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#6
November 11th 05, 01:26 AM
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J. Mc Laughlin wrote: Here is the title and author's name: A method for accurate receiver tuning and precise measurement of the carrier frequency of voice-modulated, suppressed-carrier, single-sideband radio signals Day, Lucius Boyden. I do not know where it might be read on the WEB. 73 Mac N8TT -- J. Mc Laughlin; Michigan U.S.A. Home: No hits in the UC library system, unfortunately. jk "J. Mc Laughlin" wrote in message ... Years ago, I was faculty advisor of a thesis containing a viable technique for measuring the carrier of a SSB signal modulated by a human voice when the carrier was nulled. The student's name, as well as I can remember, was Day and his first name was something like Louis. Should be a link to it somewhere. The scheme took advantage of the nature of the human voice. It required one to have the means to inject a carrier (which was measured by conventional means) and to look at the recovered audio on a scope. The old FMT had one measure CW signals. They were great fun. 73 Mac N8TT -- J. Mc Laughlin; Michigan U.S.A. Home: "Richard Clark" wrote in message . .. On Thu, 10 Nov 2005 10:06:56 GMT, ml wrote: I'd love to learn and try it, but didn't see any posted ''instructions''... Participants may utilize either direct or indirect techniques to determine the tone frequency. ''Direct measurements assume a carrier frequency and measure the audio tone frequency directly,'' Silver explains. ''Indirect measurements obtain the transmitted frequency of the tone component at RF, then compute the difference between the published carrier frequency and measured frequency.'' Hi Myles, You don't see instructions because you are supposed to work this out for yourself and then report both your results and HOW YOU DID IT. It should be a slam dunk with a PC sound card being run under an FFT. However, the skill part is tuning the sideband (and then it remains only the skill of reading the frequency setting of your rig - any error is probably going to be there). 73's Richard Clark, KB7QHC |
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