All Blog Posts (189)

Key a Raspberry Pi - sine wave code practice oscillator - with your CW KEYER - just like a RIG

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: , 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…


Added by Chuck aa0hw on January 2, 2017 at 10:12am — 1 Comment

Unique iambic morse code keyer using the Jack Audio Connection Kit - software designed by AD5DZ

From: and

a free open source LINUX iambic morse code keyer designed by AD5DZ.

CONCEPT: activate 2 different MIDI NOTE MESSAGES by an external MIDI DEVICE connected…


Added by Chuck aa0hw on December 27, 2016 at 3:10pm — 1 Comment

Mechanical Switch Debounce software setup for your morse code keys, bugs & paddles, using LINUX NATIVE REAPER

With a morse code practice oscillator and a morse code hardware mechanical straight key - TAPPING THE KEY, and sending an audio tone into the MIC JACK INPUT, this video demo's the typical mechanical switch bouncing that takes place and causes breaks/gaps in the audio tone output...and then it shows a very effective LINUX NATIVE REAPER…


Added by Chuck aa0hw on December 20, 2016 at 11:10am — 1 Comment

Ubuntu Morse Code APP - IAMBIC & STRAIGHT KEY, CW KEYER - by AD5DZ - live demo

Demo of the Recri iambic software cw iambic keyer for LINUX working on a Mint 17.3 i7 quad core 64 bit LINUX laptop:

Midi Notes ZERO and ONE are being used to key the dits and the using the letters S and Z on the laptop keyboard(usingVMPK)...however, there…


Added by Chuck aa0hw on December 17, 2016 at 11:25am — No Comments

Raspberry PI software setup to key CW on an Elecraft K3 - recorded "LIVE" - CW QSO on 40 meters

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…


Added by Chuck aa0hw on December 17, 2016 at 11:21am — No Comments

Morse Code Software Regeneration : Linear verses Exponential keying test

Morse code software regeneration of a previously recorded wave file of a QRQcw qso over iCW.(

The VST PLUGIN doing the…


Added by Chuck aa0hw on December 14, 2016 at 9:30am — No Comments

Complete Ubuntu Morse Code CW STATION setup - CW Keyboard, Paddles, and Straight Key

Using Linux software , a CW KEYER, iambic paddles, and a straight key are demo'd in this video...all morse code instruments are ready to send cw at any time in "near zero" low latency so there is no lag felt when keying any of these virtual Linux software morse code generators with your actual hardware iambic paddles, or straight key...



Added by Chuck aa0hw on December 1, 2016 at 12:30pm — No Comments

Extreme QRQ CW sending(keying) with the ELECRAFT K3 - 200 wpm with incredible accuracy and performance

Using LINUX MINT 17.3 and some free DSP AUDIO LV2 Linux 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…


Added by Chuck aa0hw on November 22, 2016 at 11:30am — 1 Comment

Make your own high performance QRQ CW KEYBOARD with the RASPBERRY PI

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…


Added by Chuck aa0hw on November 18, 2016 at 4:53pm — No Comments

QRQ CW on the Raspberry PI - demo of WA0EIR's QRQ CW KEYBOARD app - TWQRQ

Brief demo of TWQRQ(by WA0EIR), running on a Raspberry PI2b

- qrq cw sent at 75 wpm, text is from w4bqf's famous article:

for more info and to request the latest beta version of TWQRQ please write…


Added by Chuck aa0hw on November 14, 2016 at 11:55am — 1 Comment

QRQ CW on the Raspberry Pi - demo of sending & receiving Morse Code tones over Mumble on iCW

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

QRQ CW(120wpm) over PCMA G.711 CODEC using Ekiga

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.

FLdigi sends a text at 120 wpm from TOM's famous qrq cw article:

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

QRQ CW over iLBC (internet Low Bitrate Codec) using LINPHONE

Testing the ability of iLBC (internet Low Bitrate Codec) to transmit and receive morse code audio tones over the internet with low bandwidth used and good packet loss concealment. By itself, this codec does not make for pleasant copy, however, if the received tone is regenerated, the iLBC CODEC seems to provide a highly dependable internet audio stream of full duplex morse code audio notes...for a QSO between 2 or more cw ops over the internet with low latency - and good qsk -…


Added by Chuck aa0hw on October 25, 2016 at 11:42am — No Comments

Morse Code over SIP voip call: 4 different audio codecs compared for morse tone quality

Using 2 seperate Jitsi voip clients/computers, that were connected to each other over the internet, this video demonstrates the audio quality of the morse code audio tones as they are transmitted from one SIP CLIENT to the other SIP CLIENT over the Session Initiation Protocol / VOIP / internet pathways. 

Codecs tested for morse code audio quality are:

1. iLBC / 8000

2. Silk / 8000

3. G722 /…


Added by Chuck aa0hw on October 24, 2016 at 10:47am — No Comments

Elecraft K3S qsk qrq performance test from 100 wpm to 60 wpm

A qsk qrq cw performance test for the Elecraft K3S from 100 wpm to 60 wpm....K3S set to FULL QSK, qrq cw mode enabled

RESULTS: at 100 wpm several of the dits were way too short causing harsh audio…


Added by Chuck aa0hw on September 10, 2016 at 8:00am — 11 Comments

TWQRQ : A new software cw keyboard from WA0EIR

WA0EIR has released a beta version of his new software cw keyboard for LINUX called  TWQRQ.

  Here is a short demo of TWQRQ sending a qrq cw file at 75 wpm.

- demo of WA0EIR's new beta software cw keyboard for LINUX - sending a qrq cw file made…


Added by Chuck aa0hw on May 16, 2016 at 2:00pm — 1 Comment

10 Free PCB Design Software


"In this assortment...are...some[of the] best and free PCB design software..."

SEE LINK ABOVE for the full article…


Added by Chuck aa0hw on April 30, 2016 at 5:00am — No Comments

Ultra PicoKeyer : tips for connecting it to your computer sound card




Added by Chuck aa0hw on April 8, 2016 at 10:00am — 6 Comments

Free open source AUDIO REPEATER app

Nice little app; free;  lets you take audio from one sound card and send it to another sound card - with adjustable sample rate and buffer size…


Added by Chuck aa0hw on February 19, 2016 at 8:00am — No Comments

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