[time-nuts] Racal 9475 Rubidium

Bob kb8tq kb8tq at n1k.org
Tue May 1 09:16:36 EDT 2018


Hi

Ok, quick intro to Rb standards:

On an Rb you have a light bulb. It’s a really weird bulb but a bulb none the less. 
On most (but not all ) designs the bulb has a finite life. Various improvements
over the years have stretched out the life. Just when which outfits did which 
improvements …. who knows ….

Rb’s need to run hot. They have a couple of heated zones inside the physics 
package. Heat and electronics are not a good combo. Various designs have
issues on the stuff inside the hot zones. 

In addition to all this, they have crystal oscillators that drift. Once the oscillator
drifts far enough, the device isn’t going to lock up. 

That’s a quick, very non-specific to your unit, list.

Bob

> On May 1, 2018, at 5:18 AM, Paul Bicknell <paul at bicknells.f2s.com> wrote:
> 
> Hi all new member hear could any of you help with the following information
> 
> 
> 
> As I have just bought a Racal 9475 Rubidium and it has problems
> 
> 
> 
> Is there any stock faults ?
> 
> What is the life of the rubidium standard?
> 
> 
> 
> Regards Paul 
> 
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