Charismatic impedance, he? Was that with one wire for data and the two neighboring wires as ground?
Didier KO4BB Sent from my Droid Razr 4G LTE wireless tracker. -----Original Message----- From: Bob Camp <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> Sent: Sat, 20 Oct 2012 7:31 PM Subject: Re: [time-nuts] Are serial port headers standardized? Hi I do believe I can top that one :) Back in the 70's (do I need to mention jobs …) these were already an established item. Before that point (as in back in school … don't ask when that was) I spent some time modeling the charismatic impedance of the connector plus cable combination. Turns out that 120 ohms is a pretty good match… Bob On Oct 20, 2012, at 2:42 PM, Magnus Danielson <[email protected]> wrote: > On 10/20/2012 04:15 PM, Sarah White wrote: >> On 10/20/2012 10:06 AM, Bob Camp wrote: >>> Hi >>> >>> The IDC to 9 pin cables are a generic / cheap item on eBay or from Newegg. >>> Less than $3 delivered last time I needed any. >>> >>> Bob >> ((...snip...)) >> >> Motherboard manual said: >> "Connect one side of a switching cable to the header and then attach the >> serial COM device to the other side of the cable." >> >> ... is "IDC" another way of saying this? what does the acronym represent? > > IDC block header is a more correct term as I recall it. Wikipedia concurs: > http://en.wikipedia.org/wiki/Insulation-displacement_connector > > Back in the 80thies when I had my first job, these 10-pin IDC block header > serial cables was already an established standard. If you have hard serial > interface on your motherboard, be lucky, plug it in and run! > > Cheers, > Magnus > > _______________________________________________ > 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. _______________________________________________ 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.
