On Sun, 2 Sep 2007 05:25:36 +0100, " Peter"
wrote:

|Amplitude Modulation... The output level "swings" above
|and below the carrier level.
|
|Get it yet?
|
|If the output level does not swing, then you have a constant
|amplitude... no amplitude modulation.
|No amplitude modulation = no audio. Unless, of course,
|you are using FM.
|----------------

Wrong

Unless you are using a peak reading wattmeter the power remians
constant with modulation in a DSB-AM Large Carrier signal. IF you were
to do a Fourier Transform of the AM signal under modulatioin you will
see a carrier frequency, the upper sideband frequencies, and the lower
sideband frequencies. The power in the upper and lower sidebands vary
with the power of the modulating signal. With an averaging wattmeter
you should see little or no movement of the power.

james