Folks:
If the shapes of the LSB and USB filters are NOT opposite of each
other, the implication is that BOTH are on the SAME SIDEBAND, rather
than being on OPPOSITE sidebands. This can be confirmed by comparing
either the DAC counts or the FREQUENCIES of the BFO. If both sets of
values (DAC _or_ FREQ) are on the SAME side of the filter center
frequency, then they're both on the same sideband, though possibly
not on the same exact frequency.
73,
Tom Hammond N0SS
_________________________
Bill, AA4LR wrote:
The shape of the USB filter ought to be
exactly backwards of LSB, but yours looks the same, heavy on the low
frequencies and tapering off toward the highs. I wonder if your noise
generator has a bias toward low frequencies, or if there's some
frequency-limiting component in your measurement. Do you have the
KDSP2 installed? Did you disable it when you were taking your
measurements?
----------------------------------
Taking audio from the "phones" jack can produce a rolloff much like that as
well, caused by the electrolytics in the circuit. The auxiliary speaker jack
is a better choice.
Ron AC7AC
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