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Built an Astroplane in an afternoon.

Discussion in 'Home Brew' started by HomerBB, Jun 2, 2011.

  1. HomerBB

    HomerBB Sr. Member

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    I put this together in about 4 hours because I wanted to see what results could be had from such a thing. First time up the SWR on 40 is 1.4:1 and on ch1 it is 1.9:1. Talked and receives just fine. More later. Gotta go back to work.

    [​IMG]

    All the weird curves is my camera doing strange things again? ? ?


     
    1 person likes this.

  2. HomerBB

    HomerBB Sr. Member

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    Materials for Quick AP:

    [​IMG] [​IMG]

    The bottom ring assembly"

    [​IMG] [​IMG]

    Coming together:

    [​IMG] [​IMG]

    More tomorrow.
     
  3. awesome (y)(y)(y)
     
  4. SmackDown

    SmackDown Active Member

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    what are the materials you're using ?


    3's
     
  5. HomerBB

    HomerBB Sr. Member

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    CPVC tubing and PEX tubing for the ring. Covered with Aluminum tape.
     
    1 person likes this.
  6. HomerBB

    HomerBB Sr. Member

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    Worked on it little more. I had the top bracket too wide, so I replaced it with sturdier aluminum stock (second u-clamp wasn't on it yet in the photo), and adjusted the width a little more at the mid bracket. SWR is closer now - on ch40 1.2:1 and on ch1 1.4:1.

    Getting there. I probably won't make this a keeper, just a for funner. I'll likely let it go to a friend for cost of parts. Just a little more . . .

    [​IMG] [​IMG]

    [​IMG]
     
  7. HomerBB

    HomerBB Sr. Member

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    A little more tinkering done. SWR 1.1:1 at 40 and 1.

    Some contacts a few minutes ago with bottom ring mounted 20' in the air.

    3030 --------------------------------- 26.695 AM NC
    7440 --------------------------------- 27.385 LSB
    WR077 ------------------------------ 27.385 LSB GA
    206 ---------------------------------- 27.385 LSB TN
    619 ---------------------------------- 27.385 LSB KY
    662 ---------------------------------- 27.385 LSB Lake Erie
    Rusty Nail ------------------------- 27.125 AM

    Others I didn't write down.
     
  8. Marconi

    Marconi Usually if I can hear em' I can talk to em'.

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    Way to go Homer.

    Where did you mount it? Were you able to compare (switch) it to anything else at a particular moment in time.
     
  9. HomerBB

    HomerBB Sr. Member

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    No I can't switch off to anything else right now.

    It's about 40 feet or more away from the mast the Qv4k and Yagi are on mounted on a layover pole 20' tall.

    I may get it on the mast later, but we'll have to see.
     
  10. airplane1

    airplane1 W9WDX Amateur Radio Club Member

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    Very nice
     
  11. hotrod

    hotrod Well-Known Member

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    sweet. i,ll be waiting for more info on this
     
  12. HomerBB

    HomerBB Sr. Member

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    I'll likely be turning it over to a friend who needs an antenna. He'll either buy aluminum tubing to add durability, and pay me for the current costs, or just pay me what the materials cost in it as is.
    Before then, I'll play with it a few days.
     
  13. HomerBB

    HomerBB Sr. Member

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    One of my purposes in making this AP was to show that an antenna can be done on a very tight budget that performs admirably well. Everything on this antenna was purchased at Home Depot. Some things, like the roll of tape, and the aluminum flat stock, cost more than the figures to purchase, but the cost is prorated to reflect the amount of each that went into the project. While i might would replace the tubing with aluminum tubing if I wanted maximum durability over the long haul, that in no way means that this homebrew AP is taking a backseat to any other antenna performance-wise for those who need a budget product.

    cost of materials:

    top hat rods ----------------- 4.00
    aluminum plate ------------ 3.50
    u-bolts ------------------------ 5.00
    screws ----------------------- 0.75
    PEX tube --------------------- 2.50
    CPVC tubes ----------------- 4.65
    CPVC tees ------------------- 2.00
    Aluminum tape ------------- 2.00
    3/8"x4' fb rod ----------------- 1.00
    ________________________
    total ---------------------------- 25.40

    The center mast pipe is what ever mast you use. I already had it and the fellow who gets this antenna will get his own or pay me to replace the pipe i have.
     
  14. Superidgit

    Superidgit Active Member

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    Sweet work Homer!!! (y)

    Even if the person that gets this item does not go with something more rugged, it certainly would not be very much to repair or replace the entire thing. :laugh:
     
    #14 Superidgit, Jun 4, 2011
    Last edited: Jun 4, 2011
  15. HomerBB

    HomerBB Sr. Member

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    Thank you, Sir.

    Set up outside under my umbrella (too #&*#$^@%$ hot otherwise) I put the MFJ209 and the frequency counter in lline and this is what it says.

    2.0:1 ------------------------ 29.695
    1.0:1 ------------------------ 27.875
    1.1:1 ------------------------ 27.405
    1.2:1 ------------------------ 27.205
    1.5:1 ------------------------ 26.695
    2.0:1 ------------------------ 26.415

    The setup testing:

    [​IMG]
     

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