I have an N320 that I'm trying out for the first time. I'm using UHD
4.0.0, and I loaded the corresponding root filesystem data for that
release to the N320. I find that when the receiver is tuned to
frequencies below 450 MHz, the spectrum is inverted. When you tune to
450 MHz or above, the spectrum is upright as expected. See the attached
screenshots for example spectral plots.
There are several ATSC signals visible in the spectrum. I simply used an
indoor antenna, so there is a lot of multipath on the signals causing
their spectra to be very non-flat, but the telltale sign of spectral
inversion here is where the pilot tone is appearing on each one. In the
first plot, tuned to 440 MHz, they appear on the right of each signal;
this is not where they should be. When you tune to 450 MHz, the location
of the signals flip to the right half of the plot, and the pilot tone is
on the left, where they belong.
Is this a known issue?
Thank you.
Jason
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