[ARC5] Visual alignment of BC-454

[Kenneth G. Gordon]

On 23 May 2013 at 9:21, Dennis Monticelli wrote:

> Ken,
> 
> That is not jitter because it would then be random.  The double trace
> is an artifact of the triggering for each successive sweep.

That may be so, all right: another explanation is residual hum or audio on the 
signal.

>  In any
> case, the shape of the passband is not in question, that much is
> clear.

Thanks! At least I got something right. ;-)

> 
> The asymmetry within the passband is what I would expect when only one
> IF stage undergoes regeneration while the coupled other half does not.
>  Hard to tell how much overcoupling is going on because of the
> asymmetrical IF gain of the respective coupled stages.

Yes. In fact, when I reduced the regeneration, the display reverted very 
quickly to the single-hump classic shape, but gain was severely reduced. I 
am thinking of temporarily removing the gimmick-capacitor and then 
sweeping it.

>  I wonder how
> much better it would look if both IF stages were regenerated?

Hmmmm.....might not be a bad idea to try.

>  Perhaps
> it would be a prettier passband if less regeneration was applied but
> it was applied equally within each stage.

I'll bet you're right. I may be able to give that a try soon.

Ken W7EKB