All Blog Posts (144)

using MUMBLE and MORSE CODE audio tones, and varying the Mumble output volume from 15 percent to 200 percent, this video demo's VLevel keeping the volume output of Mumble to be extremely stable at a near zero DB final audio output to the sound card, no matter the level of volume at VLeveL's input...VLevel is acting as an AUTOMATIC GAIN CONTROL, and…

Brief demo of what a morse code audio QSO over IP sounds like - using the WIRE DESKTOP APP

The Wire Desktop APP software

https://wire.com/en/

https://github.com/wireapp/wire-desktop

Description

Secure, end-to-end encrypted messenger…

Hi everyone,

A few weeks ago, I found some relatively cheap Chinese K3(S) IF filters on eBay. Since I recently purchased a K3 (with the new synthesizer), I was wondering if the offered 250 Hz and 500 Hz filters are any good. I ordered two of each variant and a 200 Hz filter from Elecraft, in order to have some comparison models. I also measured the filters that were already present in my rig and concluded which filter combination and settings are best in my…

SETUP: an UltraPico Keyer, keys a 555 TIMER CHIP..from the audio output of the 555, an audio cable is attached and goes to the input of a laptop's mic jack input...the 555 time chip sidetone is very rough sounding with lots of high pitched harmonics and key clicks...INSTEAD of trying to filter the 555's raspy tone, this video demo's using TRIGGER…

SEREN - FULL MESH, P2P AUDIO, FULL DUPLEX, HIGH FIDELITY, with adjustable bit rate..mono or stereo....using the OPUS CODEC



- LIVE DEMO SETUP -

1st SEREN OPERATOR, will act as the Central SEREN NODE using a Raspberry Pi that is always "ON"...two more SEREN operators will connect to the PI's SEREN NODE and automatically be connected…

GLAZE is a very simple p2p audio app for WINDOWS, MAC and LINUX that lets you easily create a voice chat room, call it whatever you like and you can have your fellow Morse Code OPS join you on GLAZE with just the name of the room. - no subscription required....no logins...no passwords...just the name of the room, and then type in any user name you…

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 -…

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:…

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…

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…

CWMaestro - A morse code cw sending keyboard program written for the DOS operating system decades ago...still working by using the DOSBOX program which has versions for windows, linux and mac. This keyboard software also has a logging program and adjustable cw timing settings, hot key creator, custom messages...etc...

CWMaestro is a…

40 METER LIVE CW QSO with W2XB using this remote setup:

the remote site where the remote op is located, is a WINDOWS 10 computer, over the internet, connecting to the K3S Elecraft's Raspberry Pi hardware/software interface via Tight VNC viewer and JackTrip(audio). The audio from and to the K3S, is achieved in low latency using JACKTRIP(has…

- IAMBIC and STRAIGHT KEY from:https://github.com/recri/keyer

- cw keyboard is from FLdigi : http://www.w1hkj.com/

once built and compiled, the Recri Keyer software will allow both STRAIGHT KEY and IAMBIC KEYER at the same time via a USB MIDI DEVICE(s) that…

Using a Raspberry Pi hardware/software interface connected to an Elecraft K3S rig, this video live demo's how it works to use the RazPi remote config to connect to the K3S over a remote ip location from another computer in real time... and receive and transmit cw and ssb.(i was able to qso cw with W8ACM for this demo)

Basic Setup for…

An experimental setup simulation for a RASPBERRY Pi LAN PARTY using 6 Raspberry Pi cw ops - all connected to the Ethernet switch/router local area network...sending and receiving morse code MIDI DATA to each other, using QmidiNet with LINUX NATIVE REAPER providing all the morse code software to convert cw audio to midi messages for transmit, and…

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…

From: https://github.com/recri/keyer and https://github.com/recri

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…

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…

Demo of the Recri iambic software cw iambic keyer for LINUX working on a Mint 17.3 i7 quad core 64 bit LINUX laptop: https://github.com/recri/keyer

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

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…