General Radio used to have some common values of capacitances available in "terminator" type configuration and "passthru"/"bulkhead" type configuration. These were moderately useful doing some bridge-type measurements. I remember blowing one up once, and taking it apart being pretty impressed the capacitor was a concentric design. I haven't seen examples of these newer than the type 874 hermaphoditic connectors.
I swear a couple decades ago I saw BNC terminator-type capacitors in the Pasternack catalogs that filled my mailboxes, but I never saw any of these in the flesh. I do know that "DC blocking capacitor" series-capacitor BNC's are widely available from Pasternack and others. Tim N3QE Tim N3QE On Fri, Jul 25, 2014 at 7:31 AM, Stefan Heinzmann <stefan_heinzm...@gmx.de> wrote: > On 24.07.2014 18:00, Ackermann, John R wrote: > >> >> Just FWIW, the TADD-1 uses transformers to provide DC isolation, but the >> shield side of the coax goes to ground through a 0.1uF cap. The hope is >> that this reduces the issue that John's referring to (and which I've >> seen plenty of times using baluns). >> > > For optimum results with respect to high RF frequencies, I'd expect that > you would need this cap to be annular, so that the cable can pass through > the middle, and the outside connects to the chassis hole all around. This > is like a feedthrough capacitor, except that the wire that goes through the > center actually is a coaxial cable. > > While feedthrough caps for single wires are common, I haven't seen any for > coaxial cables (rigid or semi-rigid cables come to mind). Do they really > not exist, and if so why? Or have I failed to look in the right places? > > Cheers > Stefan > > > _______________________________________________ > 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.