Thursday, January 16, 2014, 9:50:16 AM, you wrote:
> Somewhere in the seventies, in the ARRL handbook, there appeared a 6 meter
> amplifier tuned variometer style with a one turn shorted coil, rotating in
> the stationary tank coil. It wasn't very wideband as I can recall, but it
> worked.
> It seems to me, Chris, that you won't have any qualms about plagiarism: it
> was definitely more than 20 years back!
> Alex 4Z5KS
I have an older ARRL Handbook showing a coil that is compressed and
allowed to re-expand via an internal threaded rod and two (Teflon?)
plates at either end. I have a Russian R-140 tetrode amp that uses
variometers, with complex auto control. Is "permeability tuning" the
correct description of a coil tuned with a none magnetic material
slug? Or is that getting pedantic?
Thanks for the replies.
--
Best regards,
Chris mailto:chris@chriswilson.tv
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