There are two things determining the frequency accuracy
1: The global CONFIG/EXPERT CONFIG/FREQ CORR. This can be set to correct output versus the internal reference. In your case you have a 350 Hz error at 1 GHz, the FREQ CORR is in PPB so set it to 350 (or -350, I never can remember) and that should correct the systematic error which grows bigger with frequency
2: The frequency resolution. The digital PLL's in the tinySA Ultra have a minimum frequency step of roughly 60 Hz.? This can not be reduced.?
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Designer of the tinySA
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