Wednesday, May 15, 2024

USRP B210 Frequency Offset

I've encountered a consistent frequency offset of around 2ppm with my new B210. Operating at a sample rate of 4 MSPS with the "internal" clock, all calibrations were performed using a sine wave from an Agilent signal generator.

Though seemingly minor, the 800Hz offset at UHF poses challenges in receiving low-rate data from orbiting satellites. Is there an automated method to approximate and mitigate this offset? Currently, I manually adjust the frequency by subtracting the offset in ppm. However, I'm curious if there are more sophisticated solutions available, excluding reliance on GPS or a 10MHz reference.

Best regards,
Moses


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