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keenerd keenerd at gmail.comOn 10/28/13, Chris Hanson <lightningbolts at gmail.com> wrote: > I am trying to listen to 424.175MHz and I'm using this: > > rtl_fm -p 30 -d 1 -N -o 4 -f 424.175M -s 16k -C|sox -r 16000 -t .raw -e > signed-integer -b 16 -c 1 -V1 - -d That looks correct. > The issue is that I'm > hearing another station 50KHz higher on 424.225Mhz in addition to the > frequency I want. So it looks as if it's not using a 16Khz filter. Am I > doing something wrong or is there an issue with rtl_fm.exe? Thanks It is a minor issue with rtl_fm. The (very fast) downsample filter tends to leak in places. Soon this will be replaced with better filters. There is a better/slower filter that can be enabled with -F. Check your --help and confirm that -F is present and says 'hamming' in the description. -Kyle