[Boatanchors] WRL (World Radio Labs) Q-Multiplier?

[Jim Wilhite]

I use a model DQ by Central Electronics on my HQ 140X.  I bought 
the receiver from the estate of the original owner and it came 
with the Q-multiplier.

It was designed with variable bandwidth and can be used in either 
peak or null mode.  I like the thing and it works very well. 
Actually a Q-multiplier is a very useful item even today.

73  Jim
W5JO

Glen Zook wrote:
> I notice that the bandwidth was variable.  There was a
> modification for the Heath QF-1 "Q" Multiplier that
> was in the Hints & Kinks column in QST in either the
> late 1950s or early 1960s that changed the "broad"
> position to a "variable" position.  If I remember
> correctly it did not require any additional parts (or
> if it did it was like 1 or 2 resistors).  
> 
> The wiring change moved the control of both the peak
> and null functions to the peak potentiometer.  The
> null potentiometer then controlled the bandwidth.
> 
> I made this modification on the QF-1 that I was using
> on my original Hallicrafters S-85 and it really worked
> quite well.  You could really pull the "skirts" in
> when things got "tough" when receiving CW.  Then you
> could "widen" them out for SSB or AM phone.
> 
> Glen, K9STH
>