115 turns of medium sized (2mm including insulation) insulated hook up wire on 40 mm plastic pipe close wound. Length of coil about 250mm - cut your pipe for 270 and preferably 290 mm to allow room for wire thickness variations. ~1.50m leg
Calculators
Centers to be considered. 40m Center 7.1?
80m CENTER ARES 3.873 LSB,
FT8? 3.575 Use Tuner
