[Boatanchors] Cheap & Easy Selectivity

[Carl]

Its also called a "gimmick" capacitor. Its even used in commercial radios.

Carl
KM1H


----- Original Message ----- 
From: "rbethman" <rbethman at comcast.net>
To: "Boatanchors" <boatanchors at mailman.qth.net>
Cc: "AI2Q" <ai2q at roadrunner.com>
Sent: Thursday, August 20, 2009 2:51 PM
Subject: Re: [Boatanchors] Cheap & Easy Selectivity


> 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
>>
>> ----- Original Message ----- From: "rbethman" <rbethman at comcast.net>
>> To: "Boatanchors" <boatanchors at mailman.qth.net>
>> Sent: Thursday, August 20, 2009 2:19 PM
>> Subject: Re: [Boatanchors] Cheap & Easy Selectivity
>>> The 1948 ARRL handbook hits it in Chap 5,  High Frequency Receivers,
>>> Improving Receiver Selectivity, IF Amplifiers, then under a minor
>>> heading:  Regeneraton.  pp115-116.
>>>
>>> This is essentially ADDING Regen to a Superhet.
>>>
>>> Bob - N0DGN
> 
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