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2m V4k

Discussion in 'Amateur Radio Antennas' started by HomerBB, Apr 20, 2018.

  1. HomerBB

    HomerBB Sr. Member

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    Homebrew 2 meter Vector 4000 in progress. Put it up 21' and QSO'd local for first check on it. Simplex FM 146.520 Mhz contact 16 miles apart got good reports on 5 watts and 100 watts out. S4 on 5w, s9+ on 100w. Receive was good, too. S3 on my IC-746 other station transmitting at 5w, S9 other station transmitting 100w. SSB was clean and strong.
    I have some refinement of the components but well pleased so far.

    20180419_140600.jpg 20180419_192429-01.jpg


     
    #1 HomerBB, Apr 20, 2018
    Last edited: Apr 20, 2018

  2. HomerBB

    HomerBB Sr. Member

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    Had a few minutes to wrangle with this antenna before dark today. Improved the feedpoint to make it more stable. Experimented a little with another gamma match.
    At the moment SWR is:
    1 6:1 -----144 Mhz,
    1.5:1 ----- 145 Mhz,
    1.4:1 ----- 146 Mhz,
    1.3:1 ----- 146.52 Mhz,
    1.3:1 ----- 147 Mhz,
    1.3:1 ----- 148 Mhz.

    20180427_195727-01.jpeg
     
  3. w9cll

    w9cll W9WDX Amateur Radio Club Member

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    Awesome work!
     
    HomerBB likes this.
  4. 543_Dallas

    543_Dallas Sr. Member

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    Very cool. Any plans for a 160m version? :)
     
    binrat, davev8 and Road Squawker like this.
  5. HomerBB

    HomerBB Sr. Member

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    Ah, sure. Maybe tomorrow... ;)
     
    AudioShockwav likes this.
  6. rigmo

    rigmo New Member

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    Hi all, Hi 2 for HomerBB
    Im looking for good antenna for my fm experiment... and all my search leeds me to vertical antena; Vector dominator... exterminator antenna, meany different names but the same type.. to meany fights between suppliers..?!
    I find one supplayer 200km from me... I write him but answer was.. contact guy from USA ( 100000km..) insane..! we do not business with private person.. !

    I see meany home projects And Im intrested build my Owen, ITs more chiper... but I do not anything.. ... any details... I se meany photos... angles diameters... etc etc..

    Can you help me to build my own VECTOR for FM BaND

    Thank You in ADVANCE
    BEst REgards
     
    Shadetree Mechanic likes this.
  7. HomerBB

    HomerBB Sr. Member

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    Howdy, Rigmo.
    When I built this little antenna I did not have a resource for dimensions. I attempted to scale the 2m version directly from an 11m model.
    Here are some measurements to start with. But, I will caution that the thing is temperamental to small changes and will move rapidly away from a good tune in a hurry.
    I got mine to work, then moved on to other things so never locked down anything to replicate exactly.

    Where I started..

    2m
    Length - 62.125" (40" w/CH 10")
    Radials - 20"
    Ring - 5.647" diameter
    Gamma rod - 10"
    Gamma body - 5"
    1-5/8" radials attached from bottom

    Modifications:
    2m
    57.6" vertical
    19.2" radials
    17.5" hoop circumference.
     
    Shadetree Mechanic likes this.
  8. rigmo

    rigmo New Member

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    I see and understood your point, sensitivity.
    how you get ring diameter ? lambda ?
    On some portal i read angle is 14°
     
    #8 rigmo, Jan 13, 2019
    Last edited: Jan 13, 2019
  9. rigmo

    rigmo New Member

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    I see and understood your point, sensitivity.
    how you get ring diameter ? lambda ?
    On some portal i read angle is possible 14°
     
  10. HomerBB

    HomerBB Sr. Member

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    I just went at it in a straight forward scaling effort.
    Don't know whether my dimensions were/are correct.
    Used antenna calculator to find difference between the lengths of each vertical, the 27mhz antenna is 5.35x the 146.52mhz antenna length. Divided the 11m ring diameter , 30", by 5.35 for 2m ring diameter of 5.6".
    I used that formula for all dimensions then experimented for modifications using analyzer.
     
    Shadetree Mechanic likes this.
  11. Shadetree Mechanic

    Shadetree Mechanic 808 On The North Side of Dover

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    binrat likes this.

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