Most general purpose passive splitters for the L-band regime are essentially variations on the Watkinson splitter, which provides good isolation between the output ports, if (and only if) the input port is driven from a matched source.
So if your GPS antenna, whether active or passive, has a good output match then the Samsung's input impedance will not affect operation of the Trimble. But, again, this is true only if the antenna's output impedance is matched to the splitter's characteristic impedance (including consideration of any impedance transformation in the transmission line between the antenna and the splitter). I cringe at the cavalier treatment given to line impedances used in GPS systems. AFAIK, all GPS equipment is designed for 50 ohms, yet a great deal of such equipment is provided with 'F' connectors, which invite the use of inexpensive RG-6 line, which is 75 ohm cable. In addition to problems with impedances and loading, It's a built-in source of multipath, all at no extra charge! Dana K8YUM On Tue, Jul 27, 2021 at 3:01 PM Don Cross <[email protected]> wrote: > On Tue, Jul 27, 2021 at 2:54 PM ordnit via time-nuts < > [email protected]> wrote: > > > > > Any guess? Do I have to throw the unit from the window? For your > > reference, I have a samsung unit connected to same antenna via a > > splitter. The GPSDO is performing very well. > > > > > Hi Ordnit, > > I'm hardly an expert, but I wonder about the splitter. Is this a passive or > active splitter? If passive, it could be the input impedance of your > Samsung is much lower than for your new Trimble and it is making the signal > seen by the Trimble too weak. If you are willing to disconnect the Samsung > temporarily, perhaps you could try connecting your antenna to the Trimble > only and see what happens. > > Don > _______________________________________________ > time-nuts mailing list -- [email protected] -- To unsubscribe send > an email to [email protected] > To unsubscribe, go to and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
