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#7
April 10th 07, 05:11 AM
posted to rec.radio.amateur.equipment
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What does a Q Multiplier do?
pltrgyst ) writes:
On 9 Apr 2007 18:53:01 GMT, (Michael Black) wrote: A Q-multiplier is a regenerative stage. It's prime was in the days of the 455KHz IF, where the improved selectivity would actually make a difference. At a higher frequency, it would still increase the selectivity of the tuned circuit, but not enough to narrow the passband for voice or CW. So what about audio Q-multipliers? Do they function on the same principle? -- Larry Originally yes, though I've seen "audio Q-multipliers" described in construction articles that are more strictly average audio filters. They may even come out of the same place. The selectoject was described in QST in the late forties, by O. G. Villard, and it uses the principle of regneration to get better selectivity at audio. And O. G. Villard is the name I'd associate with the use of the Q-Multiplier for better reception of AM (there are references to a QST article by him on that topic in an early ARRL SSB manual). But I've never seen a specific link between the selectoject and the Q-Multiplier at the IF of a receiver, so I don't know if he came up with the IF Q-multiplier as we know it, or someone else did. Certainly O. G. Villard, who died only three years ago, came up with quite a few things important to amateur radio, including a lot of work in SSB in the early days. Michael VE2BVW |
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