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CW_STEREO_FILTER

2017-01-04 06:59  
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CW_STEREO_FILTER
Developed to enhance ability to read CW despite heavy contest traffic or other QRM. Two high-Q filters, one at each end of 400-Hz CW filter in receiver, create separate audio channels to give effect of stereo.Transistors at outputs of channels provide extra current gain for driving low-impedance stereo headphones. CW signal at 800 Hz then appears to comefrom left, 1200-Hz signal from right, and in between frequencies at various azimuth angles. Illusion of direction makes it easier for operator to concentrate on desired signal in presonce of others having slightly different frequencies. L1 and C1 form filter for 1200-Hz channel, while L2 and C2 form 800-Hz filter for other channel.-R. L. Anderson, Stereo-a New Type of CW Filter, 73 Magazine, March 1976, p 48-50.