Dieter wrote:
I wonder if Tek's factor of 4 rather than the theoretical
factor of 2 is due to problems with high-order filters at high
frequencies? CDs use high order filters, but the frequencies
are much lower.
For the spectrum analyzer and software radio case, perhaps
we could heterodyne those high frequencies down? This could
work for the 'scope also, as long as the signal doesn't have
significant energy below the cutoff frequency.
High speed digital scopes display only continuous signals. They have a
very fast sample and hold circuit to take a sample, but the sample
window sweeps across the display window and they do NOT need a Nyquist
filter to prevent aliasing because the data is directly displayed on the
screen, not reconstructed.
IMHO, high speed digital scopes are expensive for a reason.
OTOH, an audio scope and spectrum analyzer that was within the price
range of an audiophile might have some potential.
--
JRT
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