Re: [time-nuts] Power connectors continued
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 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" 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 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 ru
Re: [time-nuts] Power connectors continued
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" 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 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 -- time-nuts@febo.com
Re: [time-nuts] Power connectors continued
This is what we use with good results Bert Kehren In a message dated 6/24/2017 12:03:09 A.M. Eastern Daylight Time, csteinm...@yandex.com writes: Someone previously mentioned "aviation" style connectors (which many will recognize as mobile microphone connectors) (see graphic below). I switched to these for power and other connections long ago, and have been extremely happy with them. One nice thing about them (IMO) is that all chassis connectors are male, and all cable connectors are female (unless you use a male in-line connector to make an extension cable). This means that a dangling cable will never have rudely exposed contacts, and if you are really worried you can use vinyl caps to make sure. Similarly, the pins on the male chassis connectors are well recessed so it isn't easy to short them, but if you want to be sure you can get screw-on caps (see below). The contacts have substantial tension when mating/mated, plus secure threaded locking rings. They will definitely not work loose. They will handle at least 5A per pin, and I've seen published ratings of 10A. They have good strain reliefs, too. They are available in a wide range of pin counts, so it is easy to make sure cables are not cross-compatible. One really nice feature is the availability of right-angle in-line connectors, to minimize the space needed behind equipment (this can be problematic with some other connector series). Use many connectors and you will find that this can be an extremely valuable feature. On ebay, they are known as "aviation connectors," and are available in three sizes (12mm, 16mm, and 20mm, according to the diameter of the bodies, which is also the hole size for the chassis-mount connectors). Search for GX12, GX16, and GX20. I have standardized on the 16mm version, but have tried and can recommend them all. Shop a little and you will find them at very attractive prices. I've bought lots of them, from US and foreign suppliers, and as far as I can tell they all come out of the same factory in China. All good quality. Best regards, Charles ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
