[time-nuts] Opera coordinator has resigned

[Brooke Clarke]

Hi Achim:

SMA RF connectors have a very limited life (number of matings) until they are worn out.  That probably doesn't apply to 
SMA threaded fiber optic connectors.
Where can I get short fiber optic cables that mate with the Ocean Optics HR2000 Optical Spectrum Analyzer?
http://www.prc68.com/I/ML-OSA.shtml#HR2000

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/Brooke4Congress.html


Achim Vollhardt wrote:
> Dear John and all,
>
> I do work in high energy physics and we use LEMO and other standards. For some years now, I have started to advertise 
> against LEMO (in particular the LEMO 00 size), as it is VERY sensitive to mechanical defects and partial connection 
> (yes, you can ..). We have found very often defective LEMO connections, which could only be detected via time domain 
> reflectometry. Or LEMO interfaces, which changed impedance significantly when rotating them in the fully mated 
> position.. this list could be extended a lot more. And this famous click when mating is inaudible in typical high 
> energy physics electronics barracks.. too much fan noise.
>
> In addition, for the very fast signals of modern DAQ systems, LEMO 00 is just not up to speed (literally) anymore. If 
> size is not of ultimate importance, we switched to SMA, or SMC if size matters.
>
> About this dreadful OPERA fiber connector:
>
> It very much looks like a FC connector. It has a polarisation nut and I have to confess having misconnected them more 
> than once myself.
> It might have been beneficial to shorten in this standard the thread length so there is no possibility to engage the 
> thread (not even partially) when not properly aligned. As the thread is indeed fairly long, you can do what seemed to 
> have happened in OPERA.
>
>
> I acknowledge the importance of QA, but also some design-inherent features like low power indications should be in 
> place to prevent these things from happening.
>
> Regards,
> Achim
>
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