On 04/02/2011 06:53 PM, Magnus Danielson wrote:
Hi!
Yesterday I managed to trim away the unwanted RF from the 5 MHz output.
I fail to get as good result from the 10 MHz output, but I think it will
not be as big impact. Will possibly need to handle that. Spectrum
analyzer helps a lot more than a scope. Happy I invested in a faster
analog scope.
It is not a stable lock, even if I can se it lock in. I see too much
noise in it and the status flickers so I think I can blame the lamp
detection, need to check that. Possibly I will have to do the lamp
rejuvination trick. Also I need to figure out how to do the disassembly,
since I am not yet clear on how to best reach every part.
OK. Once I figured out how the side-plate slided off I was able to
unscrew the rubidium physical package from the Aluminium frame.
It opens up somewhat like a russian doll and it is clear that it is a
combination of magnetic shielding and thermal isolation in layers. In
fact, it seems not to draw a lot of current. Once I got sufficiently far
in I was able to pull out the rubidium lamp assembly. It's a huge thing,
by far the largest rubidium set up I've seen so far with the Rubidium
lamp being a double cavity thing creating a 1 cm long and maybe 4 mm
wide rubidium discharge then being reflected by a copper reflector to
form a 35 mm wide optical path through the other two glass assemblies.
The lamp lits up and it is not that bad, but I need to think. There are
many possible causes for a bad 2nd harmonic response, and rubidium lamp
may be just one possible problem.
Time for bed.
Oh, I *did* try to get the camera. I discovered it badly needed the
battery to recharge, so it is charging it now.
Cheers,
Magnus
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