Chuck aa0hw's Blog – October 2022 Archive (10)

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…