short test by transmitting CW at 1 watt on 10 meters - going to a websdr rcvr to listen and record the sound - look for how well using AFCW MODE on an ELECRAFT K3S performs for its spectral purity and waveform preservation of a well constructed raised cosine edged CW NOTE made by the ZamGate CW RE-Keyer - transmitted by an Elecraft K3S using a…
ContinueAdded by Chuck aa0hw on April 18, 2018 at 9:25am — No Comments
brief demo of having 2 FLdigi(s) sending the same text file at 121 wpm...one FLdigi sending at the pitch of 821 hertz, the other sending at 700 hertz
there are a few QRQ CW OPS that can copy over 100 wpm that have reported in over the past years, stating that they prefer a higher CW PITCH when copying CW above 100 wpm...this short…
ContinueAdded by Chuck aa0hw on April 13, 2018 at 7:36am — No Comments
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ADJUSTING TRIGGER MIDI MONO for extremely accurate AUDIO VOLUME input to CW MIDI DATA NOTE output conversion
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FLdigi will transmit a dit at 200 wpm(1khz [green]square wave using FLdigi's…
Added by Chuck aa0hw on April 11, 2018 at 8:30am — No Comments
the typical modern RIG, usually shapes its CW TRANSMIT waveform as a raised cosine edged cw note with a Rise and Fall time between 5 and 10 milliseconds....For this test a 7ms rise and fall time of a perfect raised cosine cw note created by FLdigi is used to represent the "modern rigs" and tested against another software CW KEYER called the ZamGate…
ContinueAdded by Chuck aa0hw on March 2, 2018 at 12:22pm — No Comments
This video is demo’N a setup to create a custom QRQ CW sine wave, raised cosine edged, ‘keyable’ oscillator
There are already 2 excellent programs for LINUX for a software QRQ CW KEYBOARD… FLdigi and TWQRQ...however, neither one of them are ‘keyable’ - this first video in a new video series on “QRQ CW OVER 100 WPM” uses Fldigi as a tool to…
ContinueAdded by Chuck aa0hw on January 4, 2018 at 1:44pm — 52 Comments
This is a QRQ CW COPY TEST - to see how close I could match the great sound of FLdigi's QRQ CW with a custom cw sine wave oscillator - built up by using AMsynth and the GLAME BANDPASS FILTER...NOTE: since you can not externally KEY FLdigi... i had to search for another way to be able to key CW manually/externally - from PADDLES, KEYBOARD or…
ContinueAdded by Chuck aa0hw on December 2, 2017 at 4:44pm — No Comments
This video demos's a RASPBERRY PI using FLdigi which is sending out a stereo signal from the pi's own analogue sound card to 2 individual audio derived cw circuits: see here: http://qrqcwnet.ning.com/forum/topics/what-circuit-for-computer
one keying circuit keys…
ContinueAdded by Chuck aa0hw on October 30, 2017 at 2:00pm — No Comments
this video demo's 3 cw ops transmitting over MUMBLE, in the same channel, on iCW at the same time and yet on the receive side, each op's individual audio stream is able to be controlled using this experimental setup using all free software.
EXPERIMENTAL TEST SETUP
3 different cw ops are sending at different speeds and different pitches -…
Added by Chuck aa0hw on February 26, 2017 at 6:33pm — No Comments
2 low bitrate codecs are compared for how well they sound transmitting CW AUDIO TONES over the internet(FLdigi)...and then how well they do when their original low bitrate cw audio is regenerated using all free software vst plugins
here is a snapshot comparing the original waveforms of the 2 low bitrate codecs:…
ContinueAdded by Chuck aa0hw on February 25, 2017 at 9:08am — No Comments
This video demonstrates an A/B comparison of transmitting morse code audio tones over the internet using a NINJAM SERVER, where the CW audio quality is usually poor, with lots of pops and clicks...however, if you use the original audio from the output of the NINJAM CLIENT, and divert it first to a software APPLICATION in order to regenerate the…
ContinueAdded by Chuck aa0hw on February 24, 2017 at 4:22pm — 5 Comments
This video demo's how to create a TEXT TO MORSE CODE MIDI FILE - to use for training in QRQ CW COPY. REAPER is the main APP for playing the morse code midi file. This method allows you to choose the CW PITCH, the VOLUME, the SPEED, THE RISE and FALL TIMES of the CW EDGES.. Some more advantages of using a MIDI FILE instead of an audio file for QRQcw…
ContinueAdded by Chuck aa0hw on February 7, 2017 at 1:20pm — No Comments
The Raspberry Pi is first setup as a code practice oscillator using LINUX NATIVE REAPER and its own plugins. Then using a circuit similar to this: http://i.imgur.com/C2qYIPm.png , a 555 timer chip is keyed by a FET optoisolator that connects to a CW KEYER's key-RIG OUTPUT jack. In this video a…
ContinueAdded by Chuck aa0hw on January 2, 2017 at 10:12am — 1 Comment
This video highlights some of the top capabilities of the Raspberry PI 2b, to send a seperate LEFT and RIGHT channel audio signal to 2 different audio derived cw keying circuits in order to KEY the Elecraft K3's CW JACK for STRAIGHT KEY and IAMBIC PADDLES and to KEY the Elecraft's PTT & CW jacks in sequence when operating cw keyboard with…
ContinueAdded by Chuck aa0hw on December 17, 2016 at 11:21am — No Comments
Morse code software regeneration of a previously recorded wave file of a QRQcw qso over iCW.(https://sites.google.com/site/icwoip/)
The VST PLUGIN doing the…
Added by Chuck aa0hw on December 14, 2016 at 9:30am — No Comments
Using LINUX MINT 17.3 and some free DSP AUDIO LV2 Linux plugins...it is possible to get better cw keying on your Elecraft K3 and more versatility by bringing in the ability to use your ST KEY and IAMBIC PADDLES ... while preserving fast QSK full break in.
This is done by using AFCW A2 CW MODE and injecting a CW AUDIO TONE into the…
ContinueAdded by Chuck aa0hw on November 22, 2016 at 11:30am — 1 Comment
This video demo's a Raspberry Pi being setup as a high performance morse code cw keyboard that keys a rig with just the analogue audio output sound card of the pi...where the pi's audio output goes to 2 individual audio derived cw keying circuits which in tandem key both the PTT first on the K3 and then the CW JACK on the…
ContinueAdded by Chuck aa0hw on November 18, 2016 at 4:53pm — No Comments
Brief demo of TWQRQ(by WA0EIR), running on a Raspberry PI2b
- qrq cw sent at 75 wpm, text is from w4bqf's famous article:
https://sites.google.com/site/tomw4bqf/copyingcwover70wpm
for more info and to request the latest beta version of TWQRQ please write…
ContinueAdded by Chuck aa0hw on November 14, 2016 at 11:55am — 1 Comment
This video demos a - low cpu use - software setup - for sending and receiving morse code over Mumble Voice Chat on iCW using only the single analogue audio output of the Raspberry Pi the bcm2835 alsa sound card(output only)
NOTE: Raspbian Debian Jessie is the OS for this RazPi2b
for the lowest CPU use and…
Added by Chuck aa0hw on November 9, 2016 at 2:00pm — No Comments
The ability of the A-law PCMA G.711 audio codec to transmit extreme qrq cw audio tones over the internet, is tested using the SIP VOIP CLIENT Ekiga. https://ekiga.im/
FLdigi sends a text at 120 wpm from TOM's famous qrq cw article:
https://sites.google.com/site/tomw4bqf/copyingcwover70wpm
to the input of Ekiga, and Ekiga is connected to an ECHO REFLECTOR so you can hear your…
Added by Chuck aa0hw on October 26, 2016 at 1:07pm — No Comments
Added by Chuck aa0hw on May 27, 2016 at 2:30pm — No Comments
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