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
filter.
John
----
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" <[email protected]>
To: <[email protected]>
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
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