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feeding 2 40m delta loops with ...one coax !!one loop east one loop west

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by VE3ZSZ, Aug 14, 2021.

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  1. VE3ZSZ

    VE3ZSZ Ham Member QRZ Page

    i am putting up 2 40m loops and i have seen one coax in center

    can anyone help please

    sam ve3zsz
     
  2. 2E0VSS

    2E0VSS Ham Member QRZ Page

    Both are the same?
    They have the same directionality .
    If you had said “one East west and one North south and fed them with two separate coax feeds so they would be switchable your post would make sense.
    As it stands now you post makes non-sense.. If you see what I mean..
    73
    M
     
    Last edited: Aug 14, 2021
    RW4HFN likes this.
  3. VE3ZSZ

    VE3ZSZ Ham Member QRZ Page

    lol
    my post is nonsense lol

    because feeding two delta loops with one coax has been done before !!!
    im asking where to feed ?

    are you saying it does not work what about connecting two deltas from one mast ..

    center ? earth one side fire in wire other

    you made me laugh because i won a bet thanks to you

    i bet 50 dollers that someone would say its nonsense beer and steak tonight

    thank you sir
     
  4. WA7ARK

    WA7ARK Ham Member QRZ Page

    Your question is not nonsense, and you should give back the $50...

    Is this the configuration you had in mind?
    upload_2021-8-14_16-20-56.png

    Two horizontal three-sided (delta) loops, mirrored about the Y-axis, with a common feedpoint where the loops come together. Each loop is resonant on 40m (each side is ~47ft long).

    There are various ways to combine the loops depending on where you want to send your signal. The in-phase connection shown above has a feedpoint Z of 100 Ohms, but it sends max radiation straight up, so not very useful. It is worse than either loop would be by itself.

    If I connect the two loops out-of-phase, I get a feed Z of ~50 Ohms, and a figure 8 azimuth pattern with big gain along the -X and X axes, and deep nulls along the -Y and Y axes.

    upload_2021-8-14_16-38-34.png

    This is with the two loops at 35ft agl.
     
    K0UO and VE3ZSZ like this.
  5. RW4HFN

    RW4HFN Ham Member QRZ Page

  6. VE3ZSZ

    VE3ZSZ Ham Member QRZ Page

    this is so cool this info sir

    my 2 loops are slopeing
    one loop east

    one loop west

    40 feet at top of mast to 10 to 18 feet of ground bottom of loop

    but i think should work out ..

    so out of phase is what i am looking for dx is my thing

    if im right in this it means feed each delta loop

    with braid to one loop and copper to other i take it

    i have a 4.1 balun so i could use tuner and use it on other bands

    going to tune it for 7.185 both loops my main dx goal
    and use tuner for other bands

    Thank you sir you made my day

    i knew it was possible
    ..very much big 73
     
    Last edited: Aug 15, 2021
  7. VE3ZSZ

    VE3ZSZ Ham Member QRZ Page

  8. VE7BPB

    VE7BPB Ham Member QRZ Page

    It occurs to me that if you only had two supports that the delta loops could be hung in a vertical orientation.

    With a small relay box at the feed point, one could switch to an in-phase broadside pattern, or an out-of-phase bi-directional pattern. At least that is what it looks like.

    Michael, could you show us a pattern based on that concept? It seems to me to be an easy way to get some beam steering without any phasing harnesses.

    regards, Roy
     
  9. 2E0VSS

    2E0VSS Ham Member QRZ Page

    He didn't give any idea he was suspending them parallel to the ground.
    Are we supposed to read the Ops mind?
    Let's face it, had he said sky loop then it's a different story..
    Be honest, the first thing that comes to mind re the delta is in the vertical plane.
    I'm not David Blaine and was fully justified in saying that without more info it was. non-sensical
    I rest my case your honour..
    Over and out
    Beam me up Scotty
    Get me outa here
    Wink wink!!
    M
    73
     
    Last edited: Aug 15, 2021
  10. VE3ZSZ

    VE3ZSZ Ham Member QRZ Page

    no worries mate god bless
     

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