There is a phase-noise chart on the product datasheet:
https://www.ettus.com/content/files/USRP_N310_Datasheet.pdf It doesn't indicate whether this is with the on-board TCXO, or the GPSDO. Thanks, I'll assume the 10 MHz reference phase noise is around -143 dBc/Hz @ 10 kHz. The X300 uses a Jackson Labs OXCO which is -145 dBc/Hz @ 10 kHz. Maybe they will use the same one. Lou
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