Si5351 WSPR at 144MHz

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Si5351 WSPR at 144MHz

Has anybody got any experience of using a Si5351 directly on 144MHz to generate WSPR signals. Is the noise performance adequate?
I can achieve the necessary frequency accuracy and stability by using a GPS/Rubidium standard and it would be nice if I can generated directly at 144MHz without having to mix and filter.
The project is as a replacement for the simple GB3SSS cw FSK beacon down here at Poldhu.
Cheers Terry