Chuck aa0hw's Blog (222)

copying QRQ CW - testing the "Riemann" Raised Cosine Window - to form the CW NOTE rise/fall edges

every Raised Cosine Window that can be used to form the CW ELEMENT Rise/Fall time edges...sounds just a little bit different at QRQ CW speeds...this test was run at 55 wpm using the Riemann Window, and 3.3 milliseconds was also trimmed off of each element to make it just a tiny bit lighter, thinner sounding, between letters...

The AD5DZ…


Added by Chuck aa0hw on September 23, 2019 at 11:00am — 1 Comment

testing various Raised Cosine Windows for copying QRQ CW using the AD5DZ Code Practice Oscillator

brief demo of selecting various raised cosine windows for copying qrq cw using the AD5DZ CPO, being keyed by the AD5DZ CW Keyboard....NOTE: ...might not hear much difference unless using a good set of headphones...the changes are subtle between all the raised cosine windows options....…


Added by Chuck aa0hw on September 18, 2019 at 2:24pm — No Comments

A CW audio bandpass filter for QRQ CW - using a Gstreamer PIPELINE script which includes the filter

Experimental test to see how well a Gstreamer AUDIO OVER IP pipeline can (also)filter CW AUDIO headed for the LINE INPUT of a RIG for CW TRANSMIT using AFCW MODE on HF SSB(remote rig over Ethernet LAN setup using a Raspberry PI2b::RIG interface)

Here is the Gstreamer script that includes the additional script for the CW AUDIO BANDPASS…


Added by Chuck aa0hw on September 7, 2019 at 4:00pm — No Comments

YPLog QRQ CW Keyboard, a WINDOWS program - working on MAC OSX - using WINEBOTTLER - LIVE DEMO

brief demo of getting the Windows program YPLOG to work on a MAC MINI Mojave OSX using WineBottler

NOTE: a Gstreamer "audio over ip" pipeline was constructed, using the OPUS AUDIO CODEC, to send audio from the MAC/YPLog over the home WIRELESS NETWORK, to…


Added by Chuck aa0hw on August 29, 2019 at 4:08pm — No Comments

QRQ CW TRANSMIT afcw mode - clean up harmonic distortion before transmitting using the FILTA plugin

Brief demo of using the FILTA LV2 plugin to virtually eliminate all harmonic distortion from QRQ CW edge noise, before transmitting in AFCW MODE

Added by Chuck aa0hw on August 17, 2019 at 8:17am — No Comments

YPLog CW Keyboard - QRQ CW over the internet test using Gstreamer's OPUS codec with CW audio bandpass filtering

this is a follow up test to the previous video demoN the Gstreamer PIPELINE code for a CW AUDIO BANDPASS filter.

In this video...not only is the previous pipeline used with its CWa audio bandpass code so you can hear your own YPLog CW KEYBOARD sidetone in near zero…


Added by Chuck aa0hw on August 15, 2019 at 3:00pm — No Comments

YPLog CW Keyboard on Windows 10 - better CW audio output quality using CW Regeneration - LIVE DEMO

Brief demo showing the original audio output waveshape and sound spectrum output from YPLog's own audio engine...and then taking that original YPLog audio output from this CW Keyboard and Regenerating it to help improve the YPLog CW NOTE waveshape, edges, and audio spectrum.

NOTE: on video, the first text copied /pasted in yplog was supposed…


Added by Chuck aa0hw on August 8, 2019 at 10:41am — No Comments

Teensy LC board - The AD5DZ CW Keyer - K1EL K40 keys the TEENSY midi input - QRQ CW test at 150 wpm

test to see how accurate the MIDI INPUT keying would be on the TEENSY BOARD, TEENSY pins 4 & 5, being keyed by an external CW KEYER's RIG KEYING OUTPUT jack(K1EL K40 - in this example) using the AD5DZ software CW KEYER Teensy MidiKeyer code

Extreme QRQ CW speed test at 150 wpm from the K1EL K40 CW KEYER - keying together TEENSY PINS 4…


Added by Chuck aa0hw on August 2, 2019 at 3:25pm — No Comments

YPLog QRQ CW Keyboard sending CW on Windows 10 using VoiceMeeter Potatoe - iCW example

YPLog is known as one of the most versatile and adjustable QRQ CW Keyer programs of all time...and this video demo's it working well on Windows 10 - to send CW to the Mumble Voice Chat input on iCW

using the new VOICEMEETER POTATOE(VMP) windows…


Added by Chuck aa0hw on July 4, 2019 at 9:32am — No Comments

QRQ CW Sidetone input for Mumble Voice Chat using MFJ-451 CW Keyboard & a telephone pickup coil

This is a follow up to the previous video using a CW KEYER:

in this video, QRQ CW from an MFJ-451 CW KEYBOARD is utilized as the example

most of the modern PCs & Laptops on Windows 10 - do not have DIRECT audio INPUT MONITORING available...this video…


Added by Chuck aa0hw on June 30, 2019 at 10:23am — No Comments

QRQ CW audio & webRTC - issues and solutions for getting GREAT CW AUDIO QSOs over the internet

webRTC usually comes stock with several audio processing engines in place .... like AGC, NOISE FILTERING, ECHO CANCELLATION which all of them will destroy how QRQ CW sounds over webRTC's OPUS AUDIO CODEC audo processing engines...

used in this example is webRTC from JITSI MEET:…


Added by Chuck aa0hw on June 14, 2019 at 12:56pm — No Comments

What QRQ CW sounds like at 75 wpm on a Tuned Radio Frequency(TRF) Receiver

Brief demo of using this TRF RECEIVER circuit(LINKED BELOW) to monitor the RIG's CW TRANSMIT - RF NEAR field - of my RIG's antenna on 80 meters

setup to listen to your rig's CW, using the RIG's antenna's NEAR FIELD RF EM - picked up by a TRF receiver's FERRITE ROD antenna - BFO'd by a simple VFO circuit

TRF Transmitter monitor…


Added by Chuck aa0hw on June 2, 2019 at 8:57am — No Comments

Keying QRQ with the AD5DZ CW Keyboard - adjust rig & kb settings while listening to a TRF receiver

demo of using a 2nd receiver, a simple TRF receiver, to adjust your RIG and your KEYBOARD settings, to make sure you are sending cw just like you want...create your own custom CW NOTE with its own type of raised cosine edge, its own weight, rise/fall time... etc.. by listening in real time to this TRF Receiver

TRF Transmitter monitor…


Added by Chuck aa0hw on May 27, 2019 at 11:30am — No Comments

Elecraft K3S - Keying QRQ CW - A1 mode VERSES A2 mode - LIVE DEMO

Brief demo of keying QRQ CW on the ELECRAFT K3S using A1 mode and A2 mode(AFCW) at 75 wpm to show the CW bandwidth spectrum and CW waveshape differences

A1 MODE = default way to key CW on the K3S , the K3S uses the typical RAISED COSINE at 8 ms rise/fall time and cannot be changed

A2 MODE is done by using the AD5DZ software CW…


Added by Chuck aa0hw on March 27, 2019 at 9:55am — No Comments

QRQ CW wearable speaker - using a flat panel speaker and the CW AUDIO CANNON

one of the challenges when using a speaker for "copy by ear" listening to QRQ CW audio tones, is that the pure sine cw audio tones bounce off the walls, floor and ceiling of the room you are in and can cause all kinds of weird effects...this experimental combo of using a surplus, 5 buck, 4 ohm, flat panel speaker and the CW AUDIO CANNON…


Added by Chuck aa0hw on March 9, 2019 at 7:02am — 1 Comment

QRQ CW Keyboard computer interface - using the Peterson Chromatic Tuner 320 & a FET optoisolator

this is a follow up video to the first two videos about using a PETERSON CHROMATIC TUNER 320 as a COMPUTER based CPO CODE PRACTICE OSCILLATOR that you can key, in with STRAIGHT KEY, IAMBIC PADDLES and a CW KEYBOARD

this video demos using an MFJ 451 CW KEYBOARD for QRQ CW sending using the same setup - a PETERSON CHROMATIC TUNER 320 and a…


Added by Chuck aa0hw on February 8, 2019 at 2:10pm — No Comments

turn an OLD 1 cpu LAPTOP into a high performance QRQ CW KEYBOARD KEYER for the ELECRAFT K3S

this video demo's using an old 1 CPU laptop as an AFCW mode, QRQ CW KEYBOARD KEYER for an ELECRAFT K3S by using the K3S USB SOUND CARD and AFCW MODE, for keying QRQ CW with the AD5DZ software CW KEYBOARD into the K3S USB SOUND CARD's LINE INPUT...the K3S VOICE VOX CIRCUIT menu setting is "ON"

the old laptop is using the latest release of…


Added by Chuck aa0hw on January 3, 2019 at 12:57pm — No Comments

Remote Rig Operations with the Elecraft K3S - using just its USB PORT and a Raspberry PI

LIVE DEMO of remote rig operations for CW using a software CW KEYBOARD, PADDLES and a STRAIGHT KEY at the remote site, as well as VOICE from the REMOTE LOCATION....

The ELECRAFT K3S has its own USB SOUND CARD, it will be used for AUDIO OVER IP and SERIAL COMMANDS over IP

to send and receive audio between the RIG and the REMOTE…


Added by Chuck aa0hw on December 27, 2018 at 12:00pm — No Comments

QRQ CW Transmit Audio Filtering - to reduce drastically your RIG from transmitting RF CW EDGE NOISE Harmonics

Even at 8.3 ms RISE and FALL time, as was used in this test setup,  which is even more than the usual COMMERCIAL RIG's  RAISED COSINE WAVE SHAPE, the amount of CW EDGE NOISE harmonic energy that you will still transmit above and below the actual CW PITCH, when sending at QRQ CW - say at 90 wpm,  is shown here in this Spectrum Analyzer view below:…


Added by Chuck aa0hw on December 23, 2018 at 8:30am — No Comments

QRQ CW qso'N over Gstreamer - Morse Code "audio OVER ip" using the FLAC Audio Codec

brief demo of what QRQ CW morse code audio tones sound like using the FLAC AUDIO CODEC on Gstreamer Pipelines

NOTE: the QRQ CW AUDIO you are hearing, if what the FLAC encoded CW AUDIO sounds like after decoding it finally on the LAPTOP(Lubuntu 18.04)

the QRQ CW AUDIO stream starts on the LAPTOP goes to the PI over wired Ethernet,…


Added by Chuck aa0hw on December 18, 2018 at 11:00am — 1 Comment

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