[Amps] Henry RF generators

[Jay Sturtevant]

Chris,

Sorry, but I had a physics class lab partner many years ago named Chris
Wilson. Chris was a genius, I was not!
He frequently referred yo my set-up of the experiments as a Heath Robinson!
He helped me the entire year!

Jay, K2ZT

On Tue, Dec 15, 2020, 8:07 PM Chris Wilson <chris at chriswilson.tv> wrote:

>
>
> Hello Amps,
>
>  Wednesday, December 16, 2020
>
>  Oops, forgot the link to the 3000D 14 MHz deck , sorry. See below please.
>
> http://www.chriswilson.tv/deck2.jpg
>
>
> Best regards,
>  Chris    2E0ILY       mailto:chris at chriswilson.tv
>
>
>
>
> CW> Hello  Joe,
>
> CW>  Wednesday, December 16, 2020
>
> CW>  Yes, here in the UK we say Heath Robinson to describe something
> CW> that is cheaply made, shoddy or sometimes obviously home made. It
> CW> is not usually used as an offensive description, but more with
> CW> affection for something amusingly eccentric.
>
> CW> Here's another Henry deck, no tunable inductor, but two "Heath
> CW> Robinson" variable caps ;) This is a 14 MHz deck, the previous a
> CW> 27 MHz. There were seemingly several variants, some DID use a vac
> CW> variable, but I have only seen photos of those. the 27 MHz deck is
> CW> a 2000D, the 14 MHz one a 3000D.
>
> CW> Jay, unless you went to school here in the UK, in Cheadle, Cheshire,
> or in Manchester, no.
>
>
> CW> Best regards,
> CW>  Chris    2E0ILY       mailto:chris at chriswilson.tv
>
>
>
> JSW>> Heath Robinson is the British Rube Goldberg (or vice versa).
> JSW>> <https://en.wikipedia.org/wiki/W._Heath_Robinson>
>
> JSW>> 73,
>
> JSW>>     ... Joe, W4TV
>
>
> JSW>> On 2020-12-15 6:44 PM, Mark - N5OT wrote:
> >>> Wait.
>
> >>> Who is Heath Robinson?
>
> >>> Famous kit maker?
>
> >>> Inquiring minds want to know.
>
> >>> 73 - Mark N5OT
>
>
> >>> On 12/15/2020 5:34 PM, Chris Wilson wrote:
>
> >>>>    15/12/2020 23:23
>
> >>>> Many Henry RF generators on 27 or 14 MHz use a brass (?) slug within
> a
> >>>> copper tube coil for inductance changing (as the turns counter
> >>>> advances the slug within the coil the inductance reduces) and a
> rather
> >>>> Heath Robinson variable capacitor using two brass  plates, with a
> >>>> Teflon insulation sheet between them. Now I realize they were not
> >>>> intended to be frequency agile, so my question is, is there an
> >>>> advantage to changing the strange looking variable cap for a vacuum
> >>>> variable? Is the consensus of opinion that slug tuning the inductor
> is
> >>>> fine and can be left as is? Thanks.
>
> >>>> An example Henry RF deck is at http://www.chriswilson.tv/deck.jpg
>
>
> >>> _______________________________________________
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>
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