Chuck aa0hw's Blog (222)

iPHONE QRQ CW Receiver - over The 5G Network - listening to a QRQ CW signal on the iCW Mumble Server

follow up from the previous video where the iphone is sending cw...

this time, the iPHONE is receiving CW over its own MUMBLE VOICE CHAT iphone APP - but instead of using wifi, the iphone is using The 5G NETWORK...

to test and see how well you can send and receive…


Added by Chuck aa0hw on July 27, 2021 at 10:50am — No Comments

Near Zero Latency Performance for the HASAK CW KEYER/CW KEYBOARD

testing the HASAK CW KEYER for low latency performance running JACK AUDIO CONNECTION KIT at  48K sample rate at 2 periods of 144 buffer frames

the CW KEYER from the time you hit the paddle until you hear the sidetone, while listening to the HASAK USB SOUND CARD inside JACK CONNECTION BAY

          is only 8…


Added by Chuck aa0hw on July 21, 2021 at 9:02am — No Comments

if you use a PC for QRQ CW operations with your RIG, please show us the desktop APPs you are using...

Here is mine:   (from this morning's QSO with  w4dbv)

the SPEC GRAPH and SCOPE are showing Brian's signals on my k3s receiver 

the FLrig APP controls the rig from my remote position in the living room...…


Added by Chuck aa0hw on July 21, 2021 at 8:16am — No Comments

Hasak CW Keyer: using a QRQ CW Keyboard APP with an audio derived keying circuit that keys the Hasak

test to see how well an audio derived cw keying circuit, like one of these:

can "key" the HASAK CW KEYER's straight key pins...and allow a software CW KEYBOARD…


Added by Chuck aa0hw on July 20, 2021 at 8:43pm — No Comments

Python script to see & hear(or Record) a USB WEBCAM VIDEO & MIC of your CW Keyer's paddles & straight key in action

cool python script i just found for to activate a usb webcam for LIVE VIDEO & LIVE webcam mic AUDIO

Script modified from here:



Added by Chuck aa0hw on July 19, 2021 at 10:51am — No Comments

Submarine 82hz ELF soundcard SDR, QRQ CW, QRP, Transmitter & Receiver - test run at 82 wpm


CW KEYBOARD sends 82 hertz CW out one of the sound card's line output jacks to a class D 30 watt audio amp... the audio amp output is connected to a FERRITE BOBBIN CORE INDUCTOR COIL (@ 1.8mH) - the output of the 30W audio amp 1st goes to a POWER TOROID TRANSFORMER with multiple windings and tested to…


Added by Chuck aa0hw on July 2, 2021 at 11:02am — No Comments

homebrew QRQ CW 7 Transistor TRF Receiver receiving an AM CW Signal on the LF band at 75Khz @75 wpm

75Khz soundcard SDR QRQ CW TRANSMITTER is built from the RECRI KEYER CW Keyboard - (the AD5DZ CW Keyboard can send directly at 75Khz if your sound card sample rate is set to at least 192Khz)

- CW KBD terminal…


Added by Chuck aa0hw on June 7, 2021 at 1:20pm — No Comments

SEND CW to SMART PHONE with wireless router using Raspberry PI, FLdigi, Vban-Emitter & Vban-Receptor


VBAN-EMITTER (Linux/raspberry pi) APP…


Added by Chuck aa0hw on April 24, 2021 at 12:44pm — No Comments

test sending CW over IP with the EAC3 codec at Zero Hertz - demod the RX signal with a soundcard SDR


brief test to see how well the EAC3 CODEC can reconstruct the ON /OFF cw element framework of Morse Code from a CW KEYER sending CW at "0" hz

NOTE: test starts out at QRQ speeds, then CW speed goes down to 20wpm, gradually back up again and over 100 wpm, then back down, to give an idea of how this experimental Morse…


Added by Chuck aa0hw on April 13, 2021 at 12:51pm — No Comments

The Versatility of the AD5DZ CW Keyboard for QRQ CW copy by ear Practice

brief demo of having the AD5DZ CW Keyboard send a text file at 71wpm and then adjusting the KB's many settings to fine tune how the CW sounds for best COPY BY EAR during a QRQ CW training session

Added by Chuck aa0hw on April 13, 2021 at 8:00am — 1 Comment

QRQ CW Keyboard for the iPHONE using an EMF induction coil to iPHONE Microphone interface: LIVE demo

iCW example, to send CW with a QRQ CW Keyboard on the iCW Mumble Server

concept - @8Khz was found to be a peak iPHONE MIC frequency pick-up from the EMF COIL by using an audio oscillator to test which frequency is…


Added by Chuck aa0hw on April 8, 2021 at 11:11am — No Comments

VLF RF over IP IQ CW Transmitter & Receiver: LIVE demo using Gstreamer & the Recri Keyer SDR modules

Gstreamer is for all OS'es MAC, LINUX, WINDOWS 10, Raspberry Pi

Recri Keyer SDR Modules & CW Keyer, CW Keyboard…


Added by Chuck aa0hw on March 29, 2021 at 2:23pm — 1 Comment

Build your own high performance software QRQ CW AUDIO FILTER - using 4 FILTA LV2 modules in series


NOTE:  The delay from start to finish - going through 4 instances of FILTA LV2 cw audio filter modules, being connected in series, measured to be only 2.5…


Added by Chuck aa0hw on February 8, 2021 at 9:00am — No Comments

Raspberry PI remote VLF RF over IP Rcvr::RE-Transmitter - Local PC SDR VLF Receiver - QRQ CW example

experimental setup to QSO QRQ CW at 18Khz VLF RF over ip - using a PEER to PEER Gstreamer PIPELINE TCP/ip setup and a Raspberry PI as a REMOTE VLF RX/ RE-TRANSMITTER

a PI2B is setup to RECEIVE another OP's VLF RF over IP transmission(CW at 18Khz) using a Gstreamer rtp TCP/ip PIPELINE - using the WAVPACK CODEC...the PI2b…


Added by Chuck aa0hw on February 1, 2021 at 11:45am — 1 Comment

sending QRQ CW over IP over MIDI using ASEQNET TCP/IP - 80 wpm test - Linux Laptop to a Raspberry PI

test to see how stable the CW TIMING is at QRQ CW speed * 80 wpm * when using ASEQNET server/CLIENT setup midi over tcp/ip

a MIDI CW KEYBOARD is used as the CW MIDI…


Added by Chuck aa0hw on January 30, 2021 at 3:19pm — No Comments

ULF BAND Receive Ferrite Core Loopstick Antenna for SOUND CARD INPUT - LIVE DEMO with QRQ CW example

brief rundown of using a large FERRITE CORE LOOPSTICK tuned ANTENNA to hook up directly to the sound card input...and then use some SDR software modules to get rid of HUM, NOISE, HISS and other EMF QRM from the house wiring emf'N into the RX antenna etc...

the ULF CW TRANSMITTER is a PI 4's audio output - going to a 30…


Added by Chuck aa0hw on January 25, 2021 at 12:46pm — No Comments

Tuned Ferrite Rod Loopstick ULF BAND(797hz) RX antenna to MIC JACK soundcard input: LIVE demo QRQ CW

this is a follow up from the first video here -

in this video....QRQ CW is being transmitted out on the ULF band at 797 hz and at 75 wpm to a small horizontal wire loop antenna @ about 30 watts from an audio amp/4 to 1…


Added by Chuck aa0hw on January 5, 2021 at 12:00pm — No Comments

new QRQ CW KEYBOARD - In your Browser - plus, IAMBIC PADDLES & Straight Key

go to

Added by Chuck aa0hw on November 30, 2020 at 10:08am — No Comments

Wireless CW Keyer - 40 khz LF Band TX/RX - using 2 High Q Ferrite Bobbin Core Inductor Coil Antennas

wireless transmission from the CW KEYER - keying a 555 at 40 Khz - to a wireless LF RF BAND software receiver - demod'N the 40 Khz CW Keyer LF BAND transmitter's CW

the TX and RX antenna are using a high Q , series/parallel resonated FERRITE BOBBIN CORE INDUCTOR COIL - @2mH each - series and parallel resonating capacitors…


Added by Chuck aa0hw on November 24, 2020 at 3:58pm — 1 Comment

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