2SC1971 & 2SC1946A RF-amplifier =============================== Coil data: L3, L7 = 5 Turns, DIA. 6 mm, Wire 1 mm CuL (spaced) on one end of the coil (to the power supply line) place a ferroxcube bead of approx. 3 mm diameter. L2, L6 = 2 Turns, Wire 0.4 mm CuL on ferroxcube bead L4, L8 = VK200 wideband choke L1, L9, L10 = on pcb L5 = 2 Turns, DIA. 7 mm, Wire 0.7 mm (spaced)