On 29/01/2023 22:26, DAVID ABEL wrote:
I have a B200mini. As a test of spectral purity, I generated a CW
signal at 175.0025 MHz using Gnuradio, I see spurs at +/- 132.5 kHz,
at -50 dBc; with offsets of 265 kHz at -60 dBc; and another at 702.5
Khzat -60 dBc.
Is this expected behavior for the B200 mini, please?
Some further detail: the Gnuradio flowgraph is a signal source
generating a sine waveform at 2500 Hz, followed by a lowpass filter.
The USRP sink has a frequency of 175 MHz with an LO offset of 15 MHz.
Sample rate is 384 kHz. The spurs are present on other carrier
frequencies with the same offsets.
Thanks
Dave Abel VK1DJA
That's almost certainly "in spec" for the AD9363 chip that does all the
"heavy lifting" on the RF side of things.
Does the baseband amplitude affect your observed spur performance? That
is, if your signal source has an
amplitude that is somewhat-less than 1.0 (like 0.85) do the spurs
reduce correspondingly?
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