On 03/31/2012 10:08 PM, Javier Serrano wrote:
On Sat, Mar 31, 2012 at 9:24 PM, Achim Vollhardt<[email protected]> 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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