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)
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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