> I saw that on eBay, it is great to see a fellow Time Nut won it. I would think > Phase Noise is excellent with the 8663, although I would prefer a version with > discrete SMA's on the outputs.
It's not very quiet, unfortunately, but I'll bet this one would look better if I were to remove it from the board. Note the slight elevation in the noise trace that begins around 500 Hz and continues through 10 Hz, obscuring the usual 1/f corner. That suggests that either the close-in noise is artificially high, or the broadband floor is... or perhaps both. OSA's specifications for the 8662/8663 appear to be unusually conservative. The data sheet calls for -80 dBc/Hz at 1 Hz, and it would be surprising if it were really that noisy, or even close. Another artifact you can see is a small spur that can probably be blamed on the flashing LED. The LED and its associated PCB traces is not far from the DB-9 output jack. I actually thought it seemed to be blinking a little bit faster than 1-pps, and sure enough you can see a small bump around 0.9 Hz. Not a smoking gun but it does look suspicious. -- john
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