Dear Jim These, in conjunction with some M6 nylon washers, work OK for isolating an SMA bulkhead feedthrough from the case: https://www.minikits.com.au/components/hardware/washers/Metric-M6-Washers (the nylon shoulder washers down the bottom) The connector will rotate though if you try to torque up the SMA nut - you can really only make them finger tight.
Otherwise, you can buy isolated bulkhead feedthroughs eg https://www.fccable.com/SMA-Female-To-SMA-Female-Bulkhead-Isolated-Ground-Adapter/2068/A1636/ or https://www.centricrf.com/adapters/sma-adapters/sma-to-sma-bulkhead-adapters-18ghz/c3150b-sma-f-f-isolated-ground-bulkhead-adapter/ I never found anything cheaper than about $US20 per connector. Cheers Michael On Sun, Oct 25, 2020 at 7:44 AM AC0XU (Jim) <james.schatz...@ac0xu.com> wrote: > > Time-nuts: > > Having recently run into major ground loop noise issues, I have begun > reworking some of my homemade pieces of equipment using insulated coax > connectors. My goal is to have one ground connection only in the cases, and > that is at the power entry point, either a power cord or the outer terminal > of a DIN. I am also installing isolation baluns on inputs and/or outputs. > > Insulated BNCs are readily available. Others not so. In some cases, there is > not room to install an insulated BNC. I am not finding any insulated SMA, > SMC, SSMA, or SSMC despite googling and searching catalogs. > > Does anyone know of a source for insulated small threaded coax panel > connectors? > > Another option would be a compact insulating bushing that an SMA panel > connector, for example, could be mounted in. I am not finding anything like > that either... In fact the ideal solution would be an insulated SMA with an > integrated 1:1 balun. > > And I am not thinking about using plastic cases - that would introduce a > whole other set of problems. I think about my lab area at work where a bundle > of dozens of gigabit ethernet cables run through the roof directly over the > lab bench - the ambient noise level is quite high. > > Suggestions??? > > The only idea I have some up with is to design something myself, possibly 3-D > printed... Any suggestions about how to get started on something like that? > > Thanks in advance- > Jim > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
