Itsu,
Sorry for not replying sooner. From your latest work I think we can conclude that Graham's 14MHz anomaly was an artifact associated with his quite complex measurement set up. I am trying to figure out what to do next with this thread. Clearly there is a propagation delay from pri to sec that we should be able to use somehow, and keep to frequencies where the core is effective (like 1 to 2MHz as stated in the 3F4 data sheet).
Smudge
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