[time-nuts] WTS: Efratom PTB-100 Precision Timebase

Magnus Danielson magnus at rubidium.dyndns.org
Wed Jul 11 10:40:32 EDT 2018


Hi Don,

This is the benefit of the old beasts, as you fiddle around with them
you learn so much more than supply power, turn the EFC and go "and then
what?".

I still find that I need to study the details of optical pumping more.

Cheers,
Magnus

On 07/11/2018 02:54 PM, Don at True-Cal wrote:
> Thanks everyone for the insightful comments. I've been inspired by off-list
> help to get this unit working primarily because of the quality of the
> internal FRK. If nothing else, it has been a tremendous learning experience
> and after numerous hours studying the manual and bench testing I find myself
> knowing far more about optical pumping and Rb absorption lines than I
> thought I ever wanted to know. I keep you posted if I have a breakthrough.
> 
> Regards,
> Don
> 
> -----Original Message-----
> From: time-nuts <time-nuts-bounces at lists.febo.com> On Behalf Of ed breya
> Sent: Monday, July 09, 2018 7:30 PM
> To: time-nuts at lists.febo.com
> Subject: Re: [time-nuts] WTS: Efratom PTB-100 Precision Timebase
> 
> It's not necessarily a fault in the Rb physics - sometimes "regular" 
> circuit or component problems cause the grief.
> 
> I have three units kind of like this - "SPTB-100/LN-001," to be exact, with
> 5 MHz out. As I recall, it's similar to the M-100, so close enough to use
> some of its available schematics and info. I had a problem a few years back
> with one that wouldn't lock, and found that a ceramic capacitor in the
> VCOCXO PLL filter had gone bad - leaky, so it never settled down. I could
> not ID the exact circuit or part because that's one of the areas that
> differs quite a bit from the M-100. Replacing the cap brought it back to
> normal operation.
> 
> I haven't searched for the "proper" manuals/schematics in a while. If anyone
> knows of these being available, please let me know.
> 
> Ed
> 
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