Multiband parallel dipole antenna

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by LY5AX, Apr 15, 2018.

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  1. LY5AX

    LY5AX Ham Member QRZ Page

    Hello everybody,
    I want to build multiband parallel dipole antenna and I want to use a balun for this antenna. My question is Which type of balun should I use 1:1 current balun or 4:1 current balun? What are the differences between these baluns?
     
  2. WA8UEG

    WA8UEG XML Subscriber QRZ Page

    Assuming coax feed line 1:1.

    I have never used a balun on any of my fan or parallel dipoles and never had any issues but can't hurt and will eliminate any concerns of common mode problems.

    Simple answer: 1:1 does not change the impedance. 4:1 changes the Impedance like needing to go from 300 to 75 ohms.
     
  3. NH7RO

    NH7RO Ham Member QRZ Page

    A simple 1:1 current choke at the feedpont made with a Mix 31 or 43 core (either good for HF/MF) is a good idea to prevent common mode on your feedline and it might also reduce noise pickup. Check out the details on G3TXQ's or K9YC's pages; they're the "go-to" guys when it comes to baluns and choking impedances, types and windings details, etc.

    73,

    Jeff
     

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