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ARRL EFHW Kit Mod

Oct 30th 2022, 23:04

dan_spence@me.com

Joined: May 21st 2022, 21:01
Total Topics: 0
Total Posts: 0
I’m considering replacing the 40m HW with approximately 134 foot wire to get 80 m and WARC bands.

Anyone tried this? Seems like the 49:1 UNUN would stay the same. I would like your thoughts on this.

Thanks, Dan
Oct 31st 2022, 12:19

W1VT

Super Moderator

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
https://vk3il.net/projects-antenna/multiband-end-fed-80-10m-antenna/
He provides a NEC model
Oct 31st 2022, 19:27

dan_spence@me.com

Joined: May 21st 2022, 21:01
Total Topics: 0
Total Posts: 0
Thanks. That’s interesting. I’m still hoping to replace the the wire from the ARRL kit with a longer one. No traps, just wire.
Nov 1st 2022, 07:38

W1VT

Super Moderator

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
The harmonic resonant frequencies are typically higher than desired, so a compensation coil is added to move them down.

https://www.eznec.com/This program is now free. It can be used to investigate ways of aligning the resonances to selected frequencies.
Nov 1st 2022, 08:45

dan_spence@me.com

Joined: May 21st 2022, 21:01
Total Topics: 0
Total Posts: 0
Thanks

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