[time-nuts] CSAC State of Play

[Jordan Dean]

We had one with <<100hours on it, working when stored (in temperature controlled office), failed vacuum when powered up 6 months later.  

It was replaced without hassle  (well, no hassle to us, not sure if Jackson had to fight with the manufacturer).

I have heard from sources inside and outside the company that the issue has been fixed, so the newer ones should be good to go for most applications.  (they still have a somewhat restricted temperature range).

-Jordan

-----Original Message-----
From: time-nuts <time-nuts-bounces at lists.febo.com> On Behalf Of Bob kb8tq
Sent: Tuesday, January 12, 2021 8:23 AM
To: gandalfg8 at aol.com; Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>
Subject: Re: [time-nuts] CSAC State of Play

Hi

Root cause (as mentioned earlier) seems to be a problem with the seal on the inner “magic guts” of the device. There are units that seem to run on and on forever with no issues, so it’s not a 100% sort of thing. The problem goes back to fairly early CSAC production lots and seems to have been a tough one for them to take care of. 

We had some early CSAC units die that way and they were replaced without much hassle. 
They had not seen any sort of extended (as in weeks / months) high temperature exposure. They had been through standard testing which would take them over the entier temperature range. While the failure mode *could* have been the same, there is no way to be 100% sure. 

Bob

> On Jan 11, 2021, at 8:36 PM, Nigel gm8pzr via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> A few years ago SA45s CSAC modules were all the rage, and I was more 
> than happy to acquire a few as fallout from a UK MOD project.
> 
> It wasn't too long after though that reports were suggesting earlier failures than expected, but I can't for the life of me remember why.
> Something underwater does come to mind, a long term project that wasn't perhaps as long term as expected, either way someting went pear shaped, anyone have any idea of what it was and the current state of play?
> 
> Nigel, GM8PZR
> 
> 
> 
> 
> 
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