Hi Pavan, I already answered on the list. But here goes my text again: > Hi Pavan, > 1) > if you really just need one tone, try a sampling rate like 500kS/s, > and transmit a constant. Use the offset tuning capabilities to put the > tone away from the LO leakage, to avoid cancellation. > 2) > Yes. C++ blocks tend to be much much faster. The fact that you're > seeing underruns proves that your PC couldn't keep up with the > sampling rate you used. > > Best regards, > Marcus
On 09.06.2016 19:19, Pavan Yedavalli wrote: > I didn't receive a post acknowledgment, so just sending again! Sorry > for the redundancy, if so. > > ---------- Forwarded message ---------- > From: *Pavan Yedavalli* <psy2...@columbia.edu > <mailto:psy2...@columbia.edu>> > Date: Thu, Jun 9, 2016 at 9:58 AM > Subject: Re: [Discuss-gnuradio] Multiplying the inputs with a > scalar/vector in my own block > To: GNURadio Discussion List <discuss-gnuradio@gnu.org > <mailto:discuss-gnuradio@gnu.org>> > > > Hi Marcus, > > Thanks for getting back to me. This seems to make sense, but I guess > wrt your suggestions for moving forward: > > (1) You said a bit of trial and error would be good. Can I trial and > error with my sample rate? This is the value in the USRP sink block > and on the signal sources, correct (see attachment)? And just to be > clear, this is /sample/ rate, and not /clock/ rate, correct? So, I > should try to reduce that from 1 MHz to something smaller just to see > what would happen? Since my application isn't driven on samples of > data, I don't believe I need a high sampling rate - I just want a > single tone to be transmitted with no data, so I think I'm okay with > the sampling rate being smaller. Is this one approach to take? I guess > I'm not sure how to determine what would be a good sample rate for my > application. Is there a decent rule of thumb? > > (2) Are you suggesting that I do my created block in C++ instead of > Python, and if so, could I still use GRC/python to use the block in > the overarching system? Speed clearly is an issue, but I didn't think > (know?) that my requirements of sample rate was so high. I guess I > will try (1) first and see whether my application functions the way I > want it to with a trial/error of low sample rate, but if it doesn't > and I need to have a high sample rate, then I will move toward > implementing the block in C++. Is that a reasonable approach moving > forward? > > Thank you again for your patience and help. > > -- > Pavan > > > > -- > Pavan > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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