> 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 -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
