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Thread: My multiband

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    My multiband

    Well my bad stretch has continued as I try to find a good aerial.

    Last night I made another 4:1 unun as per my design in the article I posted and popped it onto a wound antenna, also as per my article. Instantly the little kx1 set a 1:1 SWR on all the bands it can (80,40,30,20) and I saw max power out on 80 (4 watts) and good power on all the others, down to 2.5 watts on 20m.

    Basically, of all the aerials I have tried THIS aerial is the best by far.

    Of course, SWR is only one point, the major point is "does it work?". Well using this aerial and a variety of powers from 100w to 1 watt from home I have worked the globe: right down to VK, ZL and China...whatever that is.

    If you havent tried these aerials I would urge you to do so. I have made mine portable so I dont need to wrap the wire afresh every time, YMMV. The unun is easy (but I will sell you one if you need one).

    The whole aerial shoudnt take you too long or too much to make so I hope you have a bash. Again, if you need one making I will sell you a complete aerial, pole and unun.
    Im about to commence tests without the pole. How? Watch this space!!!


    David

    G4YVM

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    WD5IKX (2nd Aug 2015)

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    Re: My multiband

    Hi David

    I just finished the mix 26 unun.

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    Can you supply any additional details about the antenna and how you deploy it?

    John
    WD5IKX

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    Re: My multiband

    John,

    Wind the wire onto the pole exactly as per the details in the article. http://www.arpoc.org/content/135-mul...enna-easy.html The pole MUST MUST MUST be glass fibre and NOT NOT NOT carbon. We us 7m poles but but 10m ones work as well. Any glass fibre pole will do.

    Deployment can vary: some use a stand-in drive-on pole holder like this http://www.ebay.co.uk/itm/Wheel-Base...item46124c3b08, others knock a stake into the ground and use cable ties to fasten the pole base.

    Whilst one can wrap and unwrap the wire everytime (and it only takes a few minutes of tedium) I actually engineered a method whereby I can leave it all ready to go and it's deployable in seconds. Thats up to your ingenuity.

    Feed the radio via coax to the unun, pop the aerial wire on the hot output and you need NO earth line.

    Good luck.

    D

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    Re: My multiband

    Hi David

    My mix 26 UnUn is working great and thanks for the tip about them. I have been using 85 feet of .8mm copper weld wire strung up in inverted V fashion with a 50 foot counterpoise laid on the ground below it and I have been extremely happy with the performance of this antenna. It loads on every band 160 through 10 meters. I have talked all over the US and had some great DX contacts to Australia and Europe using only 50 watts. I have used this antenna for two portable outings so far and I expect to use it for many more.

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    73

    John WD5IKX
    Last edited by WD5IKX; 19th Jul 2015 at 20:28.

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    Re: My multiband

    Well done John. Hope I work you one day
    D

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    Re: My multiband

    Have you tried any other configuration. I have a 12m pole but was also thinking horizontal. I may of missed it but is there a recomended coax length.
    À la perchoine

    Jes

    G-QRP 10080 - RSGB - ARRL

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    Re: My multiband

    My first Mix 26 UnUn worked so well I am building more. T130-26 with #18 wire and T175-26 with #14 wire. I hope they work as well as my first.

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    I will update as I finish the build and try them out. Gives me something to do while the band conditions are less than stellar. (o;

    John WD5IKX
    Texas USA
    Last edited by WD5IKX; 28th Jul 2015 at 00:26.

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    Re: My multiband

    I finished another Mix 26 UnUn and it turned out well. I did a quick check with around 25' of wire wound around my 8 meter "Squid Pole" with a 50' run of RG8X with a choke at the tuner and was able to get <1.2 on 40, 30, 20, 17, 15, 12, 1nd 10 meters without any counterpoise. 80 meters the match was not quite as good but it may work better with a counterpoise or radials. I did not make many QSOs due to poor band conditions at the time and it was 105° F (40.5°C) so I scurried back inside to cool off. I am making another trip to Ft Griffin SHS next week so I will test it with some radials.

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    Making these things is fun! (o:

    John WD5IKX
    Last edited by WD5IKX; 8th Aug 2015 at 17:10.

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    Re: My multiband

    I see S9 are using 4:1 unun's for multi band operation.
    À la perchoine

    Jes

    G-QRP 10080 - RSGB - ARRL

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    Re: My multiband

    Quote Originally Posted by mu0chn View Post
    I see S9 are using 4:1 unun's for multi band operation.
    Yes, I've got an S9v18 and a 4:1 unun. It works well and the internal tuner in my Omni VII can tune it from 40 meters up to 10 meters. My external LDG Z817 tuner can also tune it over the same range for use with my FT-817nd. I'm sure it isn't at all efficient on 40 meters given it is only 18' but it does tune. I have made a QSO from my QTH near Chicago to Los Angeles (over 2000 miles) on SSB with my FT-817nd at 5 watts. I got the S9 from Cheapham.com for only US $35 (that's what, maybe 30 euros or 28 pounds?). The unun purchased new was $27.

    I've had so much success with it I'm thinking of building one 31 feet long for 40 meters and up.
    --Sherman AA9SD

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