AUDIO RECORDINGS OF QRQ CW NETs


Comment by Chuck aa0hw on March 20, 2020 at 8:07pm

Here is a new method for QRQ CW copy practice using a FLAC FILE recording of actual RF LF BAND QRQ CW signals and be able to scan the band and pick and choose which signal to listen to using an SDR APP...this FLAC FILE has 12 QRQ CW signals on it from 61wpm to 83wpm scanning LF BAND RF FREQUENCIES from 61 Khz to 83 Khz.... you can download this FLAC FILE here(about 12 minutes in length):

http://www.mediafire.com/file/2m7pc0nrn0c9z0v/QRQcwPRACTICEusingSDR...

here is a video demo of doing just that:

brief demo of recording 12 different QRQ CW signals at different speeds on the LF BAND directly - from 61 Khz to 83 Khz - using a 192 Khz sample rate sound card and Audacity...export the Audacity recording at 192 Khz sample rate into a FLAC FILE...play the FLAC FILE using VLC and use an SDR with the FLAC FILE as its input and then scan the LF BAND on the SDR for each of the 12 QRQ CW signals and listen to any of the QRQ CW transmissions with the SDR controls

experimental method for QRQ CW copy by ear practice
there are 12 QRQ CW transmissions on the flac file
- from 61 Khz to 83 Khz...each signal can be captured and heard using an SDR program

the output of the FLAC media player would usually go to a virtual audio cable(for windows), soundflower VAC(for MAC) or using JACK for linux and you can directly wire the LF RF output from the FLAC FILE playing by VLC to the input of the SDR

if you would like to try this on your desktop..using your own SDR and media player...you need to adjust your sound card's sample rate to 192 Khz

Comment by Steve Steltzer on August 11, 2020 at 5:51am

Fun to go back and listen to these Q's again. Thanks Chuck.

Comment by Chuck aa0hw on September 1, 2020 at 12:38pm

Grab your SDR APP and pick which QRQ CW SPEED you would like to practice copying CW by ear with:

     11 individual signals to choose from,  from 25 to 75 wpm, at 5 wpm increments 

The Whole book of 1John in Morse code, 11 individual, separate signals to choose from, 25 wpm to 75 wpm at 5 wpm increasing increments... Use an SDR APP like SDRsharp https://airspy.com/download/ and a virtual audio cable like VB-AUDIO's VB CABLE https://www.vb-audio.com/Cable/ to isolate, demodulate and listen to the desired wpm signal on this Bible in Morse Code video, web browser playback PLAYBACK ON WINDOWS: on Windows 10 sound properties, select the VB CABLE as your default playback device then your browser for YouTube will use VB CABLE to play the 11 VLF Frequencies on this video... then on SDR SHARP, select for its audio input the same - VB CABLE... also on SDR SHARP, select your usual sound card for SDR SHARP's audio output

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