> yes the Henrys used resonant choke filters. This helps explain it:
> http://www.qsl.net/i0jx/supply.html
> There was a nice article in QST in June 1946 about how to get the
> inductance of a "mystery" choke using some math, a multimeter, an AC
> microampere meter, and 120 v. service but since you have 240 you'd
> have to work with one side of that if the UK has neutral return (four
> wire service).
> If you can get access to QST on-line: "How Much Inductance? A simple
> method for measuring unknown filter chokes" by George H. Floyd W6OJK/2
> June 1946 QST p. 69 and 132.
> 73
> Rob
> K5UJ
20/12/2012 19:05
I am an ARRL member (much better than the RSGB...), so have access to
the database. I have printed off the article and done the maths for
50Hz mains. My only concern is whether to put our UK 240V mains across
the choke, or use a Variac and drop it to 115V? I'll probably try it
with a Variac first, then see how much current it draws. Thanks for
the link. I have also found something similar at:
http://dalmura.com.au/projects/THE%20MEASUREMENT%20OF%20CHOKE%20COIL%20INDUCTANCE.pdf
Which is similar, but goes into more depth about the whys and
wherefores. Thanks very much for posting Rob!
--
Best Regards,
Chris Wilson.
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