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keenerd keenerd at gmail.comOn 11/14/12, Adam Nielsen <a.nielsen at shikadi.net> wrote: > I think it's because it tunes to an offset, to avoid the centre spike. > The frequency you use on the command line is what is actually decoded. > > I thought this is what the -E option was for, but WBFM reception sounds > really bad when I use -E. Correct on the offset. -E is something else entirely though. When you are working with waterfalls, it is very easy to see the center/carrier and estimate the bandwidth. But usually radio transmitters report their frequency as the lower edge of the spectrum. -E is for tuning this way. So, lets say I have a NBFM transmitter tuned to 80MHz with 12kHz bandwidth. If you look at it on the waterfall, you will see the carrier centered on 80.06MHz. You could tune to it with either -f 80e6 -s 12e3 -E -f 80.06e6 -s 12e3 Both of those do the same thing. -E can save some typing but center tuning is easier if you don't know the bandwidth in advance. With WBFM this all falls apart, because they use 200kHz of bandwidth (stereo and digital modes) but are offset 16kHz from their official frequency. (Because at one point wbfm was mono with 32kHz of bandwidth.) Use -W for wbfm, it takes all that into account. -Kyle http://kmkeen.com