Marc Bury skrev: > > Magnus wrote: >> Isolational transformers (basically 1:1 transformers, preferably >> double-shielded, where each shield is hooked to the respective cable shield >> side) >> is usually preferred in this context. It can be effective to connect the >> grounds on both sides to see if it causes the problem to reoccur, if not it >> is only >> a precaution to have the transformer. > > Isolation transformers are widely used in communications for RJ-45 Ethernet > links, with cheaply available > 1:1 transformers giving 1Gb/sec and more.
Certainly. I actually can't remember one electrical Ethernet variant which haven't used them and I remember the old evil days even. > They are also used in standard SP/DIF over coax in digital audio application > to prevent ground loops. To be honest, for S/P-DIF it is more rarely used where as for AES/EBU it is much more common. Then there is all the PDH speeds, ISDN and other digital loops which uses them. Regardless, there is plentifull of them. > So, plenty of cheap available hardware you can re-use for tinkering ! Certainly. However, I think Joes problem was a little more fundamental for the moment. But for the lower frequencies he was asking the rules generally is 1) Bond the nodes down with a bonding network 2) use isolational transformers if needed. For higheŕ frequencies adding RF chokes and capacitive common mode bonding (if not low-resistive) etc. is most probably the most effective way to isolate things. Cheers, Magnus > Marc > > > > > _______________________________________________ > 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.
