Alan,
It won't be splattering, but more of a shadowing or dull glazing, kind
of like gray colored sun glasses. The heating is to cause the sun glass
effect coating the glass bulb to go back into a gas and, when cooled
down it will solidify, pooling into the DIMPLE that should be oriented
in the down position to collect said pooling.
It is a very small amount of Rubidium material grayish silver in color.
The only purple is when heated to the gaseous state it is excited as a
plasma by an external RF signal around 100 MHz.
So, the two big questions are was it heated long enough to cause all the
material to go back in to a gas form and then while cooling it was held
fixed so the DIMPLE was pointed down long enough ? Hopefully you got it
right, otherwise try again is all you can do. Personally, I don't think
60 to 90 seconds would be long enough, but I don't actually know that,
just a feeling. If you got it right, perhaps there are other issues
like part values that have drifted.
Bill....WB6BNQ
Alan Kamrowski II wrote:
Hi,
Well, I had it apart so I went ahead and tried the heating process on the
lamp. I don't see any splattering on the lamp at all of purple material,
but I added some masking tape to the threads and put it in a drill to rotate
it. I hit it with a hot air station at 350 deg C and rotated it for 60-90
seconds or so. The end result is a lamp that went from 3.5V to 3.7V.
Did I do it long enough or hot enough? The repair guide I saw said
something about a hot air gun and those can be 300-600 deg C...
Thanks,
Alan
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