18Khz AM-SSB(lsb) VLF RF CW over Mumble Voice Chat using soundcard SDR - dual conversion - LIVE demo

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Jan 1, 2022, 8:48:22 AM1/1/22

to iCW - internet CW

Next experiment will be to test 2 simple circuits to modulate/de-modulate the 18Khz AM-SSB CW signals over Mumble...

1. simple VLF 18Khz am CW Transmitter to connect directly with

the mumble input

2. simple VLF 18Khz am CW Receiver to connect directly with

the mumble output

NOTE:

since the top audio frequency that mumble will transmit/OPUScodec

is about 19-20Khz

anything above 20Khz gets cut off by the mumble low pass filter...

...at 48K sample rate, should be able to get up to 23.9Khz as the top freq...but mumble stops at 20Khz...

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