1. You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.

Any Astro Plane Fans ?

Discussion in 'CB Antennas' started by tuner, Dec 13, 2014.

  1. HomerBB

    HomerBB
    Expand Collapse
    Sr. Member

    Joined:
    Jan 4, 2009
    Messages:
    2,864
    Likes Received:
    617
    I know this is the AP thread... but it does have crooked radiator and matcher tubes. ;)

    I worked with it more following encouragement from my neighbor and got it resonant across the whole 2m band. It is 1.2:1 @ 144Mhz & 148Mhz with 1.0:1 @ 146 Mhz.
    I'll share the dimensions should anyone want them on another thread.


     

  2. Oscar Goldman

    Oscar Goldman
    Expand Collapse
    New Member

    Joined:
    Jul 24, 2017
    Messages:
    22
    Likes Received:
    8
    HomerBB likes this.
  3. Tib2K

    Tib2K
    Expand Collapse
    New Member

    Joined:
    Jun 24, 2017
    Messages:
    45
    Likes Received:
    19
    Well the AP is up!

    Tip is exactly 25' off the ground. Pole grounded, no isolation, no choke. 100 foot of coax. installed as avanti instillation instructions recommend.

    MFJ-259B

    MHz 25.050 SWR 2.0 R=33 X=27
    MHz 26.940 SWR 1.0 R=51 X=0
    MHz 29.775 SWR 2.0 R=51 X=41
     
    Riverman71 and HomerBB like this.
  4. HomerBB

    HomerBB
    Expand Collapse
    Sr. Member

    Joined:
    Jan 4, 2009
    Messages:
    2,864
    Likes Received:
    617
    I've seen this lower than ch1 resonant frequency with the AP before.
     
    Tib2K likes this.
  5. Tib2K

    Tib2K
    Expand Collapse
    New Member

    Joined:
    Jun 24, 2017
    Messages:
    45
    Likes Received:
    19
    its up.jpg

    I don't have any complaint with a antenna that is 2.1 or better for all of the 10, 11 and 12 meter band.

    Seems like a good match for my new President Lincoln II+ V3 :D
     
    #620 Tib2K, Aug 15, 2017
    Last edited: Aug 15, 2017
    Riverman71, HomerBB and bob85 like this.
  6. Oscar Goldman

    Oscar Goldman
    Expand Collapse
    New Member

    Joined:
    Jul 24, 2017
    Messages:
    22
    Likes Received:
    8
    Looks great
    Does it stay at 1.0 swr all the way to 27 600

    I would like to know your down tube measurement, from the bottom of the mounting bracket to the bottom of the hoop. What is the diameter of your lower hoop.
    Thanks
     
    #621 Oscar Goldman, Aug 15, 2017
    Last edited: Aug 15, 2017
  7. Tib2K

    Tib2K
    Expand Collapse
    New Member

    Joined:
    Jun 24, 2017
    Messages:
    45
    Likes Received:
    19
    MHz 27.600 SWR 1.3 R=67 X=1
     
  8. Oscar Goldman

    Oscar Goldman
    Expand Collapse
    New Member

    Joined:
    Jul 24, 2017
    Messages:
    22
    Likes Received:
    8
    That is not bad at all.
    You can trim your capacitance hat a 1/4 inch on each of the rods, this will shift the swr bandwidth up higher a little.
    I put a cap hat on mine and that is how I tuned it real nice.
     
  9. Tib2K

    Tib2K
    Expand Collapse
    New Member

    Joined:
    Jun 24, 2017
    Messages:
    45
    Likes Received:
    19
  10. HomerBB

    HomerBB
    Expand Collapse
    Sr. Member

    Joined:
    Jan 4, 2009
    Messages:
    2,864
    Likes Received:
    617
    Based on the circumference you provided, the diameter become 29.5", correct?
     
  11. Tib2K

    Tib2K
    Expand Collapse
    New Member

    Joined:
    Jun 24, 2017
    Messages:
    45
    Likes Received:
    19
    The 93.375 circumference measurement I gave was because the hoop is not really round. The clamps in the middle and the down tubes made it impossible for me to get a 100% accurate diameter.

    And to be honest this morning I just assembled it and put it in the air. The only measurement I made was 21' to the bottom of the main bracket. To place the top of the top cap at exactly 25' from the ground.
     
  12. Tib2K

    Tib2K
    Expand Collapse
    New Member

    Joined:
    Jun 24, 2017
    Messages:
    45
    Likes Received:
    19
    The reason it took so long to get it in the air was, I was waiting for a pre-ordered 20 foot piece of 1.5" mast... It never came. I settled 2 10.5 foot 1.3" fence toprail...
     
    #627 Tib2K, Aug 15, 2017
    Last edited: Aug 15, 2017
    HomerBB likes this.
  13. Meglotron

    Meglotron
    Expand Collapse
    Member

    Joined:
    Mar 7, 2011
    Messages:
    52
    Likes Received:
    9
    is fence rail actualy strong enough to support an antenna?
     
  14. silver devil

    silver devil
    Expand Collapse
    Active Member

    Joined:
    Dec 11, 2010
    Messages:
    132
    Likes Received:
    32
    I used to talk to an old guy several miles from me that ran an AP about 40' above the ground and it almost talked as good as his shooting star beam he had at the same height. I have one in the original box that i got cheap (antenna is used) and i cleaned it all up and installed new hardware i just havent had it up yet. I have owned them before and they always did work good.
     
    HomerBB likes this.
  15. HomerBB

    HomerBB
    Expand Collapse
    Sr. Member

    Joined:
    Jan 4, 2009
    Messages:
    2,864
    Likes Received:
    617
    It can, but only if properly fastened to a building, and guyed to keep it rigid. I've used it, but it cost me a crashed antenna once. Many swear by it, but I prefer to use electrical conduit (EMT)in its place.
     
    JAF0 and Tib2K like this.

Share This Page