Dan Great and at least for me it makes sense from the active splitters I have seen that use diodes to allow one receiver to power the pre-amp. In my 8 way you have the diodes and L+Cs. The powered path is essentially the diode turned on. The non powered is a reverse biased diode and the C around the diode and then the Ls of the DC path. Something like that. I did the same thing as you in the 8 way splitter. Separate DC bias feeding upstream to a intermediate amp ahead of the splitter to make up for the 8 way splitter loss about 16 db as I recall. With humor I am finding 8 ports isn't quite enough! Silly. Regards Paul WB8TSL
On Wed, Dec 23, 2015 at 11:11 AM, Dan Kemppainen <[email protected]> wrote: > Hi all, > > Thanks for all the responses. > > The GPS units were swapped on the splitter ports, and the phase difference > did in fact change. It changed from 21nS to around 5nS. Not exactly what > was expected, although it would tend to indicate the RF path is not the > same through the splitter. > > Last night a 'symmetrical splitter' was made up using a mini circuits > ZFRSC-42. Both of the outputs to the GPS units were AC coupled. A bias T > was inserted directly on the antenna feed with external power feeding the > new splitter antenna port. > > The PPS's are now very close, about 1 nS average difference. If this holds > solid, in a few days I'll swap splitter ports again. > > Thanks, > Dan > > > > > > > > > > > _______________________________________________ > 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.
