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Screwdriver Plans?

Discussion in 'On the Road' started by WB9YTG, Apr 17, 2020.

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  1. WB9YTG

    WB9YTG Ham Member QRZ Page

    Looking for a copy of W6AAQ’s plans for a home brew screwdriver antenna.

    Years ago I picked up what looks like a disassembled screwdriver antenna at a ham fest. Have most of the pieces but not sure how it went together.

    any help would be appreciated. 73, Tom WB9YTG
     
  2. K5TEE

    K5TEE Ham Member QRZ Page

    Tom,

    Try this site for the instructions:
    http://k4poz.com/screwdriver.html

    Or this one:
    https://www.amateur-radio-wiki.net/screwdriver-antenna/

    Or this:
    http://files.f-a-r-e.webnode.it/200000079-98af999a88/W6AAQ_-_Screwdriver_mobile_HF_Antenna.pdf



    Tom
    K5TEE
     
    Last edited: Apr 17, 2020
    K0UO and WB9YTG like this.
  3. WB9YTG

    WB9YTG Ham Member QRZ Page

    Thanks and stay safe, 73 Tom WB9YTG
     
  4. WB9YTG

    WB9YTG Ham Member QRZ Page

    Update - Junk box special screwdriver...cobbled it together, probably not rugged enough for mobile use. Using W6AAQ’s notes as a guide. It’s tricky to tune manually, but I only have a 4’ whip right now...

    It’s a ‘Hamfest’ rescue, had to make the upper copper ring and find a screwdriver motor. Original builder used 1 1/4” PVC and 2” aluminum tube. Tunes 80/40/30 MHz. Surprised it doesn’t tune any higher. Manual control with a recycled model train controller (DC reversible/variable voltage) .

    Having fun with it. Any suggestions?
     
  5. WB9YTG

    WB9YTG Ham Member QRZ Page

    Made some contacts on 80! Narrow acceptable SWR bandwidth. 0228FEF4-88FF-4EA2-ADD4-59F4748D22F5.jpeg
     
  6. K0UO

    K0UO Platinum Subscriber Platinum Subscriber QRZ Page

    Good job, You just need a few radials to make it work!
     
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  7. WB9YTG

    WB9YTG Ham Member QRZ Page

    C1D7B718-4133-474F-ADDB-5BB64646D5EB.jpeg
    Improved the grounding with a cable to a cold water pipe.
     
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  8. WB9YTG

    WB9YTG Ham Member QRZ Page

    New question....my “MacGyver” homebrew screwdriver antenna works great on 80/75 (3.5 - 4.0 MHz), many QSO’s, however it won’t load on 40 and up...any ideas?

    Using an MFJ 259 antenna analyzer...it’s shows good resonances on 40 and 30 m, however my solid state rig thinks differently. Could it be the the aluminum tube that surrounds the coil?

    I can appreciate why the commercial versions of this antenna are so pricey.
     
  9. WA4SIX

    WA4SIX Ham Member QRZ Page

    Radials & a matching coil.

    Ed
     
  10. KF4ZGZ

    KF4ZGZ Ham Member QRZ Page

    Put a 1" diameter 1 " long ( 5-8 turns - maybe experiment or google screwdriver shunt coil) shunt coil on the feed point.
    The ends connect between the coax center connector and the braid (ground).

    Do a google image search it will tell you much more than I can explain.
     

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