All Blog Posts (148)

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:…

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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…

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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…

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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…

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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…

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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 FET…

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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…

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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 OP

and…

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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:…

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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,…

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

QRQ CW over the OGG VORBIS audio codec - LIVE DEMO using Gstreamer TCP "audio OVER ip" scripts

test by sending a QRQ CW test file from TOM's W4BQF famous article:

https://sites.google.com/site/tomw4bqf/copyingcwover70wpm

software CW KEYBOARD by AD5DZ:

https://youtu.be/l8wKVnA4oGc

RASPBERY PI…

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Added by Chuck aa0hw on December 12, 2018 at 10:07am — No Comments

Don't TRUST the ELECRAFT K3S transmit input monitor to accurately represent what is transmitted

here is a brief VIDEO to demo the problem with the K3S transmit input monitor when operating AFCW transmit MODE

brief demo showing the ELECRAFT K3S transmitting QRQ CW in FULL QSK with RX AUDIO between LETTERS...AND while you are listening to the K3S input TRANSMIT audio monitor - it sounds like everything is ok and working well...even while…

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Added by Chuck aa0hw on December 11, 2018 at 8:30am — No Comments

QSO QRQ CW with a friend(s) using Gstreamer - send along a PICTURE of yourself with your QRQcw audio

     in HONOR of the late GREAT SK -   WILD BILL -   KB9XE   

demo of this - honoring the late great QRQcw OP

"WILD BILL", KB9XE

here are the Gstreamer scripts used for this example:

SEND a jpeg picture to…

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Added by Chuck aa0hw on November 13, 2018 at 10:00am — 5 Comments

Keying CW on the ELECRAFT K3S at 75 wpm and getting FULL QSK HF RECEIVE AUDIO between letters

Here is a video demo'N an experimental setup to key an ELECRAFT K3S at 75 wpm(FULL FAST QSK) so you are able to hear background HF RECEIVE audio between letters 

a test run using a setup using all LINUX FREE SOFTWARE to run REMOTE RIG OPERATIONS for QRQ CW at 75 wpm...trying to achieve good FULL QSK with RECEIVE HF AUDIO between letters at…

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Added by Chuck aa0hw on November 2, 2018 at 1:31pm — 1 Comment

Don't let HF STATIC get in the way of your QRQ CW copy - use the NOISE-REPELLENT plugin to reduce or eliminate HF static

brief LIVE demo on 40 meters RX - of using the Noise-repellent LV2 PLUGIN to lower(or even virtually eliminate) the HF Background audio static while listening to a CW SIGNAL

(this plugin works well on VOICE too)



https://github.com/lucianodato/noise-repellent…

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Added by Chuck aa0hw on September 18, 2018 at 8:48am — No Comments

Streaming QRQ CW practice files from FLdigi - using the OBS desktop broadcaster and the TWITCH STREAMING service

This video is a short demo of a first test trying to broadcast 5 FLdigi's sending at 5 different qrq speeds...where you can choose which FLdigi//speed you want to listen to - right from your browser listening to the TWITCH QRQcw CHANNEL.

a test to transmit and receive 5 individual channels of audio to AND from the TWITCH Streaming server -…

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Added by Chuck aa0hw on August 15, 2018 at 4:20pm — No Comments

ATTENTION: all QRQcw OPs looking for an online qrq cw qso - we have a new iCW server devoted to QRQ CW operations

iCW now has a new PRO MUMBLE SERVER dedicated for QSO'n QRQcw over the internet

It is located in Denver, Colorado

Please see this iCW website for more information: …

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Added by Chuck aa0hw on August 10, 2018 at 4:30pm — 1 Comment

QRQ CW audio tones over Gstreamer's AUDIO PIPELINES - 16 bit audio VS 24 bit audio - does 24 bit audio make any difference for QRQcw COPY by ear ?

brief test creating 2 Gstreamer AUDIO PIPELINE LOOPBACKS from a Linux Laptop TO a RASPBERRY PI 2b - over the LAN - going through routers and switches...(both using Jack Audio Connection Kit)

one PIPELINE using rtpL16***

and the other PIPELINE using rtpL24***

to compare Gstreamer's rtpL16pay and rtpL24pay RTP AUDIO PAYLOADER…

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Added by Chuck aa0hw on May 26, 2018 at 9:30am — No Comments

Created my iCW "Station"

After bringing together EhoCW, VoiceMeeter Banana and Mumble, I built an interface for my paddles using the following:

1 - Sewell USB-Serial Adapter (I had this on hand, a similar one is available on Amazon)

1 - 3.5mm Stereo Female Terminal Block panel mount connector…

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Added by Mark Tosiello on May 22, 2018 at 10:07pm — 11 Comments

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