All Blog Posts Tagged 'cw' (20)

SEND CW to SMART PHONE with wireless router using Raspberry PI, FLdigi, Vban-Emitter & Vban-Receptor

VBAN-RECEPTOR LITE mobile app

https://shop.vb-audio.com/en/ios-android/26-vban-receptor-lite.html

VBAN-EMITTER (Linux/raspberry pi) APP…

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Added by Chuck aa0hw on April 24, 2021 at 12:44pm — No Comments

test sending CW over IP with the EAC3 codec at Zero Hertz - demod the RX signal with a soundcard SDR

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brief test to see how well the EAC3 CODEC can reconstruct the ON /OFF cw element framework of Morse Code from a CW KEYER sending CW at "0" hz

NOTE: test starts out at QRQ speeds, then CW speed goes down to 20wpm, gradually back up again and over 100 wpm, then back down, to give an idea of how this experimental Morse…

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Added by Chuck aa0hw on April 13, 2021 at 12:51pm — No Comments

ULF BAND Receive Ferrite Core Loopstick Antenna for SOUND CARD INPUT - LIVE DEMO with QRQ CW example

brief rundown of using a large FERRITE CORE LOOPSTICK tuned ANTENNA to hook up directly to the sound card input...and then use some SDR software modules to get rid of HUM, NOISE, HISS and other EMF QRM from the house wiring emf'N into the RX antenna etc...

the ULF CW TRANSMITTER is a PI 4's audio output - going to a 30…

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Added by Chuck aa0hw on January 25, 2021 at 12:46pm — No Comments

Send QRQ CW using a LINUX CW KEYBOARD that appears on your WINDOWS 10 PC in Real Time at Near Zero Latency

uses a remote RASPBERRY PI 4 that hosts the LINUX CW KEYBOARD from AD5DZ - RECRI KEYER - https://github.com/recri/keyer using SSH -X on windows to bring up the PI4 CW KEYBOARD on the WINDOWS 10 DESKTOP (uses REALvnc to attach the connections from the CW KEYBOARD MIDI…

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Added by Chuck aa0hw on November 1, 2020 at 5:30pm — No Comments

The QRQ CW RE-Keyer System - a harsh square wave IN - pure sine wave OUT - with Raised Cosine edges

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…

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Added by Chuck aa0hw on October 4, 2020 at 8:00pm — 8 Comments

Morse Code Copy by Ear Practice from YouTube CW videos - use QUISK SDR, Gate & BP filter - LIVE demo

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…

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Added by Chuck aa0hw on September 2, 2020 at 12:00pm — No Comments

Receiving a QRQ CW signal on VLF using QUISK SDR and wire antenna attached to sound card input

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

Elecraft K3 dead spots in the FULL QSK RECEIVE AUDIO when operating QRQ CW mode

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…

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Added by Chuck aa0hw on January 25, 2020 at 3:56pm — No Comments

The difference a simple QRQ CW transmit Bandpass filter can make on your RIG's TRANSMIT CW output QUALITY

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…

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Added by Chuck aa0hw on January 15, 2020 at 1:00pm — 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…

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

Filtering QRQcw audio tones with free software

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…

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Added by Chuck aa0hw on January 16, 2014 at 9:30am — 3 Comments

Test results of sending qrq cw sending over GOOGLE VOICE

I tested GOOGLE VOICE today to see how it would perform for sending and receiving qrq cw audio tones.  The cw sending software was FLdigi.  With the help of a free dsp software VSTplugin filter called:
 
THE ENGINEERS…
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Added by Chuck aa0hw on August 12, 2012 at 3:30pm — 2 Comments

Qrq cw qso via an internet remote keyed rig using all free software

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…

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Added by Chuck aa0hw on January 27, 2012 at 7:00am — 1 Comment

Good presentation of the CW MACHINE by Bengali

FROM:…

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Added by Chuck aa0hw on May 29, 2011 at 5:30am — 1 Comment

Nice article about the inventor of the MERCURY PADDLE - Steven Nurkiewicz - N2DAN(sk)

Interesting article about the creator of the MERCURY PADDLE

- N2DAN(sk)  Steven Nurkiewicz,

HERE…

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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

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…

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Added by Chuck aa0hw on March 9, 2011 at 1:30pm — No Comments

CW HEADPHONE AMP

Added by Chuck aa0hw on February 13, 2011 at 9:35am — No Comments

Weight and dash to dot ratio settings for qrq cw copy: what settings are preferred by the majority vote

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…

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Added by Chuck aa0hw on January 20, 2011 at 8:30am — No Comments

MorsePal: A WEBSITE DEDICATED TO HELPING CW OPS WORLDWIDE TO MEET AND QSO

Just found this site this week and wanted to share with everyone.

Here is the link: MorsePal





Added by Chuck aa0hw on November 11, 2010 at 2:50pm — No Comments

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