This is a small antenna that can be made for any band similar to the AX1. Works well with Elecraft KX2 or radios with built in tuners.

Thingiverse: https://www.thingiverse.com/thing:626...

If you would like to support the channel! Buy me a cup of coffee. https://www.buymeacoffee.com/QRPMonkey

Also can support the channel by our Etsy store.
https://qrpmonkey.etsy.com

To figure out band configuration. Need to determine inductance needed. I used this calculator on the web.
https://www.66pacific.com/calculators...

Once the Microhenry is know. I used kit and parts calculator to determine turns on the toroid.
I used a t50-2 but you could experiment with others.

http://toroids.info/T50-2.php

Once I had that I added a few extra turns and used an antenna analyzer to bring the SWR down and and get as close to a 1:1 match as I could. Then the tuner would take care of the rest.

These are the parts used in the build.

Telescoping Antenna
https://www.amazon.com/gp/product/B07...

BNC for Tri-pod mount
https://www.amazon.com/gp/product/B08...

Male BNC for one side of the Coil extension and for antenna
https://www.amazon.com/gp/product/B07...

Female BNC for Coil extension.
https://www.amazon.com/dp/B077VNHM8S/...

Screw is a 3mm x 10mm with a nut.

https://www.amazon.com/gp/product/B07...



#Sota #summitsontheair #hamradio #hamradiooperator #pota