Chuck aa0hw's Blog (368)

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

this is a REMOTE RIG OPERATIONs setup for CW via AFCW mode for keying the RIG over IP on the LAN using Gstreamer AUDIO over IP scripts... laptop to a raspberry pi2b interface...

the RIT SETUP uses 3 SDR MODULES from RECRI KEYER in this order:

RX over IP STREAM to

"HILBERT CELL"…

https://www.haivision.com/blog/all/srt-everything-you-need-to-know-about-the-secure-reliable-transport-protocol/

using a modified PYTHON SCRIPT from:

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

a VLF 12Khz AM Transmitter & Receiver is constructed creating a 4 CHANNEL VLF RF Over IP TX & RX…

ZAMGATE SIDECHAIN GATE mode does the ENCODING and DECODING

encoder uses the RECRI OSCILLATOR SDR MODULE at ZERO HERTZ as the CW DATA KEYING INSTRUCTIONS ENCODER https://github.com/recri/keyer

CW RE-KEYER:

ZAMGATE…

http://jack-rack.sourceforge.net/

USES GSTREAMER script for both the SENDER and RECEIVER SEND 4Khz, 12Khz OR 20Khz to RX OP

here is the example using 4Khz

gst-launch-1.0 -v audiotestsrc freq=4000 ! audioconvert ! opusenc ! rtpopuspay ! udpsink host=(ip address of the RX OP) port=9999

RECEIVE OP script: gst-launch-1.0…

test to see how well a Pi4 MUMBLE iCW setup can handle all the apps it takes to setup up a MUMBLE INPUT and OUTPUT cw audio morse code RE-GENERATOR SYSTEM

80wpm QRQ CW test

https://sites.google.com/site/icwoip/

CARLA PLUGIN…

GLAME BANDPASS FILTER   http://plugin.org.uk/ladspa-swh/docs/ladspa-swh.html

iCW/mumble   https://sites.google.com/site/icwoip/

Carla Plugin HOST …

Brief Demo for sending QRQ CW over SONOBUS using KXstudio's Carla in "multiple clients" mode on a Raspberry Pi 4 SonoBus is also monitoring its input to be able to monitor the REGEN'd ZamGate CW sidetone in real time at near zero latency

a TLC555 is being keyed by FLdigi's serial port rts pin, TLC555 sending its audio…

https://github.com/gordonjcp/lysdr

i/q encoding of CW Signals from -3kHZ to -30kHZ & +3kHZ to +30kHZ was done with 12 CW KEYBOARD from RECRI KEYER…

http://www.4sqrp.com/hipermite.php

to reduce the unwanted harmonics & QRQ CW edge noise generated by a keyed TWIN-T's CW audio output...the HI-PER-MITE active audio cw filter is tested to see how well it cleans it up

\

this setup uses the following hardware:

1. raspberry pi 4

2. TLC555 that is keyed by a CW KEYER's RIG KEYING jack...(the TLC555 is powered by the PI's own 3.3v power supply via its GPiO pins

3. usb sound card with LINE INPUT - this demo uses a Behringer UCA222 the keyed 555's audio…

test using bpsk31 over ip from one op to the other to coordinate frequencies for HF QSO NOTE: NO AUDIO is heard on this video demo....visual only FLdigi provies the ENCODING and DECODING of bpsk31 Gstreamer provides the OPUS codec encoding to convert bpsk31 from and to one OP to the other here are the scripts used in this example…

this video is a follow up to the first video here: https://youtu.be/RQh_4JW6adw

this video adds a CW KEYBOARD, and straight key to the Raspberry PI 4 iambic CW keyer shown in the first video... by using a 2nd keyed CPO at a different PITCH than the 1st keyed CPO in…

TLC555 timer chip square wave oscillator is being 'keyed' (pin 4/pos rail) by a CW KEYER & its iambic paddles AND also being keyed by FLdigi using FLdigi's serial port keying setup via a usb serial port adapter and keying the serial port's RTS PIN Both the CW KEYER and FLDIGI are keying the diode side of an H11F1 FET OPTOisolator chip and…