he secret of the apexradio 303wa-2 and SA 70000 antenna is in the balun (coupling coil), I made a balun and connected it to my 1.50m antenna, it worked perfectly from 100 KHz to 30 MHz. the secret is in the balun inside the antenna.
see the balun, primary (connected to the antenna and ground) 4 groups of 8 turns, secondary 4 turns (connected to the 470nf antenna capacitor for the RX and ground), every 8 turns of the primary 1 turn of the secondary. totaling 32 primary turns and 4 secondary turns. I'm doing tests on a 1.50m antenna.
see the balun, primary (connected to the antenna and ground) 4 groups of 8 turns, secondary 4 turns (connected to the 470nf antenna capacitor for the RX and ground), every 8 turns of the primary 1 turn of the secondary. totaling 32 primary turns and 4 secondary turns. I'm doing tests on a 1.50m antenna.
