I have a couple of BNC-to-scope_probe adapters... On Thu, Apr 12, 2012 at 9:56 AM, Hal Murray <hmur...@megapathdsl.net> wrote:
> > > Just the T and a DC block. 1/4 wave at 60 kHz is far, far longer than any > > cable you have. > > This is time-nuts. Somebody is likely to do something most of us would > consider, well, nutty. > > It's probably reasonable to make a lumped-circuit approximation of a long > transmission line at 60 KHz or 100 KHz. > > Many years ago, when we were working on early 10 Mb Ethernet, a friend > rigged > up a good approximation to a long chunk of coax with 1 R and 1 C and a few > clip leads. It looked pretty good on a scope. > > I ordered several 500 ft spools of coax so we could test the real thing. > 500 > ft of Ethernet coax (not thinwire) is a serious spool. A key step was > getting the maintainance guy to build a dolly with serious casters. He was > happy to do something strange. The result was slight overkill which is > what > I wanted. It worked great. Every lab should have one. :) > > How many of you have used the Tek scope-probe to BNC adapter? I tried a > bit > but couldn't find anything on the web. The idea was (roughly) that you > put a > BNC Tee in the line you wanted to watch and this magic gizmo on the Tee. > One > end was BNC. The other end was a hole where you inserted a scope probe. > The > idea was to avoid the inductance on the pigtail for the ground cliplead. > > ---------- > > Not quite so many years ago, we built a SONET/OC-3 delay box. It was just > a > fiber optic receiver, FPGA, knobs, memory, and fiber optic transmitter. > The > FPGA could just barely run at 155 megabits. We used a recycled memory > module. I think it was 36 bits wide with 1 megabit chips. The idea was to > let the software guys test long links in their lab. It worked great. (I > think that size memory covered (roughly) California to Paris.) > > > -- > These are my opinions, not necessarily my employer's. I hate spam. > > > > > _______________________________________________ > 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.