Finished UNUN for EFHW End Fed Half Wave antenna I am building

in Ham Radio2 years ago

Yesterday I finished building the UNUN (unbalanced transformer) for the EFHW End Fed Half Wave Ham Radio antenna the I am going to put up in my back yard. This antenna will allow me to get on the air in the HF Ham Radio bands that I am licensed to transmit on here in Canada.

I forgot to take a picture of the hand wound torid that I built under the awesome guidance of Dave VE3GSO who guides us noobs at the LARC (London Amateur Radio Club) kit building sessions. Yes we do follow COVID-19 guidelines.

Here is a picture of the inside of the enclosure:

Here you can see the hand wound torid connected to the input coax connector and a groung lug.

Here is a picture of the closed up box:

In this photograph you are able to see the bolt out the back of the box which connects to the antenna pole.

Now I just have to get the pole and antenna wire mounted before winter gets here.


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Nice job wiring the toroid!
Do you have a schematic of the wiring?
Looks like you've used Stainless Steel bolts as well!

Thanks, my elmer drew it up. I can get it to you if you want. Yes, they are stainless steel so they won't rust.

Got the antenna up, but need to get it tuned (cut to length). My elmer has a nano VNA we can use.