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After doing some experimentation and discussing with @DD8SF , it seems like these two lengths work:

  • 420-436 MHz: 26.2+10.5cm legs
  • 435-450 MHz: 13.3+13.3cm legs

So a fan dipole with one OCF pair? 🤔 #AmateurRadio #HamRadio

Neil E. Hodges

2025-10-05 01:15:12


Finally back on 70cm. The dipole as-is can only cover the upper ~14 MHz of 70cm, but I'm going to see about getting some even smaller brass tubing so I can extend the legs even further. 🤔

And if that doesn't work, I have plenty of variable capacitors in my shack. 👍

#AmateurRadio #HamRadio

How much is that dipole in the window?
NanoVNA @ shortest length: 44.13-j6.785Ω @ 446 MHz (SWR of 1.278)
NanoVNA @ longest length: 39.59+j10.49Ω @ 433.8 MHz (SWR of 1.392)

#hamradio #amateurradio @DD8SF
in reply to Neil E. Hodges

Neil E. Hodges
Neil E. Hodges
•
After even further experimentation, I discovered that the lower leg can remain fixed at 10.5cm for the upper part of 70cm. Just need to change the upper leg to 15cm almost exactly. 👍
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