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Thread: Ugly Balun

  1. #1
    Membership #: 10 Free member mu0chn's Avatar
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    Jes
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    Ugly Balun

    Hi has anyone made an ugly balun with the winding on the inside of the PVC pipe. This is for use at home so it needs to be as neat as possible. In the pipe will be a 9:1 unun and the coax coil then sealed.
    À la perchoine

    Jes

    G-QRP 10080 - RSGB - ARRL

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    Membership #: 46 Free member WD5IKX's Avatar
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    John Love
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    Re: Ugly Balun

    Here is my "Ugly Balun" that I use with most of my portable antennae. I drilled small holes so I could anchor the first and last winding with tie wraps and then used electrical tape to hold the windings in place.
    I have never had stray RF problems even when using 100 watts.

    Click image for larger version. 

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    "Crude but effective" (o:

    John
    WD5IKX

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    Membership #: 87 Free member M0PZT's Avatar
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    Re: Ugly Balun

    Yes, and they're not very good - unless you build it according to your carefully-calculated sums! If you're aiming for a mostly resistive choke for general HF use (given that you've got a 9:1 at the end), then you would fare better with 8 turns of coax on an FT140-43 or FT240-43 toroid. Have a look at G3TXQ's charts - the black lines are where you want to be: http://www.karinya.net/g3txq/chokes/ As you'll see, if you are interested in working down to 3.5MHz, an FT240-31 would be a better choice.

    The money you'd save on all that coax would pay for the (more effective) toroid

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    Re: Ugly Balun

    Another nudge towards G3TXQ's chart. I've always had good results using it.
    Matt - M0LMK


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    Re: Ugly Balun

    Quote Originally Posted by M0LMK View Post
    Another nudge towards G3TXQ's chart. I've always had good results using it.
    There is a lots of good information on his site.

    John
    WD5IKX

  7. #6
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    Re: Ugly Balun

    I am going to use 52' 6" of wire from my window across to the far end of the lean to. Will have to experiment with the counterpoise. I do not plan on using much power so with a bit of luck I won't upset the other residents.

    À la perchoine

    Jes

    G-QRP 10080 - RSGB - ARRL

  8. #7
    Membership #: 10 Free member mu0chn's Avatar
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    Re: Ugly Balun

    Quote Originally Posted by M0PZT View Post

    The money you'd save on all that coax would pay for the (more effective) toroid
    I have had a look but it is getting hold of the toroid and I have the coax to hand.
    À la perchoine

    Jes

    G-QRP 10080 - RSGB - ARRL

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