Chuck aa0hw's Blog (403)

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 Code…

brief demo of having the AD5DZ CW Keyboard send a text file at 71wpm and then adjusting the KB's many settings to fine tune how the CW sounds for best COPY BY EAR during a QRQ CW training session

https://odysee.com/@QRQcw:e/QRQcwWITHad5dzCWkeyboard:9?r=HnknoaHhbXtaiVWpkvmmaPWrfFby4Cs4

iCW example, to send CW with a QRQ CW Keyboard on the iCW Mumble Server

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

concept - @8Khz was found to be a peak iPHONE MIC frequency pick-up from the EMF COIL by using an audio oscillator to test which frequency is…

Gstreamer is for all OS'es MAC, LINUX, WINDOWS 10, Raspberry Pi

https://gstreamer.freedesktop.org/download/

Recri Keyer SDR Modules & CW Keyer, CW Keyboard…

FILTA LV2 PLUGINS - http://openavproductions.com/doc/artyfx.html

NOTE:  The delay from start to finish - going through 4 instances of FILTA LV2 cw audio filter modules, being connected in series, measured to be only 2.5…

experimental setup to QSO QRQ CW at 18Khz VLF RF over ip - using a PEER to PEER Gstreamer PIPELINE TCP/ip setup and a Raspberry PI as a REMOTE VLF RX/ RE-TRANSMITTER

a PI2B is setup to RECEIVE another OP's VLF RF over IP transmission(CW at 18Khz) using a Gstreamer rtp TCP/ip PIPELINE - using the WAVPACK CODEC...the PI2b…

test to see how stable the CW TIMING is at QRQ CW speed * 80 wpm * when using ASEQNET server/CLIENT setup midi over tcp/ip

http://ccrma.stanford.edu/planetccrma/man/man1/aseqnet.1.html

a MIDI CW KEYBOARD is used as the CW MIDI…

brief rundown of using a large FERRITE CORE LOOPSTICK tuned ANTENNA to hook up directly to the sound card input...and then use some SDR software modules to get rid of HUM, NOISE, HISS and other EMF QRM from the house wiring emf'N into the RX antenna etc...

the ULF CW TRANSMITTER is a PI 4's audio output - going to a 30…

this is a follow up from the first video here - https://youtu.be/pfWvh82Qh20

in this video....QRQ CW is being transmitted out on the ULF band at 797 hz and at 75 wpm to a small horizontal wire loop antenna @ about 30 watts from an audio amp/4 to 1…

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