This is a special Balun 4:1, It was designed for the K2 / K1 internal ATU to make it a symmeric ATU, but it can be used for any other ATU. Power is rated to < 20W
It´s a 4:1 Guanella type wound on 2 Amidon FT82-43 torroids. The Design is based on the studies of Sevick, Maxwell and the famous article of W1CQ in the great QRP Magazin QRP Homebrewer ' The measured VSWR of the balun is < 1,1 over the range 1MHz to 30 MHz. Ready made Baluns are shipped incl. individual printout.
In the mean a 100W Version of the BalUn is available, same Datas.
Click the pictures to enlarge them
|This is the VSWR chart of our 4:1 BalUn
Test was made usina a real 200 Ohm resistor over the symmetrical port with an CIA-HF Analyzer. Our HP Network Analyzer shows the same results but we dont have a readout for the HP
Between 1,0MHz and 30MHz the VSWR is below 1,1
|This is a look into the box of the K2PlugIn Balun. Actualy this one was used to take the VSWR chart above.|
|Balun and K2
The feed will be connected by special 2mm plugs. (Shipped with the BalUn by QRPproject)
|We sell the K2PlugInBalun either as a kit or ready built.
Kit PlugInBalUn 4:1 15,00 EURO
2 Original Amidon FT82-43 Torroids
2 Special Jack 2mm
2 Special Plug 2mm
1 BNC Jack
1 BNC connector
1 Enameled Wire 0,5mm
PlugInBalUn 4:1 ready made (tested and documented) 22,50 EURO
Kit BalUn 4:1 to be used in any ATU
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