All Blog Posts (415)

reVerse iMAGE CW digital Mode - reduce ur Transmit bandwidth by at least half

experimental setup to send CW by 'keying' SiLENT GAPS into a narrow band 1600 hertz audio sine wave carrier, for transmit via LINE INPUT of your RIG(LSB/USB)

TRANSMIT ENCODER - by REAGATE's ducking mode output of TX REAGATE goes into a narrow bandpass filter before going to the TRANSMIT line input…


Added by Chuck aa0hw on March 1, 2024 at 2:49pm — No Comments

CW iambic KEYER by soundcard, 2 audio transformers & FREE software

using a 21Khz sine wave oscillator signal source, and 2 individual AUDIO THRESHOLD to CW MIDI output GATEs, and the RECRI KEYER's midi input iambic CW Keyer Module, using just one laptop Stereo sound card to route audio stereo audio outputs and stereo audio inputs a way to use just one stereo audio sound card native to…


Added by Chuck aa0hw on March 1, 2024 at 11:08am — No Comments

usE a FERRiTE TOROiD stepUP Transformer with a 32Khz sinewave to interface your Straight Key T UR PC

uses REAGATE GATE app to trigger a midi note output from the straight key 32Khz signal input to a sound card line input, output of REAGATE app sends a CW MIDI NOTE to key the RECRI KEYER's CW KEYER module

NOTE: this recri…


Added by Chuck aa0hw on February 28, 2024 at 2:37pm — No Comments

use Reverse Image CW method for super low bit rate OPUS CODEC audio over ip on the mumble iCW server

virtually perfect CW NOTEs in spite of using the lowest possible OPUS AUDIO CODEC bitrate on Mumble "8Khz"

- uses the REVERSE IMAGE CW METHOD for injecting silence into an audio stream, representing each CW ELEMENT; breaking up the 150 hertz stream with silent cw element blocks by using a REAGATE…


Added by Chuck aa0hw on February 27, 2024 at 12:29pm — 2 Comments

Hi Q, tuned, resonant, FERRiTE ROD TRANSMiT VLF ANTENNA for TX'n QRQ CW by a 'key'D square wave

using high Q, tuned, resonant VLF ferrite TX & RX VLF antennas(4.078Khz) a QRQ CW square wave into the resonant, tuned, high Q, TX antenna produces minimal harmonics...and even less of those harmonics survive by the time the same type of RX ferrite rod high Q, tuned, resonant, antenna removes even more of the…


Added by Chuck aa0hw on February 27, 2024 at 9:10am — No Comments

QRQ CW TX/|\RX high Q resonant VLF FERRiTE ROD antennas - how to combat ringing & element elongation

working with 4Khz VLF ferrite rod TRANSMIT and RECEIVE antennas that are High Q & tuned to resonance(see previous 2 videos for the more info on the FERRITE ROD HIGH Q antennas being used for TX & RX on 4Khz VLF):…


Added by Chuck aa0hw on February 23, 2024 at 10:53am — 1 Comment

ReaGate VST plugin - audio to CW midi NOTE output to midi input keyed, RECRI KEYER's iAMbic CW Keyer


AUDIO TO Midi CW NOTE OUTPUT converter by REAPER/reagate VST plugin…


Added by Chuck aa0hw on December 28, 2023 at 1:34pm — No Comments

using "FriTure"(A Real Time Audio Analyzer) for Morse Code Audio SPECTRUM, SCOPE & WAVEform analysis ;     has versions for WINDOWS, MAC, and Linux

RECRI KEYER's CW KEYBOARD, FILT & MIXER modules used in this video demo:

Added by Chuck aa0hw on December 28, 2023 at 9:31am — No Comments

VOiCE, Morse Code AND miniModem VLF Text Messaging over a 1 channel AUDiO over iP Gstreamer PiPEline

CW Keyboard, soundcard SDR MODULEs MIXER & FiLT from RECRI KEYER:

Added by Chuck aa0hw on December 24, 2023 at 7:55am — No Comments

attention POTA SOTA OPs: save 90 percent battery drain on transmitter PA by using a Pulse Density Modulated CW(PDM-CW) Generator by chatGPT C CODE - Live DEMO @30wpm

save 90 percent of your final power amp's battery drain using PDM-CW

instead of sending the full cw element length to the final PA,

PDM-CW sends 1 ms pulses per every 10 ms of cw element instead...

the receiver software patches back in the missing breaks in…


Added by Chuck aa0hw on December 18, 2023 at 5:43pm — 1 Comment

Low Latency REMOTE RiG, FULL DUPLEX, QRQ CW operations: 2 WAY audio, via Raspberry Pi interface & open source software

QRQ CW example, by, AUDIO OVER iP via a GSTREAMER raspberry pi TCP AUDIO SERVER and a GSTREAMER laptop TCP AUDIO CLIENT, organized by two PYTHON scripts.

- you can download the TCP SERVER and CLIENT python scripts here:



Added by Chuck aa0hw on November 22, 2023 at 3:28pm — No Comments

DiY TWiN COiL FERRiTE ROD VLF band RX Antenna - QRQ CW RX test - built from C. CRANE'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 32Khz for receiving a QRQ CW signal at 32Khz…


Added by Chuck aa0hw on October 19, 2023 at 8:21am — 1 Comment

Pulse Density Modulated CW(PDM-CW) by CW KEYBOARD sending binaural beats via 2 sine wave oscillators

in AFCW mode, a CW KEYBOARD keys 2 sine wave oscillators at 1500 hertz & 1520 hertz, the beat frequency creates the PULSE DENSITY MODULATED CW beat frequency that will become the PDM-CW TRANSMIT SIGNAL sending to the TRANSMIT INPUT on LSB at 1500 hertz(AFCW MODE)

on RECEIVE, trigger midi mono…


Added by Chuck aa0hw on October 5, 2023 at 7:08am — No Comments

Pi4 40Khz CW Transmitter output to HEADHONE JACK: to diode/transformer frequency doubler/amp/antenna

brief demo of using a simple DIODE/TRANSFORMER frequency doubler to get 40Khz CW out of a pi4 headphone jack, by sending to the diode doubler input, 20Khz from the pi's headphone jack

Pi4 HEADPHONE PHONE to diode/transformer/frequency doubler to class D amp input, CLASS D OUTPUT to a series resonant cap to a FERRITE ROD…


Added by Chuck aa0hw on July 21, 2023 at 12:43pm — 1 Comment


FROM STEVE HARRIS SWH PLUGINS DIODE PROCESSOR 2.32 Diode Processor (diode, 1185) Mangles the signal as if it had been passed through a diode rectifier network.You should probably follow this with a DC offset remover, unless you want the offset. Mode (0 for none, 1 for half wave, 2 for full wave) The mode parameter is continuously variable…


Added by Chuck aa0hw on July 13, 2023 at 11:19am — No Comments

enGage a Gate, to get rid of QRQ CW, NARROW BAND, high "q", ringing on CW RECEIVE SIGNAL - LiVE DEMO

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…


Added by Chuck aa0hw on May 31, 2023 at 7:29am — 5 Comments

extreme DATA RATE for an EXTREME NARROW BAND QRQ CW signal - on the ELF band - 12 hertz

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…


Added by Chuck aa0hw on May 27, 2023 at 12:42pm — No Comments

VLF QRQ CW Transmitter: keying a TLC551 [sq, wave osc.] to CLASS D audio amp to high Q Ferrite Resonant Antenna

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

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

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

Added by Chuck aa0hw on May 23, 2023 at 11:34am — No Comments

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