Hi Fabian! Yes I Xlating and filter the Bw to 100K and then decimating to SampRate 100k to be get a morefine details in the GUI Frequency.
I tested with a second Xlating in parallel and it worked perfect. PS. Is there any mirroring of this list with a WEB gui? /Thanks Phil > Hi Phil, > I read your post like four times and could not figure out what you are > doing and what you are trying to achieve. Where is your target signal > originally located? At fc? Is fc = 100k? Why do you mix 100k down with > the Frequency Xlating FIR and then define a different center frequency > for your Frequency sink? An example graph would be helping. > Nevertheless, it seems like you just want to shift the frequency around > (i.e., mix the signal) and low pass filter it. You can do this as many > times in parallel as you want. And maybe using the Low Pass Filter > component will make things easier, as you don't have to define taps > manually. Mixing can be done with a complex signal source combined with > a multiplier or you use the Frequency Xlating FIR with [1] as taps. Note > that a positive center frequency for the Frequency Xlating FIR will > actually mix the signal down (negative frequency). > > Hope that helps a bit, > Fabian > > Am 08.07.21 um 21:32 schrieb Phil Wiggum: > > I Have this setup > > > > SDR(fc) > > -> 'Frequency Xlating FIR Filter' (Low pass, Center Freq: 100k) > > -> Resampler( 5M/100k) > > -> 'QT GUI Frequency Sink' (Center: fc+100k, Bw 100k) > > And parallel with QT GUI FSink, > > -> 'Log Power FFT' -> Python (Peak detektor) > > > > My problem I have is the read out from 'Log Power FFT' starts at 'fc+100k'. > > I would like it to start 'fc+50k'. > > Can I use 'Frequency Xlating FIR Filter' again and lower my frequency > > starting point? > > > > Like this parallel with QT GUI FSink, > > -> 'Frequency Xlating FIR Filter' (????) > > -> 'Log Power FFT' -> Python (Peak detektor) > > > > What kind on taps do I need if this is possible? > > > > /Phil > >
