OK, same unit, all put together.............

Here is a montage of the phase noise, during different phases:

So, what is the purpose of that?
Well...........
Some of them were taken with just the clock powered up, and fed with an external SMPS. Others were with everything operating, and still using the cheap wall wart to power everything. Others are with everything running, and using the internal "leen-yer" PSU. And some are more of that, but with that metal can soldered in place.
What it is supposed to do does not show up in the phase noise plots.At this point, I know some of you are asking
"then why the hell is it in there?"Oh, it is in there for a reason. Only I am not saying. Let's put it this way: as cheap as we are, do you really think we would put a mu-metal can in one of these crappy things if it didn't do something?
"WOW.........................did you just say 'mu-metal'?"Yep, I sure did.
"So, are you going to tell us why mu-metal?"Do you really need to ask?
HELL NO!
Look..................if I did tell you, heads would explode. Damn near everyone (read: audio people who think they know everything about everything audio and everything audio is just audio and none of that RF crap you morons ramble on about means diddly-squat) will tell you it is further proof we are retards.
So............how 'bout this........................
Some brave soul needs to go over to that DIY site that all of us have been kicked off of (some of us more than once, as the person who's name shall not be named plays all kinds of stupid sock puppet games and gets mad when the rest of us are oblivious to his silly antics because none of us are the least bit interested in stupid stuff like that), and tell them we are putting our clocks in mu-metal cans and ask them why the hell we would do something like that.
Go ahead, I dare you!
In fact, I almost beg you. This should be fun.
Of course it could just be so we can screw with their tiny brains, but since we are notoriously cheap...................well, you decide!OK, I am off to the Post Office...............