Build it: 2 meter Tape Measure Yagi Antenna

Discussion in 'Amateur Radio News' started by KB9VBR, Feb 7, 2017.

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  1. WQ4G

    WQ4G Ham Member QRZ Page


    Hopefully you are not just laying the disconnected coax line on the floor of the shack (with an open end). I used to do that - until a lightning strike took out my radio, amp, computer, refrigerator, telephone, stereo, and every other electronic device in the house. I even had one light bulb (in the lamp on my radio desk) that had a hole blasted in the base. When the lightning bolt hit the antenna and came down the coax it had no place to go. So it punched a hole in the braid and jacket of the coax about every 12 inches and came out all over the place and took the closest path to ground - through all my electronic stuff.

    Now days I have a ground bar in my shack with coax connectors welded to it and I screw all my coax lines to that. When lightning hits it goes straight to ground. In fact, I believe I have taken several direct hits to my antennas, over the past 20 years, with no ill effects. Now I am almost convinced my antennas, grounded in this fashion, keep the lighting away from the house and appliances.

    I would warn against just disconnecting your coax lines and letting them lay ungrounded on the floor of the shack... IMO you are asking for trouble. As I said at the beginning of the post - I hope you are not doing that.

    Dan KI4AX
    WA7PRC likes this.
  2. WA7PRC

    WA7PRC Ham Member QRZ Page

    Lightening the discussion with more lighting, I b'lieve the word missed (twice) is lightning. ;):p:rolleyes:
  3. KB9VBR

    KB9VBR Ham Member QRZ Page

    Glad you enjoyed the video. It's my experience that new hams are looking for easy tutorials like this. With a lack of mentors at the local level, they are turning to places like Youtube for inspiration and help.

    As for the snow; well, we Wisconsin hams aren't gonna let a little bit of the 'white stuff' keep us indoors. :)

  4. KC8WIK

    KC8WIK Premium Subscriber QRZ Page

    Gees, he kinda looks like Adam Savage of the Mythbusters!o_O
  5. KQ7T

    KQ7T Ham Member QRZ Page

    Michael, great post. Thank you.

    I recall during my visit a few years ago to the air and space museum near Dulles, VA, seeing satellites sporting tape measure antennas. The reason was obvious. They are fully collapsible for launch, then require no assistance to fully deploy once in orbit. "Gosh, that's clever," said I to myself. I wondered if the idea came from a ham operator.

    In the case of your antenna, portability is just about optimum. Very nice.
  6. WD9EWK

    WD9EWK Ham Member QRZ Page

    It did. Hams have used tape measure pieces as antennas on many different satellites.

    The satellite you saw at the National Air and Space Museum annex at Dulles Airport was probably the PCSAT-1 (NO-44) satellite model on display. It was built at the US Naval Academy, a project led by Bob Bruninga WB4APR, and the satellite is still in orbit and occasionally operational. More about that satellite is at:

    I saw it there in 2014, but don't have those pictures with me. That link has photos of the satellite before its launch.

    When the satellite gets enough sunlight, its 145.825 MHz packet digipeater will come alive - sort of. Most times, it may get enough solar power to send a packet beacon or two when it is overhead in daylight.

  7. WA6AM

    WA6AM Ham Member QRZ Page

    With so many vids on the ZED, I'm wondering if they have time to OPERATE anymore. All that production time and all.
    Great vid and good luck with the program. I'm sure it helps folks out just fine.
    Best 73 and keep it going. Now go call CQ!
  8. KF7PBM

    KF7PBM Ham Member QRZ Page

    Thanks for the video Michael ... some people learn a lot better visually rather than by reading a book! Good job! 73
    AF7EC likes this.
  9. W8GMD

    W8GMD Ham Member QRZ Page

    Hello Mike. Tnx for the video. I'm going to make one like you have shown then I think that will get me to make a Yagi for 2m from conduit or copper pipe for a higher wattage. Your instructions are easy to follow and precise. 73 to you.
  10. M3ZKB

    M3ZKB Ham Member QRZ Page

    very neat and simple to set up nice one ,regards,ken,m3zkb

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