> Basically when I take the FFT of the wgn receiver noise, at certain sample > rates (e.g. 5Msps) the spectrum output is roughly flat, while at other rates > (e.g. ~6 Msps), the spectrum takes on a decidedly Gaussian look, where the > magnitude of the first and last bins of the FFT are 5-10 dB below the centre > bins of the FFT. Does anyone know why this is? I've confirmed this behaviour > with the fft_sink2 block. >
You may be seeing the filter profile of the half-band filters in the down converter (or lack there of). When you have odd decimations, there are no half-band filters in the down conversion chain. 100e6/decim = samp_rate > Also, in an unrelated question, is 25Msps the maximum bandwidth of the > host->USRP interface for the N210 without having to modify the firmware? > Matt is adding support for smaller samples, but 25 is near link saturation at 32 bits a sample. -josh _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
