There used to be a chart on the side of the Heath cantena that showed the
difference between transformer oil and mineral oil as far as power/time. As
I remember it was rather a significant difference.
73
Gary K4FMX
The MFJ product has the same curve and yes, it shows as well a significant
derating between the two at full power (1 KW) - seconds vs 10 minutes. I don't
know if there is a significant difference in molecular weight between the two
which would be the main determinant in temperature rise, though I am quite sure
that at the margins the transformer oil has much better overall characteristics
like flash and smoke points.
However, I'd NEVER run a KW into Cantenna for 10 continuous minutes regardless
of the fluid medium! It gets uncomfortably warm after only a minute or two of
intermittent use and the idea of a flimsy paint can being the only thing
between a gallon of boiling hot oil and me is not comforting.....and I'm a risk
taker!
Al
AB2ZY
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