"gareth" wrote in message
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An interesting poser. I do remember in my final year at Uni in 1972
touching on delay lines fabricated from L & C, ubt have not
encountered the phenomenon for the past 42 years.

That sounds like a VERY long delay line!
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;-)
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73 de Frank Turner-Smith G3VKI - mine's a pint.
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http://turner-smith.co.uk