Characteristics of HP-IL Transformers?

[Martin Hepperle]

While I am aware of the PIL-Box (In fact I have one) I am also interested in the original coupling of the HP-IL loop via transformers which seems to put the lowest load on the loop.

I would like to know whether someone has ever characterized the transformers (number of windings, wire diameter, inductance, ...). The documents which I have seen, do not specify any details. Unfortunately I do not have a broken one at had to analyze and I do not want to destroy a working sample.

Modern components in similar applications seem to be Ethernet transformers, but these are rather different and obviously only 1:1, no center taps.

Martin