28 May
2010
28 May
'10
8:07 p.m.
On Fri, 28 May 2010, Ralf Mardorf wrote:
On card A or X?
X. A has already been "proven" -- unless it's a trick
question that we can't trust that "proof."
The 100 Hz (being 2x 50Hz, the power freq. in Italy)
suggests that it is probably related to some manner of
power supply. However, I have no theory why we're
getting 2x 50Hz (and I think I need one :-)).
Doh! When the AC wave is rectified, it results in a signal that is 2x
the freq. because the negative part gets inverted. That's why we see
100 Hz instead of 50 Hz.
-gabriel
Why AM and not additive signals?
Because the peaks shift with the input signal. If the
signals were just added (mixed) then the peaks would always
be at 100Hz, 200Hz, 300Hz... etc. and have the same
amplitude.
Try modelling it up with AMS (that's what I did).
-gabriel