[ADXA] Get 160m inv L to 80m?

[Jussi Eloranta]

Hi Randy,

On 2/20/25 13:01, rcurt at centurytel.net wrote:
>
> I also would like to get my 160 meter inverted L to work on 80, and 
> your email has made me think about a solution.  I'm thinking that 
> adding a separate radiator with a bit of spacing, may be a solution. I 
> will try this at some point, but at the present, it is a couple 
> projects and a few degrees warmer down the road. I'm listening 
> carefully for the solution.
>
I am afraid that adding another radiator will cause some problems. The 
two radiators will likely couple but eznec would tell.

The trap solution seems interesting but it would need to be light weight 
as it is going to hang in the air. Also tuning would be more involved 
now (wire length before trap affects 80m+160m and after the trap 160m). 
But it certainly can be done. One lazy solution would be to buy, for 
example, Kelemen full length 160/80 dipole that has such traps (good 
construction and light weight traps rated up to 2 kW). Those dipoles are 
somewhat pricey though ($240 or so). One would get two traps from one of 
those. I will probably try to make the trap when it gets warmer.

> By the way, great job last night on 160. I saw you work several 
> stations while I was at the operating position from about 8:30pm to 
> just after midnight.
>
Thanks. I was running remote to my shack with my cell phone :-) Somewhat 
cumbersome to use, so I decided to buy a cheap laptop for this purpose 
(remote desktop). Can't do cw/ssb remote yet until Elecraft comes up 
with the k4/0. Staying in the shack at night would not be fun as the 
thermal insulation is not that great (last night the temp there fell 
down to 34 F). This morning I was all prepared for sunrise and then, of 
course, there was a computer glitch which I could not fix by typing from 
the phone. Did not want to start driving to the shack (= wake up the dog 
and everyone else), so I missed all the fun :-(

My transmission side is fairly good now but receiving sucks. When I set 
up the antenna, I was glad to find suitable trees to hang the wires 
from. After putting everything together, I immediately noticed some 
buzzing on 160m and at that moment I felt those "donkeys ears" growing 
in my head.... I then remembered that there is underground power cable 
that is located right under the antenna!!
I don't have too many suitable trees, so in order to move it, I would 
need to get some poles to set it up. Probably better to have separate 
receiving antenna (which I will need anyway for 160/80). Joel has made a 
great doc for this but this will have to be later...

Anyway, I am still putting up temporary stuff so that I can keep myself 
entertained. The actual antennas require more careful thinking and planning.

Jussi (AA6KJ)

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