demo of taking the harsh square wave output of any kind of keyed CPO or CW Keyer's audio output - and RE-KEYING it exactly but transforming it to a pure sine wave CW NOTE with Raised Cosine edges (only takes 6 milliseconds from start to finish) uses ZAMGATE in SIDECHAIN MODE which has a pure sine wave TONE GENERATOR connected to Zamgate port…
ContinueAdded by Chuck aa0hw on October 4, 2020 at 8:00pm — 8 Comments
Morse Code Practice when listening to a YouTube CW video (LINUX version) on Linux, using JACK AUDIO CONNECTION KIT, with the Pulse-jack modules, using QUISK SDR to select which CW SPEED from the the multiple CW signals that are playing on the video, which one you would like listen to...etc.. hitting the YOUTUBE SHORTCUTS for REVIEW to repeat…
ContinueAdded by Chuck aa0hw on September 2, 2020 at 12:00pm — No Comments
brief demo showing QUISK SDR and a wire antenna hooked up to the PC's sound card input
- picking up a weak QRQ CW signal on VLF - 18 khz
- by using the AGC on QUISK SDR and sending the QUISK SDR receive audio through the CALF EQ 5 BAND lv2 plugin, the weak signal is brought up significantly to improve copy
Added by Chuck aa0hw on February 12, 2020 at 3:25pm — No Comments
NOTICE the DEAD ZONE in the following SCOPE view of sending a couple of 55 ms DITs... while trying to listen for how much QSK RECEIVE AUDIO is between those dits....NOTE: you will see a GAP of "NO AUDIO" from phase cancellation due to the technique that the K3 firmware uses to try and get "more" QSK audio for the QRQ OP's
the steady…
ContinueAdded by Chuck aa0hw on January 25, 2020 at 3:56pm — No Comments
the CW NOTE on the left is using a Raised cosine edge at 6ms rise/fall time with NO bandpass filtering...the harmonics are plentiful as shown on the spec an below it
the CW NOTE On the Right is using the same Raised cosine edge at 6ms - but in addition - is passing through a simple Gstreamer CLI bandpass filter...the BPF virtually eliminates all harmonics above and below the CW PITCH…
ContinueAdded by Chuck aa0hw on January 15, 2020 at 1:00pm — No Comments
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…
ContinueAdded by Chuck aa0hw on December 11, 2018 at 8:30am — No Comments
The following Video demonstrates a method to filter QRQ CW morse code audio tones with free software:
If you are interested in trying this setup please see this video RE: JACKROUTER SETUP for WINDOWS 7…
ContinueAdded by Chuck aa0hw on January 16, 2014 at 9:30am — 3 Comments
Added by Chuck aa0hw on August 12, 2012 at 3:30pm — 2 Comments
Using the following free software, I was able to use my laptop and mouse to send iambic cw and FLdigi qrq to an internet remote controlled icom 735:
1, Fldigi…
ContinueAdded by Chuck aa0hw on January 27, 2012 at 7:00am — 1 Comment
Added by Chuck aa0hw on May 29, 2011 at 5:30am — 1 Comment
Added by Chuck aa0hw on April 18, 2011 at 6:29am — 2 Comments
MODIFYING THE W3NQN PASSIVE CW AUDIO FILTER TO INTERFACE WITH YOUR COMPUTER'S SOUND CARD ARTICLE IS HERE
ED, W3NQN. has made a special price offer to sell just the w3nqn parts for this project at ($23 postpaid)
to anyone interested in building this…
ContinueAdded by Chuck aa0hw on March 9, 2011 at 1:30pm — No Comments
A recent poll was taken on the front page of QRQcw asking the question by one of our members, Rick, VE3MFN:
"I'm wondering what the consensus is on weight adjustment as one gets over 50 wpm"
4 cw audio mp3 files were made using FLdigi with each file sending cw at 75 wpm at 5.5 ms rise/fall time using Hanning Raised Cosine edges. Each file had a small change in dash/dot ratio…
ContinueAdded by Chuck aa0hw on January 20, 2011 at 8:30am — No Comments
Added by Chuck aa0hw on November 11, 2010 at 2:50pm — No Comments
Added by Chuck aa0hw on March 17, 2010 at 6:04am — 1 Comment
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