How to Build a UN-UN
To Build a UN-UN you need the following Items
Amidon Ferrite Toroid model T 200-2 ( 0-30 MHz )
Amidon Ferrite Toroid model T 200-6 ( up to 50 MHz )
about 3 metres of insulated copper wire 0,75mm
Direction: Fold the 3 metres of copper insulated wire in two. Mark the wires’ end so to recognize them when the windings is done.
Wind 13 to 19 turns of the bifilar wire ( more turns better response to lower band ).
Connects the wire to the box terminal and the UHF connector ( SO 239 ) see the pics. READY
|Some think that the UN-UN is just a 4:1 Balun but look at the drawings|