High "Q" 'Tuned' Large Ferrite Rods VLF Transmit Antenna for PULSE DENSiTY MODULATiON CW MODE keying
FERRiTE ANTENNA = TEN 7 inch Ferrite rods stacked together to fill the inside of a 2 inch diam. AiRDUX AiR WOUND COiL
https://airdux.com/
coil is parallel resonated by a 1.1uF CAP/coil taps, for max signal output on the VLF band at 8Khz
NOTE: using this T/R device, this setup can be modified easily
to perform full QRQ QSK operations
https://www.qrpkits.com/eztrswitch.html
FOR PORTABLE OPERATIONs: using PDM-CW MODE, saves battery power, since for each CW ELEMENT, the RF AMP is only operating 1 tenth of the time compared to full duration CW ELEMENTs
PULSE DENSITY TICK STREAM by Gstreamer script:
gst-launch-1.0 -v audiotestsrc wave=ticks tick-interval=10000000 sine-periods-per-tick=8 freq=8075 volume=.99 ! audio/x-raw, channels=1, rate=48000 ! audioconvert ! jackkaudiosink
SOUND CARD SDR MODULES used in this demo are from RECRI KEYER:
https://github.com/recri/keyer
SOME ADDITIONAL ViDEO DEMOs of PULSE DENSITY MODULATED CW examples:
• Pulse Density Modulation battery powe...
• Pulse Density Modulated HF CW Transmi...
• Pulse Density Modulated ULF CW Transm...