[time-nuts] RF isolation requirements for multiple GPS receivers
Bob kb8tq
kb8tq at n1k.org
Tue Nov 27 15:23:16 UTC 2018
Hi
I’ve run …. errr … lots ( > 40) of GPSDO’s on a common antenna with a single
amp and passive splitters. I’ve never seen any issues. That includes cases
with multiple ports un-terminated ( so not terrific isolation).
Bob
> On Nov 27, 2018, at 8:44 AM, Dana Whitlow <k8yumdoober at gmail.com> wrote:
>
> 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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