At surplus I picked up a "LTX Corporation OEM 10Mhz Clock Reference", but it looks like the main component (U1) isn't present, along with some capacitors and an inductor down in the corner. Doesn't look desoldered--it looks never-populated. This was supposedly pulled from working equipment, so I'm hoping someone here has a better idea of what exactly this board is, and what it would take to coax a nice accurate 10Mhz reference signal out of it.
A few notes: the AD5PS-1 is a signal splitter (fancy. $30 on Digi-Key in small quantities). Input on pin 1; output on pins 4-8, each of which routes to one of the SMA jacks J1-J5. The 6th SMA J6 is possibly an input. On the picture below, I drew in a trace that is otherwise hidden by the black plastic bezel.
This is definitely a 4-layer board, making it hard to trace everything out.
F1 and F2 are filters, also pretty fancy, Murata BNX002-01. TH1 is maybe a thermistor? but I can't find that part number. The electrolytics are 50V.
U2 is barely marked (perpendicular to J5 and L3) but it looks like one of those RF amplifiers, taking DC power through L3.
Everything here looks reasonably well-made, though without anything to actually produce a 10Mhz signal. How do I go about figuring out what goes in the U1 footprint? OCXO I presume? What model? The corner pins on that footprint form a square of about 33.5mm on a side. Or is this designed to take an input signal through J6 from an external source like a rubidium driver or something exotic?
Any hope for this as a working frequency reference?