Hi Ludovico, On Thu, 2019-09-12 at 12:11 -0700, Ludovico Cavedon wrote: > Hi Marcus, > > Thank you for your reply. The Frequency Xlating FIR filter should be > already doing the decimation to being samp_rate down to 48k.
Not really – it does a decimation by a factor of 20, whiche means your 1 MS/s becomes 50 kS/s. > However I found out that formula for the Quadrature Demod gain was > using samp_rate instead of audio_rate (48k) and the gain was > excessively high. > Having fixed that, now it works. > Interesting! If you're not experiencing hiccups after some time (when buffers have run full, because your audio device consumes at 48 kS/s, while your signal processing chain feeds in 2 kS/s more than that), either the RTL dongle or the sound card are lying about their actual rate :) However, you're right, this should be "close enough" to work for short terms, albeit audio frequencies should still be a bit off (by 4%). Best regards, Marcus _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
