DG1JAN UniBalun 1.1 Green PCB's.
 
This is a fantastic little PCB design in Germany, offers a lightweight 1:49 UnUn.  Or you can configure the PCB to be a 1:9 or1:64 UnUn.  Or a Balun (1:1, 1:4). Giving you the option to configure this PCB as an End Fed Half Wave, End Fed Random Wire, Off Centre Fed Dipole or Dipole antenna.
 
This unit is a QRP board and is sold in kit form with.
 
UniBalun PCB in green
Enamelled copper wire
Toroid of your choice
100pF 1kv Capacitor
2 x Cable ties
Quality PCB Mount BNC connector
 
Core options.
Fair-Rite T82 (5943000501) 20w SSB, 5w Data/CW 80-10m bands.
Wurth (74270118) 10w SSB, 3w Data/CW, the best option for 40-10m bands.
 
Google DG1JAN UniBalun, you will find a GitHub page with the PCB and how to assemble it.
 
Depending on the winding of the toroid, you can use the PCB to create a 1:1 or 1:4 Balun or a 1:49 UnUn, via the solder pads.
 
1:1 Balun: solder a wire jumper between Pad 1 and 3. No capacitor.
 
1:4 Balun: solder a wire jumper between Pad 1 and 2 and another jumper between Pad 3 and 4. No capacitor.
 
1:49 Unun: solder a wire-jumper between Pad 1 and 4 on the backside of the PCB (gives better isolation). Solder the capacitor to C1
 
1:9 Unun: solder a wire-jumper between Pad 1 and 4 on the backside of the PCB (gives better isolation). Solder a Wire on the backside of the PCB between the a' Pad and the GND of the BNC-Plug.
 
If you would like us to build this kit for you select the Band A kit build option on our “Get Radio-Stuff to build and test your kit”. If you select the wrong kit build options, we will cancel your order. 
 
Note
Please check your SWR before using the antenna to ensure you have a good match with your transceiver before use.
 
The Wurth core is more efficient on the higher bands above 20m.