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QRP PlugNPlay Blun 4:1

This Balun was designed for all small QRP Automatic ATU like the Elecraft K2/K1 and T1 Tuner to make them work with twin lead feeders.

The BalUns are of the low loss Guanella Type, wound on two Amidon FT82 torroids. The design is based on publications of Maxwell, Sevick and W1CQ (published in the famous QRP Magazin QRP Homebrewer  einen

Click the pictures to enlarge them!

4:1 BalUn , 50 OHM primary, 200 Ohm secondary. Plot of VSWR better 1.1 between 1,0 and 30 MHz
The Balun in its enclosure.
The Balun at an Elecraft K2.

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