A low cost Elecraft AX1 Alternative Antenna
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- Опубликовано: 10 фев 2025
- 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: www.thingivers...
If you would like to support the channel! Buy me a cup of coffee. www.buymeacoff...
Also can support the channel by our Etsy store.
qrpmonkey.etsy...
To figure out band configuration. Need to determine inductance needed. I used this calculator on the web.
www.66pacific....
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.
toroids.info/T5...
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
www.amazon.com...
BNC for Tri-pod mount
www.amazon.com...
Male BNC for one side of the Coil extension and for antenna
www.amazon.com...
Female BNC for Coil extension.
www.amazon.com...
Screw is a 3mm x 10mm with a nut.
www.amazon.com...
#Sota #summitsontheair #hamradio #hamradiooperator #pota
It was great to see your creativity be successful! Thank you for sharing.
Love it, think I'm going to make one of my own to try and use my new X6100 as an HT for POTA. Thanks for posting the files!
Have fun!
I really like this design. Going to make a few for my QMX high band.
Good Luck. It can get a little tricky without a tuner. But it can be done. I would recommend building with a counterpoise if attempting to not use a tuner. My 10 meter version does work without a tuner fine. I tune it in by pushing the telescope in until i get the SWR i want.
For that collapsible antenna and aiming for the middle of the 20m band, did you get something like 11.1 μH? That's what I'm getting but it doesn't seem right. Think I may have used the calc wrong.
in the caculator I used 2.5 ft for antenna length. and a diameter of .2 at 14.175mhz.This yields 13.6 uh. calculating the turns comes out to be 57. This will be extremely tight on the toroid, but will work(I do remember on my 20m version it was wound tightly. I would put a few extra on and remove as you tune the antenna. a counterpoise can improve results. Can always remove after the fact.
@@QRPMonkey Ok, so that's pretty close to mine since I picked 14.240 as the center and am using an FT50-43 torroid. Thanks for the sense check!