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shakespeare 3 element beam

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  #9  
Old 12-27-2011, 09:11 AM
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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

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  #10  
Old 12-27-2011, 11:14 AM
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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"

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  #11  
Old 12-27-2011, 01:32 PM
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Sounds like someone made a beam out of mobile antennas.
- 'Doc

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  #12  
Old 12-27-2011, 06:48 PM
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Quote:
Originally Posted by Robb View Post
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.
Quote:
Originally Posted by W5LZ View Post
Sounds like someone made a beam out of mobile antennas.
- 'Doc

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.
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  #13  
Old 12-27-2011, 07:21 PM
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Smile shakespeare 3 element beam

Quote:
Originally Posted by tripple 5 View Post
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

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

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  #14  
Old 12-27-2011, 07:21 PM
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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.
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  #15  
Old 12-27-2011, 07:38 PM
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Quote:
Originally Posted by regencycb View Post
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

Another one that remembers them. 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.
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  #16  
Old 12-27-2011, 11:33 PM
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The 4104 version was earlier on forum :

swr problem 4104 beams

It migth be of use.

Kind regards,

Henry
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