Ham Radio - An end fed folded dipole experiment. Part 1, the idea and design.

Discussion in 'Amateur Radio News' started by KB7TBT, Jul 7, 2019.

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  1. KB7TBT

    KB7TBT Ham Member QRZ Page

    Ham Radio - An end fed folded dipole experiment. Part 1, the idea and design.

     
    WA4EMU, AB3ZI, KD0XL and 8 others like this.
  2. WN1MB

    WN1MB Ham Member QRZ Page

    I see either a flattened/stretched out full wave loop or a shorted 1/2 wave balanced line.
     
    K2CAJ, K4AGO, K2XT and 1 other person like this.
  3. KA4DPO

    KA4DPO Platinum Subscriber Platinum Subscriber QRZ Page

    I agree, but if the feed currents are out of phase then the field will cancel just like a parallel transmission line. If he feeds it with a Balun, and the current in both sides is in phase, then is should behave like any other end fed half wave antenna.
     
  4. WD8JQN

    WD8JQN Premium Subscriber QRZ Page

    I is for current Z is for impedance
     
    KA1JY, KB1GKN, KA1VT and 1 other person like this.
  5. W6QWN

    W6QWN Ham Member QRZ Page

    Hmm... Seems to me that the theoretical impedance of a shorted half wave is zero..
     
    KA1JY, AB7E, W4AEE and 3 others like this.
  6. W6QWN

    W6QWN Ham Member QRZ Page

    You mean short both ends and feed it with a balun ??
     
  7. KA4DPO

    KA4DPO Platinum Subscriber Platinum Subscriber QRZ Page

    I was thinking that he should leave the far end open. If the current on both wires is in phase, then it should radiate just like any other half wave antenna.
     
  8. K6HPX

    K6HPX Premium Subscriber QRZ Page

    Go look up a c-pole from years ago.....

    Ken K6HPX
     
    K6PB and KB1GKN like this.
  9. AC2NZ

    AC2NZ Ham Member QRZ Page

    Is it possible to use the correct terminology? By definition, a DIPOLE is a BALANCED, CENTER-FED antenna; it has an equal length of wire on both sides of the center insulator/feedpoint.

    Thus, an "off-center fed", while being an antenna, is NOT a dipole. In fact, it's a WINDOM antenna.

    And an end-fed is a random wire or longwire antenna, NOT a dipole.
     
    K7YB, KU4X, K3DRJ and 11 others like this.
  10. AC2NZ

    AC2NZ Ham Member QRZ Page

    Exactly - all it would achieve is to increase the *wire size* a smidgen.
     
    K4AGO, KR3DX, KA4DPO and 1 other person like this.

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