Snehasish Kar has shared a OneDrive file with you. To view it, click the link below. <https://1drv.ms/u/s!Ar2IfAyw5vH1gQ1d_w2fUe4IbyWP> [https://r1.res.office365.com/owa/prem/images/dc-generic_20.png]<https://1drv.ms/u/s!Ar2IfAyw5vH1gQ1d_w2fUe4IbyWP> fract_dec_filter.edf<https://1drv.ms/u/s!Ar2IfAyw5vH1gQ1d_w2fUe4IbyWP>
Hello > 25msps and tried dividing it into 16 channels. I should have returned > 625kspsx2 sample rate each channel >Based on your screen shot I'm guessing you started with 10 Msps and used 16 >channels to get 625 kHz channel spacing (with 1250 ksps per channel). Is that >correct? Yes. > But you can see the snaphshots, if a tune into 955.4MHz and try to get a > channel on index 0 ie the center freq, it works well and I am able to decode > GSM Burst from it. But if I try to add index 2(which is 955.8MHz), the > amplitude in the spectrum falls and also I am not able to decode any GSM burst >Is it correct that your "index 2" center frequency is targetting 400 kHz >offset from the center frequency? If so, I dont expect this would work. Using >a channel spacing of 625 kHz, the >closest channel you could receive next to >955.4 MHz would be 956.025 MHz. Based on your screenshot it actually seems >like the peak energy you're looking for may be lower than the >channel >frequency by about 200 kHz? No. The reason we found for the low energy was that the center of the channel was getting shifted by 100KHz, which we corrected using the frequency Xlating fir filter in gnuradio and also by changing the input sample rate. @EJ Kreinar<mailto:ejkrei...@gmail.com>: thanks for the support. @Jonathon Pendlum<mailto:jonathon.pend...@ettus.com>: I was able to re-create the EDIF file for the fractional downsampler in https://github.com/SynchronousLabs/rfnoc-SynchronousLabs and was able to build it. Though I believe I need to update the rfnoc API for the same. I have the attached EDIF file for your reference. Please guide me if only modifying the noc file work or we any other changes are to be made as per the new rfnoc version. Regards Snehasish
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