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shakespeare 3 element beam

Discussion in 'CB Antennas' started by tripple 5, Dec 26, 2011.

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  1. tripple 5

    tripple 5 Member

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    merry christmas and happy new year everyone.
    i have had this antenna now for about 7 years and never put it up and im now thinking about it. its 3 elmt with fiberglass radials and boom now i see you fella's have had ???? on the 4104 which is the 4 elmt im just wondering what the lenght of coax i need for the matching sect and if it is to be 75omh or can i direct feed it. im sure these were designed for a matching section so wondering lenght and what coax to use thanks everyone

    TRIPPLE 5 FROM THE COLD COUNTRY


     
    #1 tripple 5, Dec 26, 2011

  2. Se7en

    Se7en Well-Known Member

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    75ohm will work
     
    #2 Se7en, Dec 26, 2011
  3. Needle Bender

    Needle Bender ...he thinks it's funny that I stepped in it

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    is it a quad or yagi? i didnt know Shakespeare ever built beams. got any pics?
     
    #3 Needle Bender, Dec 26, 2011
  4. wavrider

    wavrider W9WDX Amateur Radio Club Member

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    Welcome to the forum.

    I have never seen any info on the Shakespeare yagi do you have a link?
     
    #4 wavrider, Dec 27, 2011
  5. tripple 5

    tripple 5 Member

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    i cant find any info on it sorry. the boom would ruffly 10' and each radial being 6'6" ruffly i can get exact measurements and their are 6 of them.
    i dont know if this can go vert or horz. it has a sticker on it and all i can read is shakespeare. i got it of a older fell that bought it 20-30 yr's ago im guessing and he never installed it after getting it he had health issue.
    so im just guessing here i would use ruffly 6' of 75omh coax for the matching section.thanks for the info and the welcomeing

    tripple 5 from the cold country
     
    #5 tripple 5, Dec 27, 2011
  6. tripple 5

    tripple 5 Member

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    sorry for got to mention it a yagi
     
    #6 tripple 5, Dec 27, 2011
  7. W5LZ

    W5LZ Crotchety Old Bastard

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    If your antenna is a yagi, three things on one side and three on the other, then it's a three element beam. As such, it typically won't need any matching device if one isn't furnished with it. It's also a common practice to use a coax choke at the feed point, simply several loops of feed line taped into a coil, then to the antenna's boom.
    If those 'radials' or elements are made from fiberglass, I have a feeling this is a 'home-made' antenna, I'm not aware of any commercially made beams made from fiberglass. If it's reasonably put to gether, then it should work. No idea how well, but it should still work.
    the best advice I can think of is to put the thing in the air and see just how it does work. Then go from there.
    - 'Doc
     
    #7 W5LZ, Dec 27, 2011
  8. Robb

    Robb Yup

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    Let's cut to the chase.
    Can you post up a picture of it here? I'm sure that all of us want to see it since no one has heard of it before.
     
    #8 Robb, Dec 27, 2011
  9. tripple 5

    tripple 5 Member

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    boom lenght is 121 3/4"
    element lenghts
    2@ 95 7/8
    2@92 3/4
    2@89 5/8

    the reason i ask about a macthing section is the the guy i got it from said it came with one. also these elements have the same kind of connector as a
    4' fiberglass whip as in meteal threads and from my understanding is that the driven elements should be seperate from each other so one side has the sheild and other has centre line of coax this one has a plastic insulator with a brass threaded fitting in it with no split in between that i can see.

    i tryed to load picture but it tells me i have to resize them and i do not no how to do that if some one can help with that ill post them asap.

    thanks again every one and i appreciate it. considering my lack of explaning
     
    #9 tripple 5, Dec 27, 2011
  10. Needle Bender

    Needle Bender ...he thinks it's funny that I stepped in it

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    those elements are even too short for a 10m beam unless they are internally loaded a little. the spacing is about right acording to k7mem 119 5/16

    27.2 MHz, 3 Elements, 4.824 dBd Estimated Gain

    The specified Boom Length of 121 Inches

    75.9 Degrees Horizontal Beam Width

    96.6 Degrees Vertical Beam Width

    1.25" Diameter, Metalic Boom with Bonded Elements. Boom Correction of 0.071 applied.

    Electrical Boom Length of 121.0" (10' 1"). Allow for overhang when cutting boom to length.

    0.25" (0-1/4") Driven Element Diameter.

    Warning: The Driven Element Diameter is Incorrect. The Driven Element Diameter should be between 0.434 (7/16") and 8.679 (8-11/16")

    0.25" (0-1/4") Parasitic Element Diameter.

    Suggested Stacking Distance for 2 Yagis:

    291.4" (24' 3-3/8") Horizontally

    229.1" (19' 1-1/16") Vertically

    1.302" (0") Dimensional tolerance required for element lengths.


    Antenna Dimensions









    Cumulative
    Spacing


    Element


    Element
    Length

    Zero


    REFL


    213-7/16"

    86-13/16"


    D.E.


    212-13/16"

    119-5/16"


    D1


    193-3/4"
     
    #10 Needle Bender, Dec 27, 2011
  11. W5LZ

    W5LZ Crotchety Old Bastard

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    Sounds like someone made a beam out of mobile antennas.
    - 'Doc
     
    #11 W5LZ, Dec 27, 2011
  12. Captain Kilowatt

    Captain Kilowatt Professional Amateur
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    Well it looks like i may be the only one here that ever heard of a Shakespeare beam before. I do indeed remember them and they were pretty much like six 1/4 wave mobile fiberglass whips mounted to a boom. Can't remember the matching section however. IIRC I may have some old Shakespeare sales brochures with one on it. It's late here right now and I work tomorrow but tomorrow night after work I will have a look but I DO remember a Shakespeare beam antenna. I think they made a three element and a four element beam.
     
    #12 Captain Kilowatt, Dec 28, 2011
    midnight special likes this.
  13. regencycb

    regencycb Member

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    I have seen a couple of these. It is indeed a factory made Shakespeare antenna. They were made produced in the years after the cb boom years
    I think around 78-88 era . The matching /balun section was part of the factory made harness consisted of a shorted stub and balun section made from coax sections and the ends were sealed with heat shrink tubing . On the end had a couple of terminal lugs that went to the driven element top and bottom whips. This same arrangement is used on there marine no ground plane cb antennas. They were fair performers but had a narrow bandwidth would work from ch 1-30 with less than 2to 1 swr. Your challenge is duplicating the harness/balun section. These were made in 3 ,4 element and a stacked 3 element model. Never were a great seller cause of the bandwidth ,at that era everybody was trying to cover the {new 40 + channels}. If you do not have any of the cable that came with it ,I would feed it with a 1:1 balun mounted on the boom close to the driven element feed the elements with short pieces of stranded #10 -14 wire with lugs attached that the 3/8 threads will pass through. Hope you can post the pictures they will help others see what your dealing with.


    good luck

    RCB
     
    #13 regencycb, Dec 28, 2011
    midnight special likes this.
  14. Captain Kilowatt

    Captain Kilowatt Professional Amateur
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    FOUND IT!!!!!!!!!!!!!!!!!!!!

    The three element beam was called a Star Beam and was model number 4153 and the four element beam was called the Megabeam and was model number 4104. I do not have a scanner but perhaps tomorrow night I can take a picture of the pamphlet and post that.


    BTW they also made a Polarbeam that was basically two three element beams crossed with one beam vert and the other horz. Model number 4154.
     
    #14 Captain Kilowatt, Dec 28, 2011
    midnight special likes this.
  15. Captain Kilowatt

    Captain Kilowatt Professional Amateur
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    Another one that remembers them. (y) Yes the hard part would be finding the feedline section which was as you described. I agree about the 1:1 balun instead. You also have to jumper the two sections of the director and reflector across the mounting hub in order to make contact. A simple short piece of copper braid with lugs is good ,in fact that is what Shakespeare used.
     
    #15 Captain Kilowatt, Dec 28, 2011
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