Dear Corby,
Corby Dawson wrote:
Bill,
The receiver unit is not sealed.
To remove the lamp assy. you remove the two nuts (one inside) and the 3
shields from the central threaded rod that protrudes from the lamp end.
Then remove the tiny phillips head screws (3) around the circumference of
the lamp assy.
Wiggle a bit and pull straight out.
If you look thru the honey-combed end you will see the bulb.
NOTE! when you reassemble the unit the two nuts must be positioned so
that they clamp tightly against the last shield cap! It is the heat sink
for the lamp assy!
Also as to the bulb appearance. A clear bulb can indeed be bad and a
discolored bulb can be good!
If enough rubidium gets absorbed into the bulb envelope there won't be
enough left for proper operation. Bulb can be clear or discolored if this
happens.
Also the photo-I indication does not always reflect a bad bulb.
The photocell responds to all the light from the bulb, but the operation
of the standard only needs a good output at a very specific frequency
(7800 angstroms).
So if the wideband light output is down but the 7800A is good the photo-I
is low but the RX output is still good!
Good point. It makes perfect sense. Thanks for taking the effort to
share your experience.
Best Regards,
Magnus
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