[Amps] Henry RF generators

[Chris Wilson]

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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