[time-nuts] Racal 9475 Rubidium

Jerry Hancock jerry at hanler.com
Tue May 1 11:35:55 EDT 2018


They also suffer from all the typical electronic component age related faults.  I had 5 units that had four bad capacitors each, for instance, and after replacing the caps, they run well.
Regards,

Jerry


> On May 1, 2018, at 6:16 AM, Bob kb8tq <kb8tq at n1k.org> wrote:
> 
> 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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