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KD9GN kd9gn at lolling.orgOn 11/15/2012 05:13 AM, Adam Nielsen wrote: >> Correct on the offset. -E is something else entirely though. > > Very interesting! Thanks for the explanation. > > I had been wondering whether it was related to the new librtlsdr code > which appears to use a non-zero IF with the E4000 to avoid the centre > spike, so it's good to know what it's really for. > > Cheers, > Adam. > I am not sure if this helps anyone at all but I was playing around with the command line options available with rtl_fm while trying to listen to my favorite local FM Broadcast radio station and had pretty good audio results with this .... rtl_fm -f 88.9e6 -N -s 170e3 -o 4 -A -r 32e3 -l 0 - | play -t raw -r 32k -e signed-integer -b 16 -c 1 -V1 - as you probably already know, when you run rtl_fm without any options you get a list of all of the command line switches as well as some example commands. I couldn't tell much difference between using the -A option or not using it. By the way, I am using an eZcap 668 (E4000/rtl2832u) Hope this helps. 73 - Dave KD9GN