[time-nuts] Query about insulated coax panel connectors?

[paul swed]

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) <James.Schatzman at 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
>
>
>
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