Large Ferrite Rod Transmit Antenna for Pi4 VLF CW Transmitter - series & parallel tuned for MAX OUT
14.51Khz VLF CW : the Transmit Ferrite ROD is made of high permeable NiCKEL ZiNC, 15 inches long and 1 1/4 inch in diameter
@30 turns primary & @300 turns secondary
primary is series tuned by cap - for USB SOUND CARD's headphone output
secondary is parallel tuned by CAP
MAX VLF output POWER from pi4 Behringer UCA222 USB headphone jack is about 4 to 5 mW