low MHz connector design consultant
in [Design]
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From: Joerg on 30 Apr 2010 17:14 mpm wrote: > On Apr 30, 3:09 pm, "Joel Koltner" <zapwireDASHgro...(a)yahoo.com> > wrote: >> "Jan Panteltje" <pNaonStpealm...(a)yahoo.com> wrote in message >> >> news:hrfc9o$u9b$1(a)news.albasani.net... >> >>> I use them today, a lot: >>> http://panteltje.com/panteltje/pic/swr_pic/swr_box_rear_img_0976.jpg >> Gee, Jan, you do know that DB-9 backshells are something like $0.19... right? >> :-) > > Well, at least he's using the same hardware everywhere. > I hate it when one side of something is screwed in using a straight > blade, and the other side a Phillips!! You should have seen some of the stuff I built as a kid. When I ran out of screws I occasionally used a chunk from a nail, stuck it through and flattened it using a punch. But only if I was fairly sure that I never needed to swap things because that would have required my dad's electric drill. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Wimpie on 30 Apr 2010 17:31 On 30 abr, 13:54, "mook johnson" <m...(a)mook.net> wrote: > "John Larkin" <jjlar...(a)highNOTlandTHIStechnologyPART.com> wrote in message > > news:ql9kt5tg7s7e5q7pb460gcdig4r00jjmrj(a)4ax.com... > > > > > On Thu, 29 Apr 2010 18:30:41 -0500, "mook johnson" <m...(a)mook.net> > > wrote: > > >>Gents, > > >>I looking for a consultant that can assist in the design of a custom > >>military style connector with controlled characteristic impedance and > >>insertion loss between two terminals in the 1MHz - 20MHz frequency range. > > >>This connector is special because is the application so an off the shelf > >>component will not work. > > >>Any leads where I can start looking for such a consultant? > > >>thanks > > > There are so many military connectors, including ones for wild > > environments, hermetic, etc, some standard part might work. > > > 20 MHz isn't very demanding. Most any mil connector will be "matched" > > to any impedance at 20 MHz. Wavelength is 15 meters! > > > John > > The connector I need goes into environments that far exceed military > applications but the physical concept is similar. We have an in-house > connector company that makes these connectors for us but they have never had > to deal with never greater than >200KHz signals before. We tried using our > regular connectors for this application and the impedance mismatch and > insertion loss were extreme at 5 - 20MHz. The Zo mismatched by 50% and was > not stable above 1MHz and had several resonant modes. Insertion loss > something on the order is 6dB/connector and we'll have a couple dozen in > series on this line. The number of series connection is the is the rub and > it is unavoidable, non negotiable. > > There are some commercial plastic connectors that tested very well (just to > validate our test setup) with good impedance match/stability (+/- 5%) and > low insertion loss (.1dB/connector) but they won't take the environment. > > I'm looking for a consultant that can provide either of the following > > 1) model a connector that is already designed but not made (basically review > the in-house company proposed design) and simulate the high frequency > response of the design. > > 2) Give direction for the connector design based on constraints of material > choices, physical size and geometry to meet the desired electrical signal > characteristics while withstanding the environmental conditions. > > The cut and try approach based on simple equations has a long cycle time. > I'm looking to improve my chances of getting it right the first time. Hello Mook, When you have already a company that knows mechanical design and reliability issues, you only need the EM-field guy. When you can keep the mechanical guys and the EM-field guy in one room, this should converge to a solution fast. One familiar with the concept of characteristic impedance, complex propagation constant (contains both complex epsilon and permeability) and know how to measure the material constants can do the job. What about: required Return Loss, characteristic impedance, Insertion loss, propagation delay, size, cross section, (coaxial, square, symmetrical, etc), peak and average power, etc? Kind regards, Wim PA3DJS www.tetech.nl when you delete abc first, PM will reach me
From: Michael A. Terrell on 30 Apr 2010 18:24 Joel Koltner wrote: > > "Jan Panteltje" <pNaonStpealmtje(a)yahoo.com> wrote in message > news:hrfc9o$u9b$1(a)news.albasani.net... > > I use them today, a lot: > > http://panteltje.com/panteltje/pic/swr_pic/swr_box_rear_img_0976.jpg > > Gee, Jan, you do know that DB-9 backshells are something like $0.19... right? > :-) You mean DE-9? -- Anyone wanting to run for any political office in the US should have to have a DD214, and a honorable discharge.
From: Joel Koltner on 30 Apr 2010 18:44 "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote in message news:yMCdnfd1YekXxUbWnZ2dnUVZ_i2jnZ2d(a)earthlink.com... > You mean DE-9? If I actually wanted to be technically correct, yep, that's what I would mean. :-)
From: Jan Panteltje on 30 Apr 2010 19:00
On a sunny day (Fri, 30 Apr 2010 13:09:44 -0700) it happened "Joel Koltner" <zapwireDASHgroups(a)yahoo.com> wrote in <dOGCn.605101$FK3.431115(a)en-nntp-06.dc1.easynews.com>: >"Jan Panteltje" <pNaonStpealmtje(a)yahoo.com> wrote in message >news:hrfc9o$u9b$1(a)news.albasani.net... >> I use them today, a lot: >> http://panteltje.com/panteltje/pic/swr_pic/swr_box_rear_img_0976.jpg > >Gee, Jan, you do know that DB-9 backshells are something like $0.19... right? >:-) Yes, some are, that one has been replaced by a USB-to-serial 9 Euro adaptor. Need to stock up on both shells and adaptors... |