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Thread: Antenna Base

  1. #26
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    Re: Antenna Base

    Quote Originally Posted by farmersammm View Post
    Does that mean the antenna is two meters high? I guess it's a full wave antenna??? I don't know much about this kind of stuff.
    Yes, the example that you linked to is a full wave vertical 2 m antenna. They also make them in an array that can have elements that are full wave, half wave or quarter wave. The array helps boost the signal. Below is a picture of a 2 m array antenna. Ray will use some type of an array antenna like the one shown below. Iím not sure if it will be 1/4, 1/2 or full wave. The elements can be vertical as shown or horizontal.
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    -Don
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  2. #27
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    Re: Antenna Base

    Here is another vertical array.

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    Smith Oxyacetylene Torch
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  3. #28
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    Re: Antenna Base

    Quote Originally Posted by farmersammm View Post
    Does that mean the antenna is two meters high? I guess it's a full wave antenna??? I don't know much about this kind of stuff.

    Not necessarily. It could be anything from a 1/4 wave ground plane (about 19-20 inches in overall length) to a co-linear antenna like the one you linked to (two antennas in phase to achieve gain and a lower take off angle). 2 meters refers to wavelength of the band/frequency range, but its a generalization because the 2 meter band actually extends from 144 mhz to 148 mhz.

  4. #29
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    Re: Antenna Base

    Quote Originally Posted by farmersammm View Post

    Could very well be

  5. #30
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    Re: Antenna Base

    Looks like a great job.
    Like milling most time on site I see welding.

    Dave

    Quote Originally Posted by Don52 View Post
    My friend and customer Ray designed a base for a Ham radio antenna that will eventually be mounted on top of a school, which is the highest point in the area. I machined all of the components for the antenna base. The antenna will be used for a Ham radio repeater station. The school didnít want him to drill holes through the membrane of the roof, so it has to rely on weight and a large base to keep it from tipping over in the wind. The first step was to face and cut the stock to length.

    1. Cutting Off Stock 1
    Attachment 1727361

    2. Cutting Off Stock 2
    Attachment 1727362

    The next step was to set it up on the Bridgeport to cut the slot. I removed the chuck from the lathe and clamped it to the Bridgeport. Then I used a center finder to find the center of the stock so that I could zero my digital read out.

    3. Finding Center
    Attachment 1727363

    Next, I drilled the center hole undersize just to remove some stock. In hind sight I should have done this step while the base was still in the lathe. (It is easier to drill a hole with the 7-1/2 HP lathe as opposed to the 1 HP Bridgeport.

    4. Pilot Drilling Stock
    Attachment 1727364

    5. Drilling Stock
    Attachment 1727365

  6. #31
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    Re: Antenna Base

    Ray will use some type of an array antenna like the one shown below.
    I thought you said this was for a repeater installation? directional antennas like the ones you showed are typically not used for repeaters since they generally only radiate in one direction.

  7. #32
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    Re: Antenna Base

    ......troubles with editing...
    https://www.amazon.com/Radiowavz-Ant.../dp/B01M4NV336
    Attached Images Attached Images  
    Last edited by bead-boy; 05-05-2021 at 07:07 PM. Reason: .
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  8. #33
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    Re: Antenna Base

    Great post Don! I enjoyed reading it and admiring your craftsmanship.
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  9. #34
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    Re: Antenna Base

    Quote Originally Posted by Louie1961 View Post
    I thought you said this was for a repeater installation? directional antennas like the ones you showed are typically not used for repeaters since they generally only radiate in one direction.
    I asked Ray to clarify your point. You are correct. This antenna is an array type, which is directional. This array antenna connects to a computer and points to another omni directional antenna that is located on top of a chair lift tower on Ski Brule ski resort that is five miles away from the school. The Ski Brule antenna is the actual repeater. Thanks for your clarification.

    -Don
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  10. #35
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    Re: Antenna Base

    Thats some mighty fine machine work, well done.
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