[time-nuts] To use or not to use transmission line splitters for GPS receivers

paul swed paulswedb at gmail.com
Tue Oct 9 16:59:22 UTC 2012


Yes indeed its a depends since in the original thread there was not a
specific requirement.
But as you say its a design. If you do not want to design makes more sense
to grab a ebay wonder I suspect. For me I had fun designing and saving a
buck. 8 ports verses 2...
Regards
Paul
WB8TSL

On Tue, Oct 9, 2012 at 12:10 PM, <johncroos at aol.com> wrote:

> Hello All -
>
> I do not believe there is a hard Yes or No answer for this question.
> It depends upon the performance specification of the system elements
> and the system requirements.
>
> For instance if the leakage of noise and discrete signals from each
> receiver out
> of the antenna port combined with the port to port isolation of the power
> divider
> is below the level of harm to the associated receivers then the answer is
> yes.
> Otherwise NO.
>
> The issue of antenna power is simply solved by placing a DC block in the
> line from the splitter to
> all but one of the receivers. It then powers the antenna for all of them.
> I use this system with
> a 3 way splitter and 3 T bolts. More elaborate and redundant schemes are
> possible with a bit of engineering.
>
> I have several of the receivers developed by Novatel for the early WASS
> project experiments.
> These boxes used 3 receivers as both L1 and L2 were involved.
>
> A standard Mini Circuits power splitter was employed to feed the antenna
> to all 3. Apparently that
> sufficed for what was a pretty demanding requirement.
>
> Finally - Anyone advocating a hard Yes or No to this question without
> first considering the performance
> numbers for the system elements has been smoking their view-graphs. With
> proper design it is totally
> feasible to feed a number of receivers from one antenna.
>
> -john k6iql
>
>
>
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