[Amps] Henry RF generators

[gudguyham at aol.com]

Everybody had a Chris Wilson in their school. I did.

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 On Tuesday, December 15, 2020, Chris Wilson <chris at chriswilson.tv> wrote:



Hello  Joe,

 Wednesday, December 16, 2020

 Yes, here in the UK we say Heath Robinson to describe something that is cheaply made, shoddy or sometimes obviously home made. It is not usually used as an offensive description, but more with affection for something amusingly eccentric.

Here's another Henry deck, no tunable inductor, but two "Heath Robinson" variable caps ;) This is a 14 MHz deck, the previous a 27 MHz. There were seemingly several variants, some DID use a vac variable, but I have only seen photos of those. the 27 MHz deck is a 2000D, the 14 MHz one a 3000D. 

Jay, unless you went to school here in the UK, in Cheadle, Cheshire, or in Manchester, no.


Best regards,
 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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