[time-nuts] R&S XSRM Rubidium
paulswedb at gmail.com
Sun Jan 23 01:54:23 UTC 2011
Hello to the group.
Indeed I did try the light several times and it does seem to ignite the RB.
But not always.
So thats an area to look at. I seemed to remember neon bulbs could be
triggered. I suppose thats was why I did it for the heck of it.
However Magnus has confirmed that my little silver blob is the RB.
I did try heating the region with a soldering iron at 700 degrees 1/4" away,
but no real difference actually. Have attempted to get the ampule out of the
housing but thats not going to happen. Its held in by a silicone rubber and
though I can dig a bit out its not budging.
Other issue if I do get it out were do you find hi temp silicone to glue it
Might think an automotive store.
Did break the mica cover glass no effect on operation but I will bet its
purpose was not as a filter but simply to stabilize temp in the lamp area.
So I might have a microscope cover slide some place. I doubt its high temp
glass. Who knows.
So definitely experimenting/learning. Have tested the RB lamp several times
to make sure I haven't buggered it.
Who knew dead Rb references could be so much fun. Now if I see them at flea
markets I can pay a buck and have all kinds of winter projects.
On Sat, Jan 22, 2011 at 7:11 PM, Magnus Danielson <
magnus at rubidium.dyndns.org> wrote:
> On 01/22/2011 11:31 PM, paul swed wrote:
>> Well pretty interesting late afternoon.
>> The oscillator works but C-11 definitely is troubled. Additionally a key
>> element is an effective ground. Bridge the low side of the ampule to a
>> better ground and the oscillator seems to reliably start. Ignition occurs
>> when the oscillator is in the 80-85 MC range. It can tune from 65 to 130
> Interesting. I tuned for maximum amplitude. Seemed to work well enough.
> Now the neat part.
>> That 1-2 mm silver dot that I see in the ampule. When warm it actually
>> around as you tilt the lamp assembly! Like drop of water would but very
>> slowly. So I think this is the RB Magnus speaks of. I will need to peel
>> mica cover off the area to try to heat this up and return it hopefully to
>> The fact that the dot moves means I may be able to get it to the center of
>> the sphere to more easily heat it.
>> Magnus when you heated yours did it simply vaporize??? Or did you get it
>> simply move down deeper in the core area?
> I was quite brutal. I didn't remove it from the back-piece and mica, I just
> heated it up as it would be horizontally oriented. I used the end-piece and
> removal-tool as cool-off area and mechanical holder. I simply just heated it
> as it was heated in the oscillator the first time. Then I got the grey
> surface of the glas. Darn. Next I thought that I would let the got gas
> evaporate up in the colder corner... so I oriented the open glas downwards
> and let it remain in the holder, heated it properly up and saw the grey
> completion disappear, stayed on it with the heat somewhat longer and then
> just turned the heat off and let it sit there and cool down. When it had
> cooled down (I was able to hold the removal tool fairly quickly, so it was
> acting as an OK cooler) I looked into the lamp and could clearly see the
> rubidium blob right in the middle and no more splatter. Nice and clean.
> Other thing, measuring ignition time. On the first run just for the heck
>> it I flashed a led light into the ampule and it ignited instantly. So
>> perhaps for old hard starting end of life RB lamps this might be a trick
>> at least get it going for a bit longer.
> Hehe.. we are starting to have fun now. :)
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