Hi Mini-circuits will sell you the transformers already in a box. Needless to say, they do charge a bit for that. Occasionally, you can find them on eBay for a more rational price.
If you are going the DIY route, incorporating a couple of common mode chokes on both sides of the transformer is probably a good idea. Once you get rid of 60Hz, the next problem is all the crud your cell phone or WiFi device is spouting ….. Bob > On Oct 24, 2020, at 6:35 PM, paul swed <[email protected]> wrote: > > Jim > A couple of other suggestions. > A 1:1 Mini circuits transformer external to the unit They are quite small > and offer electrical isolation also. Use a small pomona box etc. > Another possibility is the typical RCA phono jack and plug. They come in > insulated models. Understanding its not 50 ohms but the discontinuity > length is pretty short. > Good luck and what you are doing does work. > I actually use the small 100 bT ethernet transformers from China. DIP size > two to a 14 pin package. Seriously does the job something like 500 Vac > isolation and no ground loops. They are inexpensive or at least were. 10 X > $2 or something silly and had been free shipping. Who knows these days. > Regards > Paul > WB8TSL > > > On Sat, Oct 24, 2020 at 4:44 PM AC0XU (Jim) <[email protected]> > 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 -- [email protected] >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. >> > <20F001N.pdf>_______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
