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Antennas

Portable 3 EL 70cm Band Yagi

Hello everyone. Want to share my recent project of 3 el yagi for 70 cm band. It’s very light, portable and great for backpacking and hiking.
I like to hike and want to have only necessary equipment with me. I have decent portable equipment for HF which is IC-703+ and set of J-pole antennas.
Many HAMs use a small handled VHF/UHF radios but unfortunately the original antenna is very bad and not efficient. It cause bad communication or radio overheating.
I decided to make one antenna that I can handle and have with me every time when I hiking or backpacking.
The antenna should be:

  • – light
  • – small or foldable
  • – have a good performance

Finally I found a solution and made this antenna. It met all my criteria. I got a ultralight, foldable and portable pocket size antenna with decent performance.

Frequency: 436.00 – 445 MHz with SWR 1:1.5 – 1:1:1.5 and 1:1.1 on 440 MHz.

Gain: 7 dBd 

Weight : less than 12 oz

I used a material that had in my garage, there is nothing special or expensive. The boom is a simple fishing rod that I bought  on eBay for HF projects. The antenna elements made
from 1/8″ (3.18 mm) brass rod. You can find them from K&S Engineering store. Simply drill a two holes, one for reflector another for director. The driven element can be just zip tied to the boom.
The important step is tuning. At least you have find a position of driver element whenever you get a lowest SWR on central frequency (the antenna can be tuned ether for SSB or FM). Personally I use this particular antenna only for FM, repeaters and satellites. As you can see on photo, I’d attached my cheap chinese radio directly to the boom.

 

3 EL YAGI 70 CM BAND

3 EL YAGI 70 CM BAND

Download in high resolution here or in PDF

Feel free to ask me if you have questions.

73,
Alex K6VHF

Discussion

4 Responses to “Portable 3 EL 70cm Band Yagi”

  1. Alex,
    The image for the yogi doesn’t load as the is too high for your hosting provider – maybe you can mail it to me?
    73 es merry Xmas!
    Willi OE1WKL

    Posted by Willi | December 23, 2014, 2:25 pm
  2. Hi,
    The DE is a folder dipole. Should a 4:1 balun added to the feed point?

    Posted by Jeff | December 10, 2015, 5:29 pm
  3. looks great
    how about cris crossing two orings to secure the beams

    let us know how your dual band project is going
    i would like to build one myself

    73

    Posted by sven | February 19, 2016, 5:04 pm

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