20m HWEF 1.3 SWR but 10m SWR infinite?

Discussion in 'General Technical Questions and Answers' started by KE8OKM, Oct 14, 2021.

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  1. KE8OKM

    KE8OKM Ham Member QRZ Page

    Scratching my head on this? I have a EndFedz EFHW 20m tuned for CW/Digi area and it shows 1/1.3 SWR at 14.0600 since the antenna is also a full wave 10m why does SWR go off the chart to infinity on 10m?

    Erik
    KE8OKM
     
    Last edited: Oct 14, 2021
  2. N8TGQ

    N8TGQ Ham Member QRZ Page

    The end fedz single band antennas really are single band.
    I saw a post where someone cut one open to reverse-engineer it. It used a short length of coax as a capacitor in the box.
    I tried putting a different length of wire on one I had for 30 meters. Couldnt get it tune anywhere but 30 meters.
    See the disclaimer on the first page of the manual right above the picture.
     
    G5TM, AA4MY, KI5WW and 1 other person like this.

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