Chuck aa0hw's Blog (403)

resonant CW SPEAKER using a 5 port PVC PIPE framework - LIVE demo

using different configurations of PVC PIPE(2 INCH Diam) to create a device that will be resonant, increase volume & the sound stage area, and just sit on top of one small speaker, (a radio shack communications speaker)

Added by Chuck aa0hw on December 29, 2021 at 3:24pm — No Comments

30Khz CW Transmitter using a Bipolar Tesla Coil Ferrite Core Antenna that has tuned resonance @30Khz

experimental BiPolar Tesla Coil with a large massive ferrite core, that resonates at 30Khz, to act as a CW transmitter antenna...

CW is sent from a CW KEYBOARD that can send directly at 30Khz, goes out of a sound card that has a sample rate of at least 96Khz...the 30Khz CW output goes to the audio input of a cheap class D…

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Added by Chuck aa0hw on December 25, 2021 at 12:18pm — No Comments

passive QRQ CW AUDIO BANDPass filter using 3 series/parallel tuned Ferrite Rod Loopstick Antenna stages

SQUARE WAVE to SINE WAVE by a 3 stage CW AUDIO BANDPASS FILTER setup using 3 sets of tuned ferrite rods,  tuned similar in the way that an antique crystal wireless set would be tuned at the antenna stage, the passive bandpass filter middle stage, and the 3rd filter going to the 1st stage of detection...

GO FROM THIS:…

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Added by Chuck aa0hw on December 24, 2021 at 9:53am — No Comments

Raspberry PI 4: CLi Terminal Command Line software CW KEYER and CW multi-OP QSO'n over ip VOIP setup

USES TWO CLi Terminal command line APPs

1. chucK programming language for the CW Keyer, and CW Keyboard

https://chuck.cs.princeton.edu/…

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Added by Chuck aa0hw on December 22, 2021 at 2:55pm — No Comments

QRQ CW OPs - copy QRQ CW using your hearing aid telecoils & this DIY Telecoil CW AUDIO transmitter

see previous video for this telecoil transmitter for more info in the 1st video description notes https://youtu.be/L1OmVx4mxU8

uses 2 ferrite bobbin core inductor [telecoil transmitter] coils... something like one of these from:…

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Added by Chuck aa0hw on December 20, 2021 at 12:07pm — No Comments

HAMFEST HELMET VLF CW COMMUNICATOR - use Ferrite Rod loopstick Transmit Antenna on top of the Helmet

HAMFEST HELMET PORTABLE VLF RF CW COMMUNICATOR PROTOTYPE - FERRITE ROD LOOPSTick VLF RF 3.8Khz Vertical Transmit Antenna - powered by a portable 12 Volt Class D amp. (ferrite rod = 7 inch long & 1/2 inch diameter TUNED to series resonance at the VLF RF frequency of interest by the appropriate CAPACITOR)

A simple…

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Added by Chuck aa0hw on December 17, 2021 at 2:13pm — No Comments

QRQ CW Resonant Speaker using a 4 " diameter PVC ELBOW on top of a small speaker - loudest at 750hz

resonant cw speaker test by placing a 45 degree, PVC ELBOW over a small speaker

NOTE: the audio you hear on this video is coming straight from the WEBCAM's MICROPHONE

Added by Chuck aa0hw on December 16, 2021 at 3:19pm — No Comments

VBAN_EMITTER now has jack support - Morse Code QRQ CW example - CW to an iPhone using VBAN receptor

https://github.com/billythehippo/vban-1 (this open source VBAN project has Jack Audio Connection Kit support)

Added by Chuck aa0hw on December 15, 2021 at 11:51am — No Comments

Raspberry Pi 4 - remote VLF RF QRQ CW Transmitter - LIVE Demo using the Ultragrid VLF RF over IP APP

BRIEF demo of someone sending 14.4Khz QRQ CW VLF RF over IP to a Remote RASPBERRY PI 4 and the Pi-4 RE-Transmits the incoming signal over to an indoor VLF Transmit antenna... a local VLF soundcard SDR Receiver Antenna picks up the signal from the PI 4 RE-Transmitter and mixes the 14.4Khz down to 780 hz QRQ CW Morse Code audio tones…

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Added by Chuck aa0hw on December 15, 2021 at 10:48am — No Comments

How To use CW REGENERATION to get better CW AUDIO TONE quality from echoLINK during ARRL CW PRACTICE

uses a CW REGENERATION method(s)

this example uses the ZamGate 2 channel SIDEchain gate an I/Q sine wave generator is placed on the holding bay ports of ZamGate...

http://www.zamaudio.com/?p=976

the echolink CW AUDIO output from the ARRL…

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Added by Chuck aa0hw on October 27, 2021 at 8:52am — No Comments

for the PYTHON CW OPs out there - to QSO online with each other - here is a homebrew full duplex, Full Mesh Networking setup

modified python script for RECEIVING every connecting CW OP

to the FULL MESH, ZEROTIER, PRIVATE IP network is from:

https://brettviren.github.io/pygst-tutorial-org/pygst-tutorial.html

NOTE: other mods…

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Added by Chuck aa0hw on October 16, 2021 at 11:52am — No Comments

Send QRQ CW AUDIO OVER IP with WebCall Audiophile Telephony - WebCall offers free WebRTC telephony

this video is a followup video from the 1st testing of WebCall for Morse Code Audio QSO here -

https://youtu.be/1h8v865N7IE

2nd test of WebCall to see how well this FREE WebRTC service/APP will handle

QRQ CW MORSE CODE AUDIO…

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Added by Chuck aa0hw on October 16, 2021 at 10:17am — No Comments

YPLog QRQ CW Keyboard on Linux(W.I.N.E.) - special method to convert YPLog to Raised Cosine CW edges

PulseAudio is not being used, only the DEFAULT ALSA Sound Card...

the default alsa sound card is an ALSA LOOPBACK VIRTUAL SOUND CARD this Zalsa Command brings the YPLog CW AUDIO into the JACK AUDIO CONNECTION BAY for processing through the alsa loopback virtual cable:

jack_load -w -a zalsa_in -i "-d…

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Added by Chuck aa0hw on October 9, 2021 at 8:07pm — No Comments

Experimental iPhone RTSP CLIENT Morse Code Audio over IP Receiver receiving QRQ CW from RTSP SERVER

VLC has an ios version....

https://www.videolan.org/vlc/download-ios.html

an RTSP SERVER was setup on a PC and a Morse Code CW KEYBOARD was sending CW AUDIO into the input of the RTSP SERVER's audio input ports

Added by Chuck aa0hw on October 7, 2021 at 9:19am — No Comments

Linux/Ubuntu DIY adjustable QRQ CW Code Practice Sine Wave Oscillator - keyed using MIDI INPUT

BUILT from scratch using INGEN and a bunch of LV2 plugins:

see previous videos about this topic:

https://youtu.be/z6XLEQXCu9E

https://youtu.be/o5TKfq41wnE

also - for even more…

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Added by Chuck aa0hw on October 1, 2021 at 2:00pm — No Comments

QRQ CW Keyboard in a Browser & use this Keyboard to have a QRQ CW QSO over IP with another QRQ CW OP

https://keyer.elf.org/

The transmit & receive OPUS AUDIO over IP PYTHON scripts to QSO CW are modified from the original PYTHON SCRIPTS here:…

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Added by Chuck aa0hw on September 6, 2021 at 8:40pm — No Comments

DIY Build your own IAMBIC TOUCH PADDLES CW KEYER using all free software and junk box hardware parts

HARDWARE USED in this example:

***********************************

2 brass spheres

2 bolts/nuts

3 ALLIGATOR CLIP LEADS

2INCH PVC CAP

RUBBER BANDS

small rectangular COPPER PLATE

audio…

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Added by Chuck aa0hw on September 3, 2021 at 8:48am — No Comments

send CW over ip and send REAL TIME Text Messaging at the same time using Gstreamer scripts

GSTREAMER CW SEND, TEXT SEND, SCRIPT used in this example: ********************************************************************

gst-launch-1.0 -v ximagesrc startx=1200 use-damage=0 ! video/x-raw,framerate=30/1 ! queue ! videoconvert ! queue ! vaapih264enc bitrate=1000 ! queue ! h264parse ! mpegtsmux name=mux ! queue !…

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Added by Chuck aa0hw on September 1, 2021 at 8:57pm — No Comments

Stream 2 Morse Code webcams at the same time with 1 Gstreamer Script - show live paddles & st key PLUS the op sending

brief test to stream a USB WEBCAM along with the laptop's native webcam in the laptop lid at the same time over ip to another location

DEMO one webcam showing the MORSE CODE SENDING GEAR (with audio)

DEMO another webcam(laptop's own webcam) showing the person sending the morse…

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Added by Chuck aa0hw on September 1, 2021 at 2:00pm — No Comments

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