Re: Idea for a method of Z measurement.
I don't recall you mentioning what frequency range you wanted.
Homebrewing this sort of thing isn't daunting at all .... It's fun!
It's amazing what you can do that you didn't know you could.
If you want to move a bit of power, without significant loss, then the two transformer hybrid (it's like a bridge, using the source, load and the derector terminations as the arms even though they aren't obviously wired ad a bridge, they work as one.
Wes Heyward put one in one of his books... Experimental Methods, I think
I put one in Sprat isue 61 with a couple of diode detectors and meters, but the hybrid can be used alone. Covers topband to about 50 MHz with good accuracy though people say it's good enough to 2m. The circuit's on the web in various places if you google Stockton Wattmeter. No I didn't choose that name (it's the last one I'd have) Dick Pascoe (Kanga) did that as a play on PW's penchant for naming things after towns.
The day job once included designing some hybrids for measuring balanced loads in the 135 and 600 Ohm region. They went to telecomms PTTs and places like Bell labs. Had to get those dead on, and beat the opposition's bandwidth and null depth ;-)
David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
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