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#17
October 24th 03, 12:04 AM
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In article , W7TI
writes: On 22 Oct 2003 20:21:16 GMT, (Avery Fineman) wrote: (there are still some long-timers who refuse to accept that the carrier RF energy doesn't change in AM at less than 100% modulation, heh heh) _________________________________________________ ________ I still remember the first time I got hold of a really narrowband receiver and tuned in only the carrier of an AM signal. I was astonished. That was the most enlightening two or three seconds in my whole radio career. :-) Roger that! :-) The first time I had to really calibrate an FM deviation indicator, I had to use the "carrier null" technique with a narrow-bandpass detector (actually a spectrum analyzer). Say WHAT?!? I thought. The carrier amplitude goes to ZERO?!? Impossible, I thought, "everyone knows" that an FM carrier "swings from side to side." :-) Not long after that I got deep into modulation theory and discovered the how and why of that. Mind-blowing at the time, but it explained what was going on. It's a situation where one has to look at either frequency domain or time domain very hard in order to realize how the two are related. Len Anderson retired (from regular hours) electronic engineer person |
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