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I did the PN measurement again. This time both Ref clocks are bettery powered. DRIXO is shielded in a stainless can (a moded teacup). This is probably the best result I can get from it. I also attached the plot for NDK 2520SD 24.576M which I got from DIYINHK. The NDK plot is almost identical to the manufacturer’s claim, so I think my setup should be ok. The DRIXO is good at 1Khz dBc onward, but the close-in is still far from your measurement. May I ask how you ‘shield’ the DUT? I suspect this is probably the cause. Thanks.