DiY TWiN COiL FERRiTE ROD VLF band RX Antenna - QRQ CW RX test - built from C. CRANE's TWiN COiL google patent info

[Chuck aa0hw]

using the info at GOOGLE PATENTs, this "TUNED" twin coil ferrite rod loopstick VLF Receive Antenna was put together from some spare parts in the shack, for a test run at 32Khz for receiving a QRQ CW signal at 32Khz https://patents.google.com/patent/US6529169B2/en

[Chuck aa0hw]

DiY TWiN COiL FERRiTE ROD for a QRQ CW signal on the LF band(81Khz) RX Antenna

- built by using the descriptions at C.CRANE RADIO COMPANY's TWiN COiL google patent info

using the info at GOOGLE PATENTs, this "TUNED" twin coil ferrite rod loopstick VLF Receive Antenna was put together from some spare parts in the shack, for a test run at 81Khz for receiving a QRQ CW signal at 81Khz https://patents.google.com/patent/US6529169B2/en

[Chuck aa0hw]

here is another example of FERRITE ROD antennas for both TRANSMIT and RECEIVE on the VLF BAND

brief demo of using two custom Ferrite Rod antennas for TRANSMIT & RECEIVE over Through The Earth CW Comms on the VLF band @ 6469hz The Transmit Antenna is made from ferrite material 43, FERRITE CABLE CORES, 3 layers, 3 sizes, stacked inside each other to make a 1 foot length, by 1 inch in diameter complete ferrite core ROD, its secondary windings are about 350 to 400 turns, with its primary being 15 turns... it is resonant tuned for peak output at 6.469kHZ by a CAP connected to each end of its secondary windings The Receive Antenna is modified from C.Crane's TWIN COIL FERRITE ROD ANTENNA patent info on GOOGLE PATENTS here: https://patents.google.com/patent/US6529169B2/en