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  • Running 2 aerials for UHF?

    Just wondering, is there any benefit in running 2 aerials with the one UHF (using a "double adaptor" for the coax)?

    Only reason I was thinking is you could have both a 3 and 6db aerial going at the same time to allow good hilly and flat reception...
    <Rob> '12 Prado GX - https://www.pradopoint.com.au/forum/general/my-rig-build-up/32702-i-m-back-with-a-2012-150-gx-toorak-tractor

  • #2
    Re: Running 2 aerials for UHF?

    i cant see any real advantage of running 2 antennas, why not run just a 4.5db to give you a midway between a 3 and a 6 db antenna, i run a 4.5 db and line of sight i can get 40km as the crow flies, im happy with that. cheers samo
    had an 03 gx 120 with some gear now got a 2013 bt 50 GT auto some ARB gear.

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    • #3
      Re: Running 2 aerials for UHF?

      My limited understanding is this. Leaving aside any issues with wave forming and signal problems this might cause, you don't get something for nothing, power wise. The 5 watts will be split across the 2 antenna, effectively giving simmilar output as using 2 x 2.5 watt sets and talking into 2 mics at the same time, one with a 3db and the other with a 6db.

      I would have the 2 antenna installed and just plugin the one suitable for the terrain your in.

      D
      2004 GX TD; Some extra stuff... and a big wish list...

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      • #4
        Re: Running 2 aerials for UHF?

        You are running into a minefield there.
        Antenna design and matching is a very black art - don't mess with it ! I am a radio tech. by trade and I don't mess with it.
        What you are suggesting will at best be worse than a single antenna, and at worst could damage your UHF.
        Cheers, Wayne

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        • #5
          Re: Running 2 aerials for UHF?

          I just screw in the aerial to suit the environment I'm in. I've got a good 6db RFI aerial for highway driving as well as a smaller 2.1db (I believe) rubber duckie style aerial for highly terrain, espcially where there is a lot of braches where the taller 6db aerial would get caught up in. With this smaller one I've found that receiption is lost in hilly terrain at about 8kms. I also have a very short 1/4 wave aerial that I mount to park the car in the garage as the other two are too tall for the rollerdoor and I don't want to leave the coax socket unprotected for two reasons. Water ingres to damage the connection as well as the potential to fry the transmitter.
          [COLOR=#000080]Nick[/COLOR]
          [URL="http://pradopoint.com/viewtopic.php?f=38&t=5308&sid=bcbebadd30673f1ac72047e6e8a93d79"]2006 TD GXL Evolution & Trips[/URL]
          [URL=http://www.fuelly.com/driver/Schaffer/prado][IMG]http://www.fuelly.com/smallsig-metric/45547.png[/IMG][/URL]
          [img]http://i929.photobucket.com/albums/mm286/Schaffer71/Avatar/CooperCreek.jpg[/img] [img]http://i929.photobucket.com/albums/mm286/Schaffer71/Avatar/BendlebyRanges.jpg[/img]

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          • #6
            Re: Running 2 aerials for UHF?

            There are a couple of options for running multiple AE's for the one unit.

            1. Choose AE's with a common mounting type. That way you can get out and screw off/on the AE of your choice dependent on terrain, purpose etc.

            2. Buy a switch box. These are small and can be mounted to your dash or somewhere convenient and use PL259 or standard BNC connections with a switch. These come in 1 to 2 and 1 to 4 connections with screw holes each end for mounting. That way you can mount 2 - 4 antennas perminately if you want and have them selectable from inside the vehicle.

            Something similar to this http://www.hardware-wholesale.com/d-p11 ... na_switch/

            Just in case you're not sure SO239 is a PL259 connector.

            Additionally, I carry a few spare PL259 metal caps to screw onto my AE mount when I have the antenna removed to prevent it getting fouled up or wet. I also carry Inox in my tool kit to clean the connection.

            Hope that helps as option 2 is what I intend to do at some stage.
            [b]2000 Prado RV6[/b] ~ TJM Type 15 Steel Bullbar ~ Uniden 400SX-RM & GME4702 Ant ~ Front Tow/Recovery Hooks ~ ARB Recovery Kit ~ ARB CKMP12 Air Compressor ~ DIY Rear Door Trim & Table ~ Extended Diff Breathers ~ Safari Snorkel ~ Wireless Reverse Camera ~ Iron Ox Full Length Roof Rack ~ Looong Wish List ...

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            • #7
              Re: Running 2 aerials for UHF?

              Thanks for the replies.

              Luckily I've got an antenna base that can suit a few tops. Running a 6db at the moment so might look into getting a 3db top to screw on.

              I suppose it's the cheaper of the options!
              <Rob> '12 Prado GX - https://www.pradopoint.com.au/forum/general/my-rig-build-up/32702-i-m-back-with-a-2012-150-gx-toorak-tractor

              Comment


              • #8
                Originally posted by RogueAussie View Post
                Re: Running 2 aerials for UHF?

                There are a couple of options for running multiple AE's for the one unit.

                1. Choose AE's with a common mounting type. That way you can get out and screw off/on the AE of your choice dependent on terrain, purpose etc.

                2. Buy a switch box. These are small and can be mounted to your dash or somewhere convenient and use PL259 or standard BNC connections with a switch. These come in 1 to 2 and 1 to 4 connections with screw holes each end for mounting. That way you can mount 2 - 4 antennas perminately if you want and have them selectable from inside the vehicle.

                Something similar to this http://www.hardware-wholesale.com/d-p11 ... na_switch/

                Just in case you're not sure SO239 is a PL259 connector.

                Additionally, I carry a few spare PL259 metal caps to screw onto my AE mount when I have the antenna removed to prevent it getting fouled up or wet. I also carry Inox in my tool kit to clean the connection.

                Hope that helps as option 2 is what I intend to do at some stage.
                Hi all,
                Nice forum, all tho it might be all irrelevant after 10 years of posting.
                Switch for the antenna selection is definitely the way to go. Running two antennas would be PHASED set up and it would require specific distance between two antennas ( to be specific half wave length) as well as some impedance matching at the main connection feed line as two resonant antennas of 50 ohms impedance wired in parallels will give you an swr of 2:1 which is far from ideal.

                SO239 is not a PL259 Connector,
                - SO 239 is commonly known as UHF Female Socket https://connectvk.com.au/product/uhf...rimp-for-rg58/
                - PL 259 is commonly known as UHF Male Jack https://connectvk.com.au/product/uhf...-rg213-lmr400/
                They are not the same. From the same family - yes but different genders.

                Comment

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