David L. Thompson
thompson at mindspring.com
Mon Nov 26 12:54:59 EST 2001
The Q-multiplier allowed better selectivity (most also had a notch) for
older receivers. I had a Heath Q-Multiplier with my first RX the S-40B.
Unfortunately the S-40B needed more help than a Q-multiplier. My second RX
had a Q-Mult built in. The DSP and pass band filters are the modern
Q-Mult. My Yaesu has a notch filter and sharp audio filter...and this one
does not always notch out the desired sig too!
73 Dave K4JRB
> The current poor conditions for the contest led me to do some
> research into ancient history. 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.
> Obviously this would be of great value for modern contesting in
> poor conditions when the Q-rate can be as low as 10 per hour. A
> Q-multipler of even a small value such as 5 would make this into
> 50 per hour.
> It seems reasonable that a modern contesting program could easily
> have this feature added - the programmer already has an IF
> statement - just a little more work should result in a software
> based Q-multiplier.
> tony (ve6yp :-)
CQ-Contest on WWW: http://lists.contesting.com/_cq-contest/
Administrative requests: cq-contest-REQUEST at contesting.com
More information about the CQ-Contest