an endavour of its own. So all and any data,
>> theory or rule of thumb would be appreciated
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.

More information about the time-nuts mailing list