November 2022 Blog Posts (8)

QRQ CW Receive using a HIGH Q FILTER - too much ringing? elongated CW elements? - try using a DE-Qer

demo uses TRIGGER MIDI MONO as a DE-Qer

TRIGGER MIDI MONO analyzes the input volume peaks of the HIGH Q CW elements then sends out a MIDI NOTE on/off message to a software midi input CW KEYER app like RECRI KEYER - https://github.com/recri/keyer (or…

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Added by Chuck aa0hw on November 18, 2022 at 9:56am — No Comments

3CX for Morse Code OPs to qso over WEBrtc for FREE - up to 25 participants

3CX

FREE VIDEO CONFERENCING

NO TIME OR USER LIMITS

FULL DUPLEX

Easy. No downloads or accounts Simple to create, host and join a meeting. Attendees join from their browser. No app required. We never ask your attendees to create an account or give out details.…

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Added by Chuck aa0hw on November 16, 2022 at 8:27am — No Comments

CW Transmitter - save even MORE battery power using Pulse Width Modulated CW: LIVE demo of the setup

instead of sending a solid keydown of dits & dahs... when you key down using this method, only the smallest possible pulse width of the minimalist pulses per CW ELEMENT train, at the CW RF frequency of interest, is sent... saving battery power since the PWM key down is a tiny percentage of battery current/power being used when compared to…

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Added by Chuck aa0hw on November 15, 2022 at 9:37am — 2 Comments

QRQ CW ULF band "high Q" antenna Transmitter & Receiver: test a DE-Q'r APP to get rid of the ringing

THE zamgate PLUGIN, in sidechain mode, does the DE-Q'n

https://www.zamaudio.com/

ZAMGATE analyzes/measures the incoming high q wavefront of the QRQ CW and regenerates a NEW QRQ CW Note with adjustable weight and rise/fall times

Added by Chuck aa0hw on November 13, 2022 at 6:48pm — No Comments

Tuned Bipoloar Tesla Coil with FERRITE CORE for a QRQ CW 16Khz VLF Band Transmit Antenna - LIVE DEMO

The tuning of the biploar tesla coil for 16Khz is quite sharp but dramatically increases the transmitter signal antenna output - the RX ferrite antenna is also tuned by a parallel cap (TRANSMITTER is a Linux laptop, RECEIVER Is a pi4) both antennas are using SOUND CARD SDR software modules from RECRI KEYER... to be able to send and receive at…

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Added by Chuck aa0hw on November 11, 2022 at 11:30am — No Comments

16.6kHZ tuned Ferrite Rods TRANSMIT ANTENNA array for sending QRQ CW on the VLF BAND - LIVE demo

qrq cw from a CW KEYBOARD by RECRI KEYER on a RASPBERRY PI 4 to a Behringer UCA222 to a CLASS D AMP to the FERRITE RODs ANTENNA ARRAY

https://github.com/recri/keyer

Added by Chuck aa0hw on November 9, 2022 at 3:51pm — No Comments

using very HIGH Q CW audio bandpass filters to help extract QRQ CW from a VLF 8Khz ENB-CW TX signal

the high Q of 2 dsp CW AUDIO BANDPASS filter in series helps greatly to extract the ENB-CW modulated 8Khz carrier VLF Transmitter's signal

high Q CW BANDPASS filters otherwise would cause terrible ringing for CW; however, in this case... it actually helps

for more info on ENB-CW please see the playlist…

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Added by Chuck aa0hw on November 9, 2022 at 8:28am — No Comments

ULF BAND soundcard SDR CW Receiver - DC vs Single Conversion - LIVE DEMO

demo of a DC & Single conversion ULF BAND CW sound card SDR Receiver - @1.3Khz

sdr MODULES from RECRI KEYER https://github.com/recri/keyer

the single conversion setup uses a SIDECHAIN GATE to allow the PEAKS of the ULF 1.3Khz CW received by…

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Added by Chuck aa0hw on November 8, 2022 at 10:54am — No Comments

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