Re: BL2 choking Impedence measurements?

Posted by gm3sek on Aug 28, 2010; 10:14am
URL: http://elecraft.85.s1.nabble.com/BL2-choking-Impedence-measurements-tp4686857p5472356.html

David Cutter wrote:
>I like measuring things in the lab and doing the calculations, so we
>can avoid blowing things up, wasted time and disappointment, but I also
>like to put the thing into practice and do relevant measurements in situ.
>
>I'm building yet another current meter (others have grown legs and
>wondered off somewhere) to "measure" braid current with various chokes.

A clamp-on RF current meter is the *only* way to measure how effectively
a choke is working in the actual installation. It's one of those things
that is so easy to make, and then you wonder where it had been all your
life!  (That is also why borrowed current meters don't come back.)

>
>One thing that interests me is that we never used chokes and baluns "in
>the old days"  circa 50s and 60s - how did we live without them?

I think we lived in ignorance... but also feedline radiation/pickup was
far less important in those days because there was far less electronics
of other kinds.

>Not many beams around my way in those days; I'm more interested in
>keeping noise out of the receiver.
>
These days, that is often the most important reason to use feedline
chokes.


--

73 from Ian GM3SEK
http://www.ifwtech.co.uk/g3sek
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