May 2023 Blog Posts (9)

brief demo using a simple GATE plugin, to STOP QRQ CW Ringing on the RECEIVE SIGNAL

gate is placed after antenna input, and before final CW AUDIO bandpass filter

GATE used in this example is from CALF STUDIO GEAR…

using the ENB-CW method of  encoding/decoding

brief test to see how well using the ENB-CW method to transmit and receive 12 hertz ELF EMF - for RADIO COMMs of a 'THROUGH THE EARTH' Cave Radio Transceiver prototype

NOTE: not shown on video is the MIXER, that up-converts the 12 hertz ENB-CW carrier to a 782 hertz…

this is a follow up video from the 1st one here:

for more info on the VLF TRANSMITTER SETUP see this video's description:

https://youtu.be/FyYHmT7POKA

in this video, an MFJ451 CW KEYBOARD keys the TLC551 at QRQ speeds

with high Q antennas systems for RX/TX there is too much ringing & cw element elongation for good copy retrieval from the SDR down conversion from 5Khz to CW AUDIO... an alternative to straight mixing is to REGENERATE the CW from its unusable ringing cw elements...however, the elements volume peaks have to be equalized in volume by a DSP…

brief test to see if QRQ CW at 80 wpm could be PULSE DENSITY MODULATED effectively for transmit/receive on the ULF BAND at 1.784 Khz using very high Q resonant ferrite rod loopstick TX/RX antennas

for more info on PULSE DENSITY MODULATED CW(PDM-CW) please see this playlist:…

with high Q ringing on a QRQ CW signal, by high Q filters &/or high Q antennas, you are going to get CW ELEMENT RINGING and CW ELEMENT ELONGATION which distorts the typical wave shape of the DITs and DAHS... especially on the DITs...the elongation will decrease its volume since the element takes to long to reach peak output compared to a…

WHiTE and ViOLET Noise are combined and filtered

to only transmit from 40Khz to 48Khz

and this noise is used to create CW NOTEs that are 8Khz wide on the LF BAND

uses CW RE-KEYING methods shown on this playlist:…

SQUARE WAVE to SHAPED SINE WAVE CONVERTER using 2 plugins from LSP

1. LSP SIDECHAIN MONO

2. LSP OSCILLATOR MONO

https://lsp-plug.in/?page=manuals&section=oscillator_mono…

only 2 LSP Plugins are needed for DIRECT CONVERSION from VLF CW to AUDIO CW

https://lsp-plug.in/?page=manuals&section=oscillator_mono…