I’m working on a project that requires using two receivers tuned the
same frequency simultaneously. Ideally, I would use identical receivers,
but I am using a TVRX card and a DBSRX card becuase those are what I
I’m curious why the spectra of signals received with the TVRX seem to be
more spread out than with the DBSRX. An example is shown in the link
below. The upper plot is from the TVRX, and the lower plot is from the
DBSRX. This signal happens to be an ATSC carrier. Both daughtercards are
tuned the same frequency, and the FFT parameters and so forth are
Does anyone know what causes this apparent spreading and if there is
anything I can do about it?
I purposely left out details of my configuration to keep this message
short, but feel free to ask for more information if this isn’t enough to
answer my question.