[Boatanchors] Cheap & Easy Selectivity

[Carl]

I think he shot his wad yesterday with one unqualified statement Bob.

Carl
KM1H


----- Original Message ----- 
From: "rbethman" <rbethman at comcast.net>
To: "Boatanchors" <boatanchors at mailman.qth.net>
Cc: <jfor at quik.com>; "Carl" <km1h at jeremy.mv.com>
Sent: Friday, August 21, 2009 3:37 PM
Subject: Re: [Boatanchors] Cheap & Easy Selectivity


> So I suppose that two metal plates separated by a layer of glass doesn't 
> qualify?
>
> Look, a "gimmick" simply became a generic term for a quick and dirty 
> hand-made capacitor.
>
> This has become a matter of semantics in lieu of a discussion of the use. 
> This is no different than the neutralization in Heath rigs of a threaded 
> aluminum rod inside the final cage OR adjacent to the final to act as a 
> capacitor.  They simply did NOT use the term "gimmick".
>
> BTW - most hookup wire in a radio is NOT solid.
> That's what happens when someone whom isn't in the hobby steps in - 
> mis-information!
>
> Bob - N0DGN
>
> J. Forster wrote:
>> The term 'gimmick' is more usually applied to a pair of solid, insulated
>> wire (like hookup or magnet) twisted together fairly tightly. One pair of
>> ends are the capacitor terminals. The other ends are just cut off.
>>
>> The capacitance may be adjusted down by snipping bits off the unconnected
>> ends, or by untwisting a bit.
>>
>> -John
>>
>>> Its also called a "gimmick" capacitor. Its even used in commercial 
>>> radios.
>>>
>>> Carl
>>> KM1H
>>>
>>>> The Handbook say to use a "short wire", attached to the grid, and add a
>>>> small amount of capacitance, creating feedback by bring the loose end 
>>>> in
>>>> near proximity to the plate lead.
>>>>
>>>> This is a paraphrased condensation of the several paragraphs.
>>>>
>>>> Bob - N0DGN
>>>>
>>>> AI2Q wrote:
>>>>
>>>>> Sounds like what a Q-multiplier box does.
>>>>>
>>>>> Vy 73, AI2Q, Alex
>>>>>
>