I’m trying to go the poor man’s approach to gnuradio with a soundcard
attached to the IF of my receiver. I will mod my receiver with a 10.7MHz
IF-output and feed it into a tayloe-mixer clocked also at 10.7MHz. It
output two 90 deg phase shifted signals at the baseband to the
of my 96kHz-soundcard. Thus, gnuradio should see a 96kHz wide band.
One of my concerns is the high-pass filter in the soundcard’s input
cutting below 10Hz, according to the datasheet. When receiving a signal
exactly a the IF frequency, at least in theory, both I/Q-outputs should
at a constant DC-level which the soundcard can’t read. Is this a real
problem? I mean all of the signals we’d like to receive are modulated at
least some Hz, so it wouldn’t matter? Of course I could always tune the
receiver to some kHz above/below to cope with that. Still, it would be
to use the whole 96kHz range.
Another question: I browsed the source of the soundcard sources/sinks.
seems to be no special complex input module with two channels, is there
easy way to do that with the existing blocks?