Hi all,
 
Does anyone know/ have any experience on connecting two separate GPS
receiver modules on one single antenna?
I'll be needing two GPS receivers Motorola CT-oncore but would like to
install only one antenna on the vehicle
 
thanks Martijn.
 

----- Original Message ----- 
From: "Martijn Broens" <martijn@mart...>
To: <msp430@msp4...>
Sent: Friday, November 14, 2003 10:32 AM
Subject: [msp430] GPS question


> Hi all,
>
> Does anyone know/ have any experience on connecting two separate GPS
> receiver modules on one single antenna?
> I'll be needing two GPS receivers Motorola CT-oncore but would like to
> install only one antenna on the vehicle

You need an RF splitter. MCL makes them: http://www.minicircuits.com

It's quite easy to make your own for HF/VHF but rather tricky at microwave
frequencies.

Leon
--
Leon Heller, G1HSM
Email: aqzf13@aqzf...
http://webspace.webring.com/people/jl/leon_heller/

If you are using an active antenna then you will have
to be careful about who supplies the power.  Easy if
one or both units are supplyiong the bias voltage all
the time, but if they are using SiRF tricklepower (tm)
mode or an equivalent pulsed on/off power saving
scheme then you may have more of a problem.

Ian

 --- Leon Heller <leon_heller@leon...> wrote: > 
> ----- Original Message ----- 
> From: "Martijn Broens" <martijn@mart...>
> To: <msp430@msp4...>
> Sent: Friday, November 14, 2003 10:32 AM
> Subject: [msp430] GPS question
> 
> 
> > Hi all,
> >
> > Does anyone know/ have any experience on
> connecting two separate GPS
> > receiver modules on one single antenna?
> > I'll be needing two GPS receivers Motorola
> CT-oncore but would like to
> > install only one antenna on the vehicle
> 
> You need an RF splitter. MCL makes them:
> http://www.minicircuits.com
> 
> It's quite easy to make your own for HF/VHF but
> rather tricky at microwave
> frequencies.
> 
> Leon
> --
> Leon Heller, G1HSM
> Email: aqzf13@aqzf...
> http://webspace.webring.com/people/jl/leon_heller/
> 
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	Several companies make GPS antenna splitters, where one port does not have
a 
DC block, and the remaining do.  There are also some versions where all the 
ports have DC blocking, and power to the antenna is injected by the splitter.  

	I don't have the part numbers readily available, but we use sevreal
splitters 
cascaded with one port passing power in our test setup.  Each test station 
can test 30 units at a time, which requires GPS, cellular antenna (we use 
individuals for that, since they transmit), power supplies, and associated 
simulation logic.  

	The splitters are not particularly expensive.  Next time I'm over at the
test 
facility, I'll try to get the model number of the splitter.

	--jc

On Friday 14 November 2003 05:32 am, Martijn Broens
wrote:
>  Hi all,
>
>  Does anyone know/ have any experience on connecting two separate GPS
>  receiver modules on one single antenna?
>  I'll be needing two GPS receivers Motorola CT-oncore but would like
to
>  install only one antenna on the vehicle
>
>  thanks Martijn.
>
>
>
>  
>
>
>
>
> 
>
>
>
>
>
>
>  .
>
>
>
>