Richard (Rick) Karlquist
richard at karlquist.com
Sun May 23 12:54:59 PDT 2010
I meant to say "S21" not "S22"
Richard (Rick) Karlquist wrote:
> Let me greatly simplify this discussion.
> Get a TWO port network analyzer and connect
> the DUT from the center conductor of port 1
> to the center conductor of port 2. Measure
> S22 and calculate the impedance of the DUT.
> This eliminates most of the well known gotcha's
> associated with measuring high impedances.
> You should be able to measure even 50,000
> ohms with no trouble.
> If you just want to know the magnitude of the
> impedance, you can fake a network analyzer
> by using a signal generator and a receiver.
> Just measure insertion loss of the balun.
> Only works for floating DUT's but that includes
> baluns. It also doesn't matter much if the
> terminals are far apart physically.
> Rick N6RK
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> TowerTalk at contesting.com
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