[ARC5] ARC-2: IF Regeneration is a "No"

[Bruce Long]

Light feedback ie regeneration around an active  ie amplifying stage does create a negative impedance but this negative impedance has a real (resistive) and an imaginary ( reactive) component.  It is the reactive component that shifts the filter center frequency.    This is why the suggestion of adding an entirely seperate negative impedance generator using an independent amplifying section not the existing IF amplifier.  I am sure this can be mad to work but might not be worth the trouble.


On Wednesday, April 2, 2014 7:52 PM, David Stinson <arc5 at ix.netcom.com> wrote:
 

----- Original Message ----- 
From: <millerke6f at aol.com>


>I noted the NO to regeneration, but why not.....

As noted in a earlier post, even "light" feedback 
radically changed the bandpass and resonance 
of the IF amplifiers and this effect varies with tuning, 
ruining the fine tracking of the variable IF and RF stages.
This would be OK if the ARC-2 was to be parked on
3885 KC and never move again, but that's not my goal.
"Adjusting" the regeneration while tuning requires 
boogering the front panel for a new control 
and in my world, that is also an automatic "no."
So my list of possible options is getting thin ;-).

TNX DE Dave AB5S


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