[time-nuts] R&S XSRM Rubidium
paulswedb at gmail.com
Fri Jan 21 15:08:11 UTC 2011
Exactly my thinking they are very cheap. Well heck they are very old. I
guess thats why.
So I am really unconcerned about whats next. Its a great learning exercise
my interest and I am taking pixs as I go along. There had been pixs on the
web but the links seem broken for the FRS C.
I realized as I shut everything down last night I had not supplied power to
the rb lamp heater. Will do that. But still the rf oscillators not reliably
starting and I wouldn't think heat has an effect on that. But will sure find
Additionally I built a small extender cable that allows the RB assembly to
be comfortably separated from the rest of the electronics to the length of
the coax cable makes it very easy to work on everything. Used a 20 pin auget
socket cut apart and 4" of wire per connection. Its tricky because you have
to file the FM socket end down so it will fit through the shield.
The things we do for a RB flashlight.
On Fri, Jan 21, 2011 at 7:38 AM, Bob Camp <lists at rtty.us> wrote:
> I would not do anything that's not reversible. You may well come across a
> FRS-C that's got a good lamp and dead electronics.
> Of course given what telco Rb's cost these days ....
> On Jan 20, 2011, at 10:47 PM, paul swed wrote:
> > Well I think bad news.
> > I have a frs c apart. Unfortunately the rb lamp doesn't even light at
> all. I
> > have been getting RF at about 80.5 Mhz though at the moment I am not. I
> > not see any residue on the bulb.
> > On one of the websites I did see that the lamp should run outside of the
> > oven. Granted not correctly but should ignite. I guess my low lamp V was
> > really saying no lamp. So my fear is this really is not recoverable.
> > I plan to dig into the oscillator tomorrow to see whats up.
> > Regards
> > Paul
> > WB8TSL
> > On Wed, Jan 12, 2011 at 3:09 PM, Bruce Griffiths <
> bruce.griffiths at xtra.co.nz
> >> wrote:
> >> Magnus Danielson wrote:
> >>> On 12/01/11 18:41, paul swed wrote:
> >>>> Did you use a large heat gun or the smaller ones for heat shrink.
> >>>> I might guess the smaller one
> >>> I have a smaller one so that was what I used and it was more than
> >>> sufficient. I will get a large one too, but with some propper effect
> >>> control.
> >>> Cheers,
> >>> Magnus
> >>> Just wire a dimmer in series with the heater element.
> >> Bruce
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