[R-390] Correction To "Chambers Audio Derived AGC Mod"

John KA1XC [email protected]
Sat, 3 Apr 2004 13:50:33 -0500


----- Original Message ----- 
>  I would be
> interested in the observation of anyone else on absence or presence of
this
> quirk of meter hang

Dan,
I've only seen this in a mechanically defective meter. You could disconnect
it and play around with it on the bench to find out.

>and whether or not the carrier meter is pinned in a set with
> or without the diode mod when switching from slow to med on agc.

The meter pinning is a normal characteristic of stock R-390x's when
switching from the SLOW to either of the other speeds.
Theoretically my guess it the AGC-diode mod would behave the same way, but
in reality the diode junctions may be breaking down to the large negative
pulse generated when the AGC speed is switched.
Might be a good idea to hook up a scope and take a look.

John