[time-nuts] Coax Connectors (was Re: Opera coordinator has resigned)

Azelio Boriani azelio.boriani at screen.it
Sun Apr 1 11:01:02 UTC 2012


Yes, I recommend using MCX/SMB. We use MCX, SMB and MMCX but the MMCX in my
opinion is to avoid.

On Sun, Apr 1, 2012 at 12:13 AM, Magnus Danielson <
magnus at rubidium.dyndns.org> wrote:

> On 03/31/2012 10:08 PM, Javier Serrano wrote:
>
>> On Sat, Mar 31, 2012 at 9:24 PM, Achim Vollhardt<avollhar at physik.uzh.ch>
>>  wrote:
>>
>>> 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.
>>>
>>
>> I am very interested in this, since we just decided to use LEMO 00
>> over SMC in some of our designs:
>> http://www.ohwr.org/projects/fmc-projects/wiki/SMC_vs_LEMO
>> This is for ~100MHz work, so bandwidth was not an issue. Compatibility
>> with legacy was the major criterion in our case.
>> I would be interested in reading what people are using as coax
>> connectors in space-constrained environments like FMC, and why.
>>
>
> You should have included SMB in that comparison. It would have been a
> closer match to the LEMO 00.
>
> Cheers,
> Magnus
>
>
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