Re: BL2 choking Impedence measurements?
Posted by
Jim Brown-10 on
Aug 25, 2010; 7:55pm
URL: http://elecraft.85.s1.nabble.com/BL2-choking-Impedence-measurements-tp4686857p5462856.html
On Wed, 25 Aug 2010 11:19:15 -0700 (PDT), Dennis KB7ST wrote:
>I have the AIM 4170 antenna analyzer ( w5big.com ). I could sweep the balun
>in 1:1 and 4:1 mode is you'd like. I'm not sure it will give you the
>choking impedance but will do some checking with the designer of the AIM.
I don't own an AIM, but I've seen choke measurements made by an AIM that had
serious errors. A good common mode choke should have a high resistive
impedance at the frequencies where it is used, and the AIM is best suited for
measuring impedances relatively close to 50 ohms (that is, within 1:5 or
5:1). It's fundamentally unsuitable for measuring the high impedances of a
good choke.
73, Jim Brown K9YC
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