Well with zero effort the spec sheet. Bob indeed there are common mode chokes in them. Jeeze a lot in 1 package along with center taps. Regards Paul WB8TSL
On Sun, Dec 14, 2014 at 12:22 PM, Bob Camp <[email protected]> wrote: > > Hi > > If you get the whole magnetics package (and not just a transformer) it > probably will have a pretty good common mode choke in it. If you go back to > the days of coax ethernet, the choke was more the “magic” that let them go > to twisted pair than the transformer. > > Why does this matter? > > Well … we seem to still be stuck back in the “coax ethernet” era when it > comes to standard distribution. Every time somebody brings up a need to go > hundreds of feet, coax becomes a second choice sort of solution. That’s > even more true for a pps. Don’t toss out the rest of the magnetics when you > salvage one of these old beasts … > > Why mention pps? There are more than one isolated pair on those > connectors. You would need to modulate the pps onto something at one end > and demodulate it at the other end. There are a lot of cheap ways to do > that, very much so if you are generating the pps yourself in something on > the transmitting end. > > Bob > > > > On Dec 14, 2014, at 11:59 AM, Alan Melia <[email protected]> > wrote: > > > > Hi Paul I confirm the 17MHz LPF response I didn't measure them for > flatness :-)) The source I used was surplus 16way 10BaseT switches which > were junked some time back but may still be lying in the back of store-room > cupboards.....you get a lot on one board that way. > > > > Alan > > G3NYK > > > > ----- Original Message ----- From: "paul swed" <[email protected]> > > To: "Time-nuts" <[email protected]> > > Sent: Sunday, December 14, 2014 4:18 PM > > Subject: [time-nuts] Frequency distribution isolation transformers > YCL20F001n arrived > > > > > >> Another Time-nut suggested the use of 10 baseT ethernet transformers > for 10 > >> MHz isolation that he pulls from old ethernet boards. The 20F001n. These > >> are available from UTSource on ebay at 90 cents each NOS. Ordered 20. > >> > >> Well I have to say as a BPF or something for 10 Mhz they are lousy. BUT > >> then how could they be when they are a pretty flat transformer from 40 > KHz > >> to 17 MHz! Take that Mini-Circuits. (Only in jest) Yes there are some > lumps > >> and bumps in that pass band But not large maybe 1-1.3db I need to get > much > >> more accurate. But now I have a nice transformer that can work at WWVB > 60 > >> Khz as well as with frequency distribution. > >> They come in a dip foot print and 2 X to a package. > >> I have more to check because to good to be true almost always is. At > least > >> for me. > >> Regards > >> Paul > >> WB8TSL > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >
20F001N.pdf
Description: Adobe PDF document
_______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
