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.


IMG_3994

The under insulator is broken too

IMG_3990
I open the tube capacitor to see how I can fix it
Everything is clued 🙁

IMG_3992
The Capacitor has 300 pf in cold condition

IMG_3999
When I warm it a little bit up…

IMG_4000
… I goes up to 380 pf !

IMG_4004
So I checked out how with the 80m coil works. Its starting from 100uH …

IMG_4005
… up to 4 uH

IMG_4007
I try to make it like at the new HF6V. This is, for test only, a 470pF capacitor.

IMG_4039
I got a polyamid pice, what I can use as a insulator for the new tube.

IMG_4040
After some minutes

IMG_4042
It take 30 minutes to made it

IMG_4043
One piece is finish. This is the uppers one

IMG_4038
I montages  between the both new tubes

IMG_4044
Here it is

Here is the new Capacitor:
IMG_4052


IMG_4053
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…

It's only fair to share...Share on FacebookTweet about this on TwitterEmail this to someonePrint this pageShare on Google+

Leave a Reply

Your email address will not be published. Required fields are marked *

Blue Captcha Image
Refresh

*