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SWR question (Bad swr on higher power only) 2 meter

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by KE6DJX, Nov 14, 2012.

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  1. KE6DJX

    KE6DJX Ham Member

    Hi, I have a copper J-pole on the roof of my house. My swr on 146.520Mhz FM is as follows:

    1/2 watt = between 1.0:1 and 1.1:1
    9 watts = 1.2:1
    130 watts = 2.5:1
    160 watts = 4.5:1

    Why would it be so good on low power and bad on high power?

    P.S. I am running RG8-X (mini-8) coax. (about 60')

  2. WB2WIK

    WB2WIK Premium Subscriber

    Sounds like a problem with the SWR meter. What are you using for that?
  3. KE6DJX

    KE6DJX Ham Member

  4. KE6DJX

    KE6DJX Ham Member

    My bad, I didnt re-calibrate meter when I switched to high power. I guess I need to CAL if I want to check different power levels... So at 130 Watts its 1.3:1 :)
  5. WB2WIK

    WB2WIK Premium Subscriber

    Yep. You need to CAL any time you change power at all, and usually also if you change frequencies or change antennas.
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