Chuck aa0hw's Blog – December 2022 Archive (7)

https://github.com/gordonjcp/lysdr demo of using LYSDR to demod 3 VLF frequencies at the same time using multiple instances of LYSDR and combing their demod'D audio outputs…

QUiSK SDR with the help of unixCW, gSTREAMER & RECRI KEYER allows a unique way to practice your CW copy by EAR

SETUP: unixCW's CW program is sending the same text file at speeds below & just above, say...a current comfortable CW copy by ear speed... pick a text file and speed that is no longer than 10 to 15…

uses FLdigi, Gstreamer and VIRTUAL AUDIO CABLEs the virtual audio cables take the CW AUDIO OUTPUT from FLdigi and send it to the OP's soundcard(for CW sidetone monitoring @ low latency) AND sends it over iP to the other CW OP(can use any audio codec via Gstreamer)

one Gstreamer SCRIPT does it all - grabs FLdigi's…

demo of setting up a pi4 to act as an RTSP virtual ham radio ionosphere SERVER that many OPs can connect to for QSO'n or just listening... this setup uses an i/q input above and below ZERO POINT by about 80 Khz worth of RF SPECTRUM - to gather together and QSO uses the gSTREAMER wavpack codec, and a gstreamer…

demo showing unixcw/CW sending 8 different CW Text files at 60 wpm to a pi4 QUISK SDR, using sonobus on the pi4 to send QUISK SDR demodulated output to the iphone sonobus// iphone using REALvnc to choose which pi4 QUISK SDR VLF SIGNAL to demod and listen to

UNIXCW CW…

brief demo using the sound card SDR modules from RECRI KEYER to downconvert 5 VLF CW signals from 16Khz to 20Khz converted/mixed down to CW audio at 700 hertz

https://github.com/recri/keyer

brief demo showing the REMOTE Pi4 VLF TRANSMITTER setup and a laptop soundcard SDR receiver using its own FERRITE LOOPSTICK ANTENNA to pick up the VLF signal from the remote PI's transmitter's loop antenna located in the other room

soundcard SDR modules are from RECRI KEYER…