All Blog Posts Tagged 'QRQcw' (71)

QRQ CW "audio over ip" Morse Code Net server using ZeroTier SDN, Gstreamer & a Raspberry PI - LIVE demo with 4 OPs

Brief demo of 4 QRQ CW OPs in conference, full duplex, 2-way, OPUS CODEC, Gstreamer pipelines, using ZEROtier's SDN network ip tables...each OP connecting to the same RASPBERRY PI SERVER and receiving everyone's CW AUDIO a Raspberry PI 4 is setup as a selective forwarding unit(SFU)... so each incoming morse code audio stream goes right back…


Added by Chuck aa0hw on August 1, 2020 at 8:48am — No Comments

QRQ CW over Google DUO - LIVE demo - 60 wpm QRQcw Keyboard + paddles & Straight Key

testing GOOGLE DUO's ability to send CW over the internet, and finding the best settings to keep GOOGLE DUO from degrading the CW AUDIO TONES from its internal noise filtering, AGC and echo cancellation engines... (to stop Google Duo from doing that, a very tiny volume of low freq sine wave was applied(7.83 hz) and then the CW was also sent…


Added by Chuck aa0hw on July 5, 2020 at 7:51am — No Comments

QRQcw send/receive over ip test using the Jitsi Meet WebRTC App

end a text file from CWop1 over to CWop2, both using Jitsi Meet App for connecting online for a Morse Code audio QSO...turning off WEBCAM to save CPU usage and also using a specialized Jitsi Meet script that preserves the ORIGINAL CW AUDIO :…


Added by Chuck aa0hw on June 26, 2020 at 9:37am — No Comments

Raspberry Pi 4 - remote QRQ CW Keyboard using the AD5DZ recri keyer APPs + ZitaNJbridge

zitaNJbridge provides the near zero latency audio over ip link between the RIG/pi4 interface and the remote OP's desktop

recri keyer's CW Keyer APPs used from :…


Added by Chuck aa0hw on May 31, 2020 at 2:04pm — No Comments

Using the LOXJIE A10 60 Watt Class-D Audio Amplifier as an 88Khz LF Band QRQ CW Transmitter AMP

this is a follow video to this one in this series: PC's native MOBO sound card was set to 192Khz to enable direct 88Khz CW TRANSMIT from the AD5DZ CW KEYBOARD sending a text file

the LF RF 88Khz output of the PC's sound card goes to the input of the LOXJIE A10…


Added by Chuck aa0hw on May 22, 2020 at 1:43pm — No Comments

QRQ CW test - send CW at 96 Khz on the LF band at 96 wpm and send it to another OP over IP

brief experiment to see if by using the maximum sample rate of a sound card, 192Khz, would allow sending QRQ CW at 96 Khz(the highest frequency possible at 192Khz sample rate) at 96 wpm

Gstreamer scripts are used by the TRANSMITTER and RECEIVER

- TCP CW LF RF over IP -



gst-launch-1.0 -v…


Added by Chuck aa0hw on May 17, 2020 at 6:58am — No Comments

QRQ CW OPs - minimize CW ELEMENT spectrum splatter when transmitting QRQ CW on your RIG - with this:

1. send AFCW MODE

2. use this GSTREAMER BANDPASS FILTER between your CW KEYER's audio output and the RIG's LINE INPUT


gst-launch-1.0 jackaudiosrc ! queue ! audioconvert ! audiowsincband mode=band-pass lower-frequency=600 upper-frequency=800 length=700…


Added by Chuck aa0hw on May 16, 2020 at 7:43am — No Comments

experimental QRQ CW TRANSMIT FILTER to achieve a very narrow RF bandwidth on QRQ CW TRANSMIT - VLF BAND TEST

VLF BAND TEST on 10101 Hz

20 watt VLF AMP to compact DELTA LOOP ANTENNA

received by a Ferrite rod RX VLF antenna connected directly to this recording laptop's MIC INPUT jack, demodulated from VLF into CW AUDIO by the AD5DZ SDR APPs: LO-MIXER & FILTER modules



Added by Chuck aa0hw on May 9, 2020 at 4:40pm — No Comments

CW Copy Practice using a CW MIDI file & a variable speed MIDI player with The AD5DZ CW Keyer

brief demo using REAPER as a variable sped CW MIDI FILE PLAYER ...sending a text file that has been converted to a CW MIDI file by a CW TEXT to MIDI converter like Morse Midi or ehoCW

the VARIABLE SPEED on REAPER is excellent and the timing is very accurate at any speed you dial in

the AD5DZ CW KEYER has many CW parameter adjustments,…


Added by Chuck aa0hw on April 22, 2020 at 7:52am — No Comments

QRQ CW Copy by Ear Practice - 11 CW Signals - speeds from 61 - 81 wpm - use an SDR APP to choose & listen

There are 11 CW signals to choose from,

each one at a different speed from 61 wpm to 81 wpm.

Use your own SDR APP on your own PC to scan each signal and choose the speed you would like to use for COPY BY EAR practice.

Use a Virtual audio cable as the YouTube browser playback device and set your SDR input to use the same…


Added by Chuck aa0hw on April 6, 2020 at 11:02am — No Comments

VLF-LF QRQ CW RF over ip - using an experimental REMOTE VLF-LF BAND Transmitter-Receiver server setup

brief demo of a REMOTE VLF-LF band transmitter/receiver with 9 QRQ CW ops present and sending CW

More details about the REMOTE VLF TRANSMITTER - REMOTE VLF ANTENNA here on playlist:…


Added by Chuck aa0hw on March 18, 2020 at 2:43pm — No Comments

Narrow Band QRQ CW filter, 50 hz wide, 2 APP combo to get rid of ringing & howling - 50 wpm test

this is an experimental test setup to get rid of narrow band CW filter SEA SHELL BACKGROUND HOWLING, and QRQ CW Ringing...

by using a:



the gate silences the "in between" cw element sea shell howling, and ringing, but also causes key clicks...

the following CW BANDPASS…


Added by Chuck aa0hw on February 18, 2020 at 12:16pm — No Comments

VLF Transmitter(delta loop) - VLF Receiver(Ferrite Core Bipolar Tesla Coil) - QRQ CW demo

brief demo of testing a VLF TRANSMITTER and VLF RECEIVER for QRQ CW operations

this is a follow up video to the first two using a VLF RECEIVE - BIPOLAR TESLA COIL with a FERRITE CORE antenna...the Transmitter is a tiny DELTA LOOP(7 foot per side) fed by a 5 watt audio amp…


Added by Chuck aa0hw on February 16, 2020 at 2:19pm — No Comments

Receiving a QRQ CW signal on VLF using QUISK SDR and wire antenna attached to sound card input

brief demo showing QUISK SDR and a wire antenna hooked up to the PC's sound card input
- picking up a weak QRQ CW signal on VLF - 18 khz

- by using the AGC on QUISK SDR and sending the QUISK SDR receive audio through the CALF EQ 5 BAND lv2 plugin, the weak signal is brought up significantly to improve copy

Added by Chuck aa0hw on February 12, 2020 at 3:25pm — No Comments

QRQ CW LAB - Testing a REMOTE RIG CW KEYING setup using a Raspberry PI::Rig interface

REMOTE RIG QRQ CW KEYING - over ip - using Gstreamer scripts on a Raspberry PI 2b::RIG hardware interface, and a remote OP's Linux laptop, on the local area network, wired Ethernet, going through a Router and network switches


ROUTER = 20 yr old router, 100 mb limit...

ETHERNET CABLES = two "CAT 4" - 100…


Added by Chuck aa0hw on February 8, 2020 at 3:30pm — No Comments

Gstreamer 1 line of code to produce a 2 tiered, 2 tone, final bandpass filter for CW & PTT - AFCW - QRQ CW demo

brief demo of QRQ CW testing a Gstreamer CLI 1 liner - to get two different audio bandpass filters at the same time, staggered, and incremental, for their respective tones of 707 hz and 5555 hz



gst-launch-1.0 -v interleave…


Added by Chuck aa0hw on February 4, 2020 at 2:38pm — No Comments

QRQ CW audio OVER ip test - 24 bit VS 32 bit - uncompressed audio over Ethernet

brief test of 24 bit VS 32 bit uncompressed audio going from a laptop to a Raspberry pi 2b loopback - and then right back to the laptop over Ethernet cables going through router and switches

32 bit has virtual no variance from the original audio source

24 bit does show a wide berth of harmonics generated at the lowest db…


Added by Chuck aa0hw on January 26, 2020 at 7:39am — No Comments

QRQ CW - encoded with the AC3 audio compression CODEC using Gstreamer - surprising good results

using Gstreamer to encode & decode Live Morse Code audio from the audio output of the AD5DZ software CW KEYBOARD...and then send it out on the network as UDP PACKETS...receive, decode and playback...

- really excellent quality CW AUDIO resulted from this AC3 ENCODING/DECODING test with pretty low network bandwidth traffic requirements at…


Added by Chuck aa0hw on January 12, 2020 at 3:31pm — No Comments

QRQ CW - Remote Rig Operations using a Raspberry PI & Gstreamer - with QSK RX audio between letters

brief demo showing an experimental setup using REMOTE RIG AUDIO over IP via Gstreamer SERVER::CLIENT scripts...and Gstreamer CW bandpass filter scripts...with a RASPBERRY PI 2b as the hardware/software/soundcard interface between the REMOTE OP and the RIG(K3S)



Added by Chuck aa0hw on January 2, 2020 at 10:00am — 3 Comments

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