rtl_fm.exe issue or an I doing something wrong?

Chris Hanson lightningbolts at gmail.com
Mon Oct 28 19:41:01 UTC 2013

I just downloaded the RelWithDebInfo precompiled windows software that was
posted on Oct 24th.  I am using an E4000 dongle which has a PPM of +30.

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

everything is playing fine.  I can hear 424.175MHz.  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

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