All Blog Posts Tagged 'cw' (14)

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 while…

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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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