I believe the 9v version of the QMX's T501 is a fairly straight transmission line transformer with a 1:1 turns ratio
using twisted wire for a transmission line.
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The 12v version of T501 needs a 3:2 turns ratio which can't all be done as a transmission line transformer,
so that is supplemented by an additional single wire winding which acts more like a normal transformer.
Which is "really weird".
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Still trying to fully understand it, this seems to be the best explanation I've found yet:
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Jerry, KE7ER
