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two GPS devices on one antena?
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captain_sugar
 


Member Since: 05 Sep 2006
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Czech Republic 2014 Discovery 4 3.0 SDV6 HSE Auto Scotia GreyDiscovery 4
two GPS devices on one antena?

Does anybody know if it is possible to connect two GPS devices on one antena?
Not the d3 antena but in general. It seems logical that this is feasable but I can not find the T-connector.
Can anybody advice?

Thanks
  
Post #20482318th Sep 2007 10:02 am
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10forcash
 


Member Since: 09 Jun 2005
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not a hardware solution...
http://gpsgate.com/
  
Post #20482518th Sep 2007 10:10 am
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PaulP
 


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I think that technically yes you can, although it may attenuate the signal to the point where you lose lock or take a long(er) time to acquire a lock on each unit.

I also seem to remember that you should only do this if sending the GPS signal over some kind of network......sorry but I can't remember much more about this as I looked it up a long time ago...

BTW, we now have a separate Navigation/GPS section to post these questions....

Good luck! Thumbs Up
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Post #20482918th Sep 2007 10:14 am
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10forcash
 


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but what if it needs 'detailing' Shocked

so many choices....
  
Post #20483018th Sep 2007 10:18 am
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JMC
 


Member Since: 25 Feb 2006
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10forcash wrote:
but what if it needs 'detailing'

Rolling with laughter Rolling with laughter Rolling with laughter

You can split a received signal from one antenna between two devices with a simple T-piece. A drop in signal strength of -3db (1 'S-point') would be expected which is not important providing you have a good signal to start with. However, you cant do the same for transmitters, as splitting the signal in this manner means half of it is feeding back into the second transmitter. Neutral
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Post #20483418th Sep 2007 10:25 am
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captain_sugar
 


Member Since: 05 Sep 2006
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Czech Republic 2014 Discovery 4 3.0 SDV6 HSE Auto Scotia GreyDiscovery 4

so I just need to find the right T-connector:
one exit to the antena
one exit to the tomtom
one exit to the GPS logger (writes the car's position on a flash disk for later analysis)
Question
  
Post #20483518th Sep 2007 10:28 am
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DarrenG
 


Member Since: 31 Jan 2007
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There are plenty of reasons why this wouldn't be a good idea, attenuation of signal being the primary problem. At the frequencies used the signal loss through any T-Piece would be very high.
 Darren Griffin
Editor
PocketGPSWorld.Com 
 
Post #20502418th Sep 2007 5:09 pm
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Doctor Diesel
 


Member Since: 23 Sep 2006
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Plus many gps antennae are powered through the co-ax........antennas are cheap, just buy another
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Post #20506018th Sep 2007 5:50 pm
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JMC
 


Member Since: 25 Feb 2006
Location: Aberdeen-Angus. Where the Bull* comes from!
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DarrenG wrote:
At the frequencies used the signal loss through any T-Piece would be very high.

Embarassed Good point..... I was posting in VHF mode. Just get another antenna and tell them Doctor Diesel sent you..... Might get some discount (or some funny looks Wink )
 The older I get, the more I realise that people confuse wrinkles for wisdom Smile
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Post #20510618th Sep 2007 6:37 pm
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captain_sugar
 


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Czech Republic 2014 Discovery 4 3.0 SDV6 HSE Auto Scotia GreyDiscovery 4

the problem is I bought this stupid scenic for the company and ordered the athermic glass, not knowing it is blinding GPS signals. So each antenna must find some other place, probably the roof, and for two antenna, there will be drilling...
  
Post #20514718th Sep 2007 7:53 pm
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stapldm
 


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Perhaps you could do something creative like this? Then you'd only need one antenae on the roof...
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Post #20515118th Sep 2007 7:59 pm
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Slimer
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I've used a magnetic re-radiating antenna plugged in to the rear 12v point with the GPS cable run out under the tailgate seal and the re-radiating part stuck by the C-pillar. If you get one try and get one with a 2m range or you'll have to get it close to the units trying to get the signal
 The End  
Post #20516518th Sep 2007 8:16 pm
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Slimer
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This is the one I've got, works well
 The End  
Post #20517118th Sep 2007 8:22 pm
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DarrenG
 


Member Since: 31 Jan 2007
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captain_sugar wrote:
the problem is I bought this stupid scenic for the company and ordered the athermic glass, not knowing it is blinding GPS signals. So each antenna must find some other place, probably the roof, and for two antenna, there will be drilling...

The scenic's glass won't be affected by a GPS that uses the later chipsets such as SiRFStarIII, HammerHead, MTK. All these will function behind athermic coatings perfectly well. And then you won't need an external antenna at all!
 Darren Griffin
Editor
PocketGPSWorld.Com 
 
Post #20528419th Sep 2007 8:14 am
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DarrenG
 


Member Since: 31 Jan 2007
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stapldm wrote:
Perhaps you could do something creative like this? Then you'd only need one antenae on the roof...

Re-radiating antennas were banned a while back in the UK, that's why they suddenly disappeared off the shelves.
 Darren Griffin
Editor
PocketGPSWorld.Com 
 
Post #20528619th Sep 2007 8:15 am
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