[TenTec] Measuring High Impedances

[Jim Brown K9YC]

Jerry,

If you haven't already done so, have a look at the measurement 
issues that I've raised in the Power Point file below. 

http://audiosystemsgroup.com/NCDXACoaxChokesPPT.pdf

Then take a look at 

http://audiosystemsgroup.com/Toroid61Data-2.pdf

Virtually any reflection-based measurement (i.e., S11) will 
give you VERY wrong answers for those chokes wound on #61 (and 
also for the higher frequency coax chokes on #31 cores). It IS 
practical to get good data using S21 (i.e., as the series 
element of a voltage divider. 

The Q-meter is fine instrument, but not many folks still have 
one or know how to use one. As the Power Point shows, my 
voltage divider technique is able to get pretty good data for 
some pretty high Z parts with instrumentation of modest cost.

73,

Jim K9YC