[CQ-Contest] Q-multiplier

Bill Turner w7ti at dslextreme.com
Mon Nov 26 06:29:12 EST 2001

On Sat, 24 Nov 2001 10:43:20 -0700, tony field wrote:

>In the 1950's, the ham radio
>operators had some special technology called a Q-MULTIPLIER that
>could pull signals out of the qrm/qrn. It was usually employed in
>the IF stages of their equipment.


I used a Q-multiplier for a while back in the '50s and '60s, and it
worked pretty well on CW.  The only problem was it created a sharp,
narrow peak in the bandpass but didn't have very sharp skirts.  It was
regarded as a "poor man's crystal filter".  A modern DSP system is much
better - flat across the top and very steep skirts.

A nice piece of history, though.

73, Bill W7TI

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