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Co-phasing aerials


 
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:::Matski:::
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Joined: 27 Dec 2005
Posts: 5181
Location: York

PostPosted: Fri Jan 11, 2008 11:42    Post subject: Co-phasing aerials Reply with quote

I have been speeking to Jim at 4x4CB regarding running two aerials one on each gutter in the middle of the truck to get a god central ground plane.

However it looks like running twin aerials on a 4x4 is a no no.


"Running 2 aerials like this is called co-phasing and you need a
special cable (a co-phase harness) to connect them, you can't just put
a splitter in the cable.

The aerials need to be a minimum of 7 feet apart, preferably 9 feet
apart, and when they are set up correctly, make the signal go out more
to the front and back of the vehicle and not to the sides, hence why
its popular with truck drivers on the motorway wanting to speak to
those ahead and behind them"
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PostPosted: Fri Jan 11, 2008 11:42    Post subject: Google Ads keep this community free to join!


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markymoan
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Joined: 25 Jun 2005
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Location: Naughty Step

PostPosted: Fri Jan 11, 2008 14:43    Post subject: Reply with quote

Thats why i only have one of mine wired up  Smile
Still its allways nice to carry a spare  Laughing
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mack
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Joined: 18 May 2008
Posts: 8
Location: Worcestershire

PostPosted: Sun May 18, 2008 9:58    Post subject: Reply with quote

Its not a special cable but it is a special length. You are trying to match two impedencances and the length of the cable is fundamental for that. In an ideal world you would have the two, for six or whatever antennas a wave length apart which is around 36 something feet but also in an ideal world you would use a 1/4 wave antenna which is around 9 feet so mobile use is all about compromise. Two co-phased antennas will give some gain over a single antenna on a vehicle, but only in certain directions and I doubt if all the hassle is worth it. Better off trying to use a longer antenna closest to a quarter wave length(9ft ish) mounted in the center of the roof for all round coverage.
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m0jfk
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Joined: 20 Oct 2009
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Location: St Helens Lancashire

PostPosted: Fri Dec 04, 2009 23:24    Post subject: Co-Phased Reply with quote

Yup Macks got it right on this one the truckers do use them because the way they set it up on the front it distorts the wave and makes it most bias to the front and up the motorway.
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