Hi >From what I've seen, a 50 ohm load on the 8th port of an 8 port splitter does >a pretty god job of doing the DC correction. No need for an inductor, >everything matches up just fine.
Since you have an amp in the antenna, you don't *always* need an amp in front of the splitter. A lot depends on how much cable loss you happen to have (and the gain of the amp in the antenna). With a modest amount of cable (< 50') eight port splitters seem to work pretty well. Bob On Jun 29, 2013, at 4:34 PM, Magnus Danielson <[email protected]> wrote: > Hi Bob, > > On 06/29/2013 08:43 PM, Bob Camp wrote: >> Hi >> >> The auction sites are great sources of GPS splitters. I've gotten Mini >> Circuits splitters for much less than what they go for new. All of the ones >> I've seen do indeed pass DC. >> >> One thing to consider - you may want one with an extra port on it. Some GPS >> cards are a bit sensitive to antenna current. If you gang up seven >> receivers, one may not see enough drain to turn off the antenna alarm. The >> simple answer is to terminate one port with a resistor to ground. >> >> If you do need to inject DC, they make purpose built gizmos. You can also >> run one of the Symmetricom splitters that has DC blocking on all but one >> port. They tend to be expensive. > > For GPS receivers needing more DC load, I've found that hooking up a DC load > through a SMD inductor in series with a SMD resistor (150 Ohm is what I've > used). I hacked that onto a BNC-T and it got a GPS receiver to work. > > Strange that my hobby-hack is drive-by delivered to one of the major > telecom operators, but it solved their problems. :) > > A splitter should have a pre-amplifier. > > Cheers, > Magnus > _______________________________________________ > 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.
