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Thread: DIY moxon antenna help...

  1. #1
    Pilot Hockeystud87's Avatar
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    DIY moxon antenna help...

    So I am building my own 433 moxon, and I was wondering if anyone could help explain exactly how I attach my coaxial cable to the feeder points...


    Here is IBCrazys blog about the moxon...
    http://www.rcgroups.com/forums/showthread.php?t=1266148

  2. #2
    KK4IRW MASHTON1138's Avatar
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    Active element to one side (short wire), shield (ground) to the other (short wire). The ground plane is the long wire with no break, nothing gets soldered to it.
    Quote Originally Posted by whakahere View Post
    I keep thinking I should give up crashing too ... I guess it is an addiction.
    Quote Originally Posted by CaliDave
    Who sliced open that tauntaun?
    Me----"This is a results may vary type of hobby, get used to it."

    Video Aerial Systems Operations Manager

  3. #3
    Pilot Hockeystud87's Avatar
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    IC so I cut the coaxial cable strip it back a little and then I split the short wire in two an have the ground going to one side an the middle coaxial to the other? Then just tack it down and make sure nothing gets moved and keep dimension? Main question is if the short cable should still be attached or not...


    Ahhh now I understand the last part... But does the non ground plane wire have a break in the middle as well? If so how big should It be?
    Last edited by Hockeystud87; 20th June 2013 at 09:31 PM.

  4. #4
    Pilot Hockeystud87's Avatar
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    Click image for larger version. 

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ID:	27930Here is what I got. Going for 433.5mhzClick image for larger version. 

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ID:	27929

  5. #5
    KK4IRW MASHTON1138's Avatar
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    Cut the top wire in half. That is what you solder the coax to. The bottom is the ground plane and gets nothing soldered.
    Quote Originally Posted by whakahere View Post
    I keep thinking I should give up crashing too ... I guess it is an addiction.
    Quote Originally Posted by CaliDave
    Who sliced open that tauntaun?
    Me----"This is a results may vary type of hobby, get used to it."

    Video Aerial Systems Operations Manager

  6. #6
    Pilot Hockeystud87's Avatar
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    Ok cool so it does get cut. Any specific length?

  7. #7
    Take off... Eh Technoweenie's Avatar
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    This is the one I have built. dimensions for 433 MHz on the site.

    http://www.moxonantennaproject.com/2E0RHM/2E0RHM.htm
    Regards,
    Bryan VE3OYN
    "Technoweenie"
    If it ain't broke, don't fix it.
    If it is broke, deny everything.

  8. #8
    Pilot Hockeystud87's Avatar
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    So what I'm gathering is the feeder point distance doesn't matter.

  9. #9
    Pilot Hockeystud87's Avatar
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    Click image for larger version. 

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ID:	28014Well here it is...

  10. #10
    Take off... Eh Technoweenie's Avatar
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    Looking good. Although not required, it doesn't hurt to put a small coil of a few wraps of the coax just past the feed point to stop parasitic radiation down the coax. Also try to not run the coax back across the reflector element. Either feed from the gap end or make a drip loop away from the reflector (non-fed) element to maintain the proper radiation pattern. Moxon's have a very wide front lobe at about 100 degrees. They are quite directive front to back.

    Enjoy!!

    Edit: P.S. Yes you are correct that the feed point gap distance is not critical. The critical distance is the gap from the fed to non-fed element.
    Last edited by Technoweenie; 22nd June 2013 at 12:33 AM.
    Regards,
    Bryan VE3OYN
    "Technoweenie"
    If it ain't broke, don't fix it.
    If it is broke, deny everything.

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