Chuck aa0hw's Blog (232)

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…

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…

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…

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

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…

https://keyer.elf.org/

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

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…

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 !…

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…

brief demo of QRQ CW on the LF BAND @ 77.5Khz using soundcard SDR modules for both the TRANSMITTER and the RECEIVER from RECRI KEYER https://github.com/recri/keyer

FERRITE BOBBIN CORE HI-Q antenna 1.8mH, with about .002uF cap across the 2 ends of the core winding -…

follow up from the previous video where the iphone is sending cw...

https://youtu.be/9Hmk_AHes6Y

this time, the iPHONE is receiving CW over its own MUMBLE VOICE CHAT iphone APP - but instead of using wifi, the iphone is using The 5G NETWORK...

to test and see how well you can send and receive…

testing the HASAK CW KEYER for low latency performance running JACK AUDIO CONNECTION KIT at  48K sample rate at 2 periods of 144 buffer frames

the CW KEYER from the time you hit the paddle until you hear the sidetone, while listening to the HASAK USB SOUND CARD inside JACK CONNECTION BAY

          is only 8…

Here is mine:   (from this morning's QSO with  w4dbv)

the SPEC GRAPH and SCOPE are showing Brian's signals on my k3s receiver 

the FLrig APP controls the rig from my remote position in the living room...…

test to see how well an audio derived cw keying circuit, like one of these:

https://qrqcwnet.ning.com/forum/topics/what-circuit-for-computer

can "key" the HASAK CW KEYER's straight key pins...and allow a software CW KEYBOARD…

cool python script i just found for to activate a usb webcam for LIVE VIDEO & LIVE webcam mic AUDIO

Script modified from here: https://brettviren.github.io/pygst-tutorial-org/pygst-tutorial.html

uses…

TRANSMITTER SETUP:

CW KEYBOARD sends 82 hertz CW out one of the sound card's line output jacks to a class D 30 watt audio amp... the audio amp output is connected to a FERRITE BOBBIN CORE INDUCTOR COIL (@ 1.8mH) - the output of the 30W audio amp 1st goes to a POWER TOROID TRANSFORMER with multiple windings and tested to…

75Khz soundcard SDR QRQ CW TRANSMITTER is built from the RECRI KEYER CW Keyboard - https://github.com/recri/keyer (the AD5DZ CW Keyboard can send directly at 75Khz if your sound card sample rate is set to at least 192Khz)

- CW KBD terminal…

Rohde's AM Detector circuit from:

http://www.pan-tex.net/usr/r/receivers/elrpicamdetect.htm soundcard

SDR TRANSMITTER from:…

VBAN-RECEPTOR LITE mobile app

https://shop.vb-audio.com/en/ios-android/26-vban-receptor-lite.html

VBAN-EMITTER (Linux/raspberry pi) APP…

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brief test to see how well the EAC3 CODEC can reconstruct the ON /OFF cw element framework of Morse Code from a CW KEYER sending CW at "0" hz

NOTE: test starts out at QRQ speeds, then CW speed goes down to 20wpm, gradually back up again and over 100 wpm, then back down, to give an idea of how this experimental Morse…