[time-nuts] RF isolation requirements for multiple GPS receivers

[Mike Cook]

Hi,
   I am using Mini-Circuits ZN4PD1-50+. They are about 30dB in the GPS frequency band. I hang 4 receivers each off three of these mixing Motorola, Ublox, Trimble and Navspark and never had an issue. 
Mike

>  Le 27 nov. 2018 à 14:44, Dana Whitlow <k8yumdoober at gmail.com> a écrit :
> 
> I want to run about 4 separate GPS units of disparate
> manufacture from a single antenna.  My plan is to
> provide power for the antenna via a bias tee (power
> inserter) at the bottom end of the antenna's cable, then
> use an isolating splitter on the receiver side of the bias
> tee to split to the various receivers.
> 
> My question is: how much isolation between receivers
> is likely to be necessary?  Real life splitters are only
> so-so in isolation performance (15-25 dB), and may
> e significantly worse if the antenna's LNA's output is
> a poor match.  So I'm wondering if I'm going to need
> more amplifiers in the splitter's outputs just for the sake
> of adequate isolation between the GPS receivers.
> 
> Thanks,
> 
> Dana    K8YUM
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