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Building 102' vertical Antenna for 11 meters...

Discussion in 'Home Brew' started by T23, Nov 8, 2010.


  1. T23

    T23 Active Member

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    Well the antenna is going to be mounted to the roof , the tripod is just for testing... I'll try some different suggestions and post pics later and results.

    T23
     
  2. crmzendrgone

    crmzendrgone CB newbie

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    Any progress on the antenna?
     
  3. crmzendrgone

    crmzendrgone CB newbie

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    Don't mean to thread jack but am I reading this right.

    Instructions


    Things You'll Need:

    • TV coaxial cable Pocket knife Antenna insulators Coaxial connector Rope
    1. <LI id=jsArticleStep1 sizset="2" sizcache="575" itxtvisited="1">1
      [​IMG] Coaxial cable stripped to reveal each layer.
      Strip the outer insulation from 102 inches of coaxial cable using a pocketknife. Be careful not to damage the metal braided shield that lies beneath. The total length of your cable depends on the distance you anticipate running it back from the antenna and to your CB.
      <LI id=jsArticleStep2 itxtvisited="1">2
      Pull the coaxial cable metal braided shield down the length of the stripped end of the wire.
      <LI id=jsArticleStep3 itxtvisited="1">3
      Push open a hole in the braided shield, and pull the inner wire out through it. You should now have a "Y" made up of the original, unmodified cable, the braided shield and the inner wire.
      <LI id=jsArticleStep4 itxtvisited="1">4
      Attach antenna insulators to both ends.
      <LI id=jsArticleStep5 itxtvisited="1">5
      Check the total length and tie both ends together. With two 102-inch sections, you will have a 17-foot loop. Seventeen feet equals 1/2 wave, which is ideal for CBs.
      <LI id=jsArticleStep6 itxtvisited="1">6
      Tie a string or rope to one end, and haul the antenna up a tree. The length of this rope will depend greatly on how high you are pulling your antenna, but it needs to be at least 20 feet long to get the entire antenna off the ground. Avoid using a metal pole for this, since it will interfere with reception.
    2. 7
      Plug the open end with the coaxial connector into your CB radio and start transceiving.

    Read more: How to Build a CB Antenna | eHow.com How to Build a CB Antenna | eHow.com

    ????
     
  4. wr367

    wr367 ScadaTech

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    1/2 inch EMT (1) vertical radiator and (4) horizontal ground plane equally spaced 90 degrees. Ground plane should be about 3-5% longer than radiating element. A matching device will be needed.
     
  5. wr367

    wr367 ScadaTech

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    I have used a similar setup with 1/16" steel cable (any wire will work) in an inverted V. Very easy to setup and pull down. Adjusting the angle will give you some impedance matching capability. Very inexpensive alternative
     
  6. T23

    T23 Active Member

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    Actually I have scraped this project and have been experimenting with dipole antennas.


    T23
     
  7. HomerBB

    HomerBB Sr. Member

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    Dipoles are an easy, and fun, alternative to more complicated antenna building, but if you get interested again, it's as simple as this:

    [​IMG]
     
  8. HomerBB

    HomerBB Sr. Member

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    Dipoles are an easy, and fun, alternative to more complicated antenna builds, but if you get interested again it's as easy as this:

    [​IMG]
     
  9. crmzendrgone

    crmzendrgone CB newbie

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    Ok. Well I would like to make a Dipole. how can I make one?
     
  10. T23

    T23 Active Member

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    A dipole is mostly for fixed location stations... Its very easy, the way I built mine is I took 2 110 inches of thick speaker wire and striped one end of each wire and then stripped the coax's black casing and then twisted the braid together after separating it. Then what I did was strip the white or clear plastic inner casing to reveal the copper center wire. Next I soldered one speaker wire to the center of the coax and then the other speaker wire to the braid. After that you need to seal up those connections and make sure there isolated from each other and then sealed up both connections. What you do next is hang it up and put the wires in a 90* angle and trim or fold back the ends of the wire inch by inch till you get the best SWR.


    T23
     
    #26 T23, Jan 20, 2011
    Last edited: Jan 20, 2011
  11. HomerBB

    HomerBB Sr. Member

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    There are several different ways of making a dipole. The simplest of them are two equal lengths of wire roughly 8.5' long joined in the center with a strong center support that forms the joint between the two wires, At this point you fasten the two wires to the coax. The shield of the coax goes to one wire, the center conductor to the other. Make the two wires as long as 9' each and fold back the ends equally until you get a good SWR - 1.5:1 or less is very good, but 2.1:1 is acceptable.

    [​IMG]


    My experience is that the best dipole build for hanging from a tree is one that feeds from the end because the dipole works best as a vertical for CB communications due to most CB antennas, esp mobiles, are set up vertically. To make this one you peel back and remove 9' of the outside insulated coating from the coax. Next you push backward toward the coating left on the coax the braided shield that was revealed by peeling back the coating you removed. When you've gotten sufficient slack in the braid roll the braid back over the coax outside insulation so that you have the inner conductor and its insulation going one direction, and the braid over the main coax going the other direction. To adjust for proper SWR trim the braid and the inner conductor equal amounts until the best match is obtained.

    [​IMG]

    In this picture the shield element is replaced by a metal tube, but it still illustrates the make-up and function of the braided shield pulled back over the feedline coax.
     
  12. crmzendrgone

    crmzendrgone CB newbie

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    I have some questions about this information. I am at work but will ask them later. THANKS, Josh
     
  13. crmzendrgone

    crmzendrgone CB newbie

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    Ok for the dipole what kind of wire, rather what gauge wire should I use. and for the center piece can I use what like pvc pipe or something? And what am I pealing back to get the right SWR the braid, the outer sheath???
     
  14. crmzendrgone

    crmzendrgone CB newbie

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    I found this

    160 Meter Dipole Antenna at W5JGV

    can this idea be applied to 11 meter? If so why does he have 2 wires coming off the antenna to the house?
     

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