QRP end fed antenna
thingiverse
The QRP balun can be built as either a 20 watt 49:1 or EFHW or a 30 watt 9:1 random wire antenna. The same parts can be used, minus the capacitor for a 9:1 random wire antenna. All windings are radial, with no crossover across the toroid because of the center support post. The 49:1 was wound using 3 primary, 21 secondary winding. Two separate case designs are included in the STL files, one has an integrated wire winder. QRP 20 watt 49:1 or 30 watt 9:1 parts list: 1 type 43 toroid 22.1mmx13.7mmx6.35mm (Mouser part # 5943001801) 2 #8-32 stainless screws 2 #8-32 stainless nylon lock washers 2 #8 stainless split ring lock washers 2 #8-32 stainless nuts 2 ring or spade terminals for internal connection to the lead screws 1 chasis mount BNC female connector 24 guage enamel magnet wire 1 100Pf capacitor 3kv (mouser part # 810-CK45-B3FD101KYNA) (only needed for 49:1 balun) 4 #4-1/2 stainless sheet metal scrws for attaching the lid
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