Test UNUN for end fed antenna setup.

VK3ZYZ

Moderator
Staff member
One of the things I have done recently was to try an end fed long wire fed via an UNUN.
So, I thought a test UNUN may prove useful. This is the pretty rough device I tossed together over the last couple of hours....

UnUn_Top.JPG

UnUn_Btm.JPG

This is on a Jaycar LO1238 core and the main use will be to run the Nano VNA into the antenna to see what the turns ratio needs to be for that frequency.
LO1238_Core1.JPG

There are 12 turns, with a 12 way rotary switch to feed aou each turn. As the input is one turn, ratios of 1:1 thru 12:1 are selectable.
LO1238_Core2.JPG
12PosSwitch.JPG
I doubt this switch will be any good for much power, but this is really a test device, not for operation.

If this actually works, I may upgrade and use one of these switches...

6Pos_SW.jpg
6Pos_SW_BTM.png
These look to have decent power handling capability.
 
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