All Blog Posts (419)

instead of sending a solid keydown of dits & dahs... when you key down using this method, only the smallest possible pulse width of the minimalist pulses per CW ELEMENT train, at the CW RF frequency of interest, is sent... saving battery power since the PWM key down is a tiny percentage of battery current/power being used when compared to…

THE zamgate PLUGIN, in sidechain mode, does the DE-Q'n

https://www.zamaudio.com/

ZAMGATE analyzes/measures the incoming high q wavefront of the QRQ CW and regenerates a NEW QRQ CW Note with adjustable weight and rise/fall times

The tuning of the biploar tesla coil for 16Khz is quite sharp but dramatically increases the transmitter signal antenna output - the RX ferrite antenna is also tuned by a parallel cap (TRANSMITTER is a Linux laptop, RECEIVER Is a pi4) both antennas are using SOUND CARD SDR software modules from RECRI KEYER... to be able to send and receive at…

qrq cw from a CW KEYBOARD by RECRI KEYER on a RASPBERRY PI 4 to a Behringer UCA222 to a CLASS D AMP to the FERRITE RODs ANTENNA ARRAY

https://github.com/recri/keyer

the high Q of 2 dsp CW AUDIO BANDPASS filter in series helps greatly to extract the ENB-CW modulated 8Khz carrier VLF Transmitter's signal

high Q CW BANDPASS filters otherwise would cause terrible ringing for CW; however, in this case... it actually helps

for more info on ENB-CW please see the playlist…

demo of a DC & Single conversion ULF BAND CW sound card SDR Receiver - @1.3Khz

sdr MODULES from RECRI KEYER https://github.com/recri/keyer

the single conversion setup uses a SIDECHAIN GATE to allow the PEAKS of the ULF 1.3Khz CW received by…

brief test to see how well an old ancient ipad2 can handle/perform... the task of being a remote monitor screen for typing on a software CW KEYBOARD that is resident on a Raspberry Pi 4 CW KEYBOARD setup(by recri keyer) https://github.com/recri/keyer

the ipad2…

this video is a follow video - from the 2 previous videos here on this topic:

https://youtu.be/UafXPV-d8u0

https://youtu.be/kohDcDah7Xk

in this video the same setup as in the 2nd video above is used…

pi4 is operating as a CW Keyer, using a TLC555 that is keyed by external KEYERs, the CW is recreated into a NEW CW NOTE inside the pi4...at NEAR ZERO LATENCY - also.... it is operating as an Midi CW ip TRANSCEIVER for a full duplex, 2-way CW QSO over the internet

GSTREAMER is providing the code for the ip CW…

REMOTE AUDIO over ip by PYTHON/gstreamer/ pi2b TCP SERVER and pi4 TCP CLIENT to SEND transmit AFCW TO RIG and receive audio from RIG on the REMOTE

OPs pi4 station pi2b is using ALSA in the PYTHON SCRIPT AFCW KEYING SETUP - uses the RECRI KEYER cw and sdr apps…

CARLA on this raspberry pi 4 is using the ALSA AUDIO ENGINE, with a USB SOUND CARD(Behringer UCA222) 48Khz sample rate, 3 periods of 64 buffer frames - for lowest possible latency for this operation https://kx.studio/Applications:Carla

CARLA is using 1 lv2…

several advantages for using the SRT protocol for sending & receiving CW RTP MiDi over ip for Morse Code OPs to QSO online with each other:

from:…

QRQ CW test comparing the sound of symmetrical raised cosine CW NOTEs with asymmetrical exponential CW NOTEs

using a modified PYTHON SCRIPT from: https://brettviren.github.io/pygst-tutorial-org/pygst-tutorial.htm

GSTREAMER python code used in this PYTHON SCRIPT example:

# Set up the gstreamer pipeline self.player =…

uses REAPER's free vst plugin REAGATE CW AUDIO input to CW MIDI OUTPUT

https://www.reaper.fm/reaplugs/

send CW MIDI OVER TCP/ip to other OP(s) by Gstreamer script

gst-launch-1.0 -v alsamidisrc ! queue ! rtpgstpay ! rtpstreampay ! queue !…

using a modified PYTHON SCRIPT from: https://brettviren.github.io/pygst-tutorial-org/pygst-tutorial.html this video shows a send & receive CW to and from the RIG PI INTERFACE example... by RiG/Pi TCP SERVER(pi2b) & REMOTE LAPTOP…

pi2b is really too weak for this kind of work... however, pi2b is tested anyway to see how it would perform under the stress.

- a pi4b does quite well at this though, using the same setup....

once setup , CARLA is able to save not only all the APPs and their positions, but also the wires that connect…

https://www.polyphone-soundfonts.com/

to send MIDI NOTES to the SF2 player, CARLA's own SF2 player, a midi cw output is needed....

and provided by RECRI KEYER in this example…

TEST sending CW MiDi over iP using Gstreamer from 20 wpm to over 100 wpm

create a single SINE WAVE or a single CW AUDIO NOTE using Audacity save as a WAVE FILE...

import into Polyphone Soundfont Editer…

https://www.zerotier.com/

https://github.com/recri/keyer

https://github.com/ssj71/OSC2MIDI