IMPROVE YOUR QRQ CW COPY ON YOUR COMPUTER WITH THIS FREE SOFTWARE SETUP

[Chuck aa0hw]

Improve your qrq cw copy when listening to high speed morse code on your computer with this free software method

This video will demonstrate some unique challenges and solutions, when listening to high speed qrq cw morse code audio on your computer. Free software is used to help filter out the loud high bandwidth edge noise, from the rapid, percussive effect, of high speed cw.

The links mentioned in the video are below:
1. Download PEDALBOARD2 VST HOST
http://www.niallmoody.com/apps/pedalboard2
2. Download the ENGINEERS FILTER VST PLUGIN
http://www.rs-met.com/freebies.html
3. Download the VB-AUDIO VIRTUAL CABLE
http://vb-audio.pagesperso-orange.fr/Cable/index.htm
4. FLdigi
http://www.w1hkj.com/download.html
5. article about using FABAIN's QRQ PROGRAM
http://qrqcwnet.ning.com/forum/topics/dj1yfk-fabian-s-famous-high-s...
6. article about using MIXXX for advanced qrq cw training
http://qrqcwnet.ning.com/forum/topics/qrq-cw-training-with-mixxx

NOTE: - set your default playback sound card, in your WINDOWS SOUND PROPERTIES, Playback TAB, to the name of your own 'VIRTUAL AUDIO DEVICE'. In this example, that would be the VB-AUDIO VIRTUAL CABLE, Also, set the playback audio device for any cw audio player app you are using to listen to qrq morse code, to use the same Virtual AUDIO DEVICE name that would be listed in your players drop down menu selection for which sound card to use when playing an audio file.
SEE THESE PICTURES for examples:
1. http://i.imgur.com/D4ZELat.jpg
2. http://i.imgur.com/I80csdX.jpg

[Chuck aa0hw]

Another unique qrm at qrq speeds above 70 wpm is BASS NOTE DRONING

BASS NOTE DRONING of qrq cw above 70 wpm.

Above 70 wpm, in spite of passing the qrq cw audio through a good cw
bandpass filter, a significant amount of bass note droning was heard while listening with headphones.  The impact of each cw element has enough energy by itself, even after going through a narrow cw bandpass audio filter, to energize a bass note droning from the collective strumming effect of the cw elements themselves.  Here are the bass note frequencies vs speed,  that I heard, and measured,  while using my headphones:
70wpm      ~       31 hertz
80wpm      ~       35 hertz
90wpm      ~       39 hertz
100wpm      ~      43 hertz
110wpm      ~      47 hertz
120wpm      ~      51 hertz
130wpm      ~      55 hertz
140wpm      ~      59 hertz
150wpm      ~      63 hertz

these frequencies were measured while using  typical stereo circumaural headphones.

- Maybe someone can run this same test while using audio bandwidth restricted headphones and report their findings -