Hi If you have a phase noise under vibration requirement, you do *not* want to use the “D connector” setup. Go with an SMA ….
Bob > On Jun 24, 2017, at 7:54 PM, Didier Juges <[email protected]> wrote: > > I have been forced to use micro-D by a customer on a military power supply, > not even space rated, it was well over $100 each in 50 piece quantity (I > think it was a 25 pin). > > However, unless they are mistreated (which is easy for the reason you > listed), they seem reliable. I do not believe we have replaced one in over > 400 units shipped and a 15 year period (aside from a couple of prototypes > that went through hell). That must be one of our better customers... > > The design choice of protecting the pin instead of the socket is baffling. > > > On Jun 23, 2017 7:03 PM, "jimlux" <[email protected]> wrote: > > On 6/22/17 4:22 PM, William H. Fite wrote: > >> 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. >> >> >> The Micro-D is widely used in spaceflight, and is a pox on the connector > world - not only are they expensive, the way the pins and jacks are made is > almost asking for damage - the pin is shrouded in a hole, and the jack is > exposed. $100 for a 9 pin wouldn't surprise me. > > Lately, I've been encountering nano-D (Glenair, Omnetics) - they're not as > delicate, they're smaller. > > > > > > >> 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. >>> >> > > AMP (and others) sell a lower cost version called the "Circular Plastic > Connector" or CPC. A coarser screw thread than the round metal MS > connectors. > > The round connectors (called Bendix connectors by some at JPL, because, of > course, that was the mfr for some batch of them) have a nice mil-std to > define them. There's a Shell, an Insert, and pins/jacks. You can get > shells and inserts with different keys and "clocking" to prevent mismates. > There are coax and triax inserts, high voltage inserts, etc. > > While they're pricey brand new, there are numerous surplus suppliers (Apex > Electronics in Sun Valley, CA used to have thousands of them). > > You can get them hermetic, vacuum tight, waterproof, locking, non-locking, > every kind dielectric imaginable, etc. > > > > > > > >>> 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 ... >>> >> > > My problem with D-sub is two fold: > 1) making a chassis hole is a pain - although now, with places like Front > Panel Express, it's less so. > 2) the shroud around the plug/male gender is easy to bend if it gets > stepped on. Sure, for flight hardware, carefully handled under the > watchful eye of QA, not an issue, but I have lots of these from my > not-entirely-mis-spent youth that are bent. > > They do come with removable pins/jacks, and you can get coax flavors too. > They're fairly compact in a panel. > > > Other connectors of interest are those made by Lemo and Hirose. Lemo are > locking, pretty rugged when mated, and small for the number of conductors. > You see them on high end video and medical gear. > > There's also something about double banana plugs and mating jacks. I go > back and forth between PP and banana plugs for preference. > > BTW, there are panel mounts for PP. > > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ > 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. _______________________________________________ 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.
