Hi Jeon, there's a bit wrong with this: 32kHz is not a valid sampling rate of any USRP that can take basicTX, LFTX or UBX daughterboards, which is what you'd need to produce a baseband signal. Your console window should show a warning saying which sampling rate was actually used. We can deduct which rate was used: 32kHz * 7.8 ~= 250kHz.
Best regards, Marcus On 06/25/2015 03:38 PM, Jeon wrote: > I build a flow graph like an image in the following link: > http://i.imgur.com/PpXck09.jpg > > > > > After then, I connect the USRP and an oscilloscope and see output, > which yields: http://i.imgur.com/JEKhnfx.jpg > > > > As you see, both are square waves, but the frequency, the above is 1k > and the below is 7.8 kHz. > If I set a frequency of signal source to 2k, the below says 16.6 kHz. > (Of course, there are some deviation) > > How could I understand this? > If the oscilloscope shows a frequency slower than the GNU radio, > I think that is acceptable since there are latency and processing time > and something. > > But the output is 7.8 times faster than what I inteded. > The only thing I can guess is... 7.8 is rounded up to 8, and 8 > indicates '8' bits. > But it seems a bit unnatural and weird... > > Could anyone give me a hint? > > If you think it is more appropriate to be posted on USRP-users, I'll > post it there later. :) > > Regards, > Jeon. > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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