Repair the Butternut HF5V Antenna

I bought the HF5V for only 100€ with shipping. All band works great, only on 80m I had a problem with the SWR what goes alone high. I showed this problem in a video (at the end).

So I open the antenna and checked inside the tube capacitor. Here is the video from the inside view.


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The under insulator is broken too

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I open the tube capacitor to see how I can fix it
Everything is clued 🙁

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The Capacitor has 300 pf in cold condition

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When I warm it a little bit up…

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… I goes up to 380 pf !

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So I checked out how with the 80m coil works. Its starting from 100uH …

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… up to 4 uH

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I try to make it like at the new HF6V. This is, for test only, a 470pF capacitor.

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I got a polyamid pice, what I can use as a insulator for the new tube.

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After some minutes

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It take 30 minutes to made it

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One piece is finish. This is the uppers one

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I montages  between the both new tubes

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Here it is

Here is the new Capacitor:
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3
30pf with 20KV, a huge one with 8cm diameter 🙂

The new SWR with this repair
10m
15m 20m 40m 80m
Not the optimum, but it works.
to be continue…

2 thoughts on “Repair the Butternut HF5V Antenna

  1. Thank you, thank you. It turned out the bottom insulator in the 80 meter capacitor had cracked and fallen down in the antenna. It is now fixed. Bought this around 1978.

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