A good friend of mine, sadly of blessed memory, was a lead engineer for Grumman on the comm systems of the lunar lander. He spoke of small space-rated multi-pin connectors that cost upward of $500 each.
On Thursday, June 22, 2017, Arnold Tibus <[email protected]> wrote: > > Hello, > > I can second Magnus and want to throw in some more details. > Cannon, Deutsch, Bendix, Souriau, Matrix, Amphenol, etc. etc. are (big) > companies manufacturing all kind of connectors and are n o t connector > type designations! Important are the type numbers of the manufacturer or > higher level specification numbers. > We used in the aircraft and spacecraft business naturally the military > (MS-) numbers listed in the MIL-QPL (or eg. for Spacelab with GSFC spec. > no). Most types of connectors are under these numbers available from > different manufacturers, of course with different manufacturer in house > part numbers. Attention: the 'same' connectors may be bought w/o the > Mil.-spec. sheets with somewhat lesser quality. Important details are > the max. mating number, the contact resistance (e.g. 20 mOhm) and the > max. continuous current, max. Voltage, vibration resistance and > reliability etc. Of course, this makes good connectors somewhat > 'expensive'. Hirel and non-magnetic gold plated D- subminiture type > connectors do survive e.g. the rocket launch phase (high vibrations), > vacuum and low temperatures and are still used for space projects. > > The D-sub series of connectors was introduced by Cannon in 1952. They > are still available as standard, hirel, and non-magnetic versions. The > contacts were machined contacts forcrimping or soldering connection and > made of massive copper with gold finish. (more see e.g. > https://en.wikipedia.org/wiki/D-subminiature). Example for the standard > 9 pin connector designation (crimp): DEMAM-9S and DEMAM-9P. Today are a > big number of companies producing equivalent types. Cheap ones are > equipped with contacts made of sheetmetal. Nobody should expect then the > same spec. values as reliability, mating numbers, contact power rating etc. > It is up to the designer of a product to be informed and select the > right quality device for his product ... > > I hope I could enlight a bit the connector selection and nomenclature > point. > > regards, 73 > > Arnold, DK2WT > > > > Am 22.06.2017 um 21:10 schrieb Magnus Danielson: > > Hi, > > > > The second connect has been called "Cannon" and XLR, and is not > > generally recogniced as XLR, which is the product range name. > > > > Naming of the first connector as "Cannon" is at least for me and many > > others confusing. This is a good example how vendor name for a > > connector type is not a good thing. The first connector is a circular > > MIL-STD connector (don't remember the correct notation), and this is a > > product available from ITT Cannon as well as AMP. > > > > Cheers, > > Magnus > > > > On 06/22/2017 08:42 PM, Mark Spencer wrote: > >> Sorry if I have caused any un due confusion thru my perhaps incorrect > >> use of the terms "cannon" and "XLR." > >> The green connector with 4 separate female contacts is what I > >> perhaps in correctly referred to as a "cannon" connector. The silver > >> connector with 3 separate female contacts was what I perhaps > >> incorrectly referred to as a "XLR" connector. > >> > >> Both were in use in my lab powering time nuts gear. > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> Mark Spencer > >> > >> [email protected] <javascript:;> > >> > >> > >> > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] <javascript:;> > >> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- [email protected] <javascript:;> > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] <javascript:;> > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > -- William H Fite, PhD Independent Consultant Statistical Analysis & Research Methods _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
