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@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@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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