Walter,
thanks for the pointer. Will give it a try. Not sure how to combine the
two, lets see.
73 Gernot
Am 04.02.2020 um 23:52 schrieb Walter Underwood:
You actually have 22 kHz of in-phase signal and 22 kHz of quadrature signal
on the stereo output. You can combine those to get 44 kHz of bandwidth.
More info here:
https://en.wikipedia.org/wiki/In-phase_and_quadrature_components
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
On Feb 4, 2020, at 2:45 PM, [email protected] wrote:
Hello,
for a long time I just haven't looked into the details, but now I did
and I'am confused.
When I plug it into a soundcard it appears to show the current station
in the center of the display, to my understanding the center of the
display is the half of the sampling frequency of the sound card.
This ist at least confirmed in the manual pg. 26 (Rev C5).
When I sample the I/Q signal by myself, the same signal appears at the
lower end of my spectrum.
Now it looks like I'm not getting the full bandwidth sampled? With fs of
44.1kHz I can only see 22kHz of bandwidth after FFT.
So, according to many articles I read about FFT, the resulting bandwidth
is always fs/2. So how can we see 44kHz of spectrum on a 44kHz sound
card? I'm confused...
73 Gernot DF5RF
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