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Thread: 144Mhz yagi designed for backpacking portable.

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    144Mhz yagi designed for backpacking portable.

    I've just finished a 9 element DK7ZB 144Mhz long yagi designed especially for backpacking portable.
    Nearly all my operating is done portable but it used to be from drive on sites and the yagis on a roof rack. With LiFePo4 batteries and FT-817s around now I plan to operate from my favourite summit that I have always had my eye on.
    So needing to pack a yagi down to carry really meant the elements coming off. Usual method of screwing elements on is slow and time consuming so I got the thinking cap on and the 3D CAD out and designed (mechanically) a way to achieve this simply and easily.

    Finally finished now and glad to say I can fit the 9 elements in 90 seconds.



    Video fitting the elements:
    https://youtu.be/oUqktapm10g

    Full description is here
    http://g1ybb.uk/portable-9-element-1...7zb-long-yagi/
    Steve G1YBB
    http://g1ybb.uk

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    M0LMK (12th Apr 2016)

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    Re: 144Mhz yagi designed for backpacking portable.

    Very nice job Steve.

    How does it perform?
    Matt - M0LMK


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    Re: 144Mhz yagi designed for backpacking portable.

    Seems to work pretty good. Used it in the UKAC last week and looking at claimed scores 2 more UK squares that I should not have missed would have given me top spot in my section.
    Very pleased with it
    Steve G1YBB
    http://g1ybb.uk

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    Re: 144Mhz yagi designed for backpacking portable.

    Very good. I like your method of mounting the elements. Very quick and easy.

    Great that you can supply the element mounting plates and I see the guy ring which also looks good. May have to add a few of them for my 12M pole!

    Shame that company doesn't produce your HF wire dipole spools.
    Last edited by M0LMK; 13th Apr 2016 at 07:55.
    Matt - M0LMK


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    Re: 144Mhz yagi designed for backpacking portable.

    Quote Originally Posted by M0LMK View Post
    Very good. I like your method of mounting the elements. Very quick and easy.

    Great that you can supply the element mounting plates and I see the guy ring which also looks good. May have to add a few of them for my 12M pole!
    I'm hoping to re-use the element plates for future projects. They would certainly be big enough for 28/50/70MHz yagis I reckon, if there are clips out there to suit the elements.
    For the 10mm elements when not windy you probably don't need to snap the locking 'flap' closed. That does add a tiny bit more pressure on the elements. All in pleased how it turned out.

    And the guy rings. The plastic is amazingly strong really. It's used in some medical application where they things go through the autoclave many times through their life. Quite easy to drill out the 20.5mm hole bigger with a step drill for bigger poles, or would file easily. I leave the rings and guys tied to them on the mast (the red bag in picture above contains the top two sets, bag is just for containment and protection for the guys) makes it pretty quick to deploy.
    If you do get some be cool to see some pics of them in action.
    (disclaimer-I make no money from any sales. My 'reward' is getting just what I want for my projects for free)
    Steve G1YBB
    http://g1ybb.uk

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    Re: 144Mhz yagi designed for backpacking portable.

    dug up some pics from the trial UKAC contest on the 5th.

    The entire setup carried solo:



    Setup


    Sunset
    Last edited by G1YBB; 15th Apr 2016 at 19:23.
    Steve G1YBB
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    Re: 144Mhz yagi designed for backpacking portable.

    Quote Originally Posted by M0LMK View Post
    Shame that company doesn't produce your HF wire dipole spools.
    Just spotted this edit.
    Interesting comment, I expected to be in the minority not liking the kite style winders for the wire.
    The wire spools are downloadable if you have a 3D printer, which is how mine were made. Injection moulding tooling for them would be a fairly expensive investment if take up was low.
    Steve G1YBB
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    M0LMK (10th May 2016)

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    Re: 144Mhz yagi designed for backpacking portable.

    I don't have a 3D printer but would be happy to buy a couple of printed ones
    Matt - M0LMK


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    Re: 144Mhz yagi designed for backpacking portable.


    I'll see what I can do.
    Steve G1YBB
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    Re: 144Mhz yagi designed for backpacking portable.

    Ordered some of your element holders Steve.

    Now I just need to find somewhere local to pick up a 3M length of 20mm x 20mm box section....
    Matt - M0LMK


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