Remote Rig Operations with the Elecraft K3S - using just its USB PORT and a Raspberry PI
LIVE DEMO of remote rig operations for CW using a software CW Keyboard, PADDLES and a STRAIGHT KEY at the remote site, as well as VOICE from the REMOTE LOCATION....
The ELECRAFT K3S has its own USB SOUND CARD, it will be used for AUDIO OVER IP and SERIAL COMMANDS over IP
to send and receive audio between the RIG and the REMOTE OP
and to adjust the RIG's control over the USB SERIAL CONNECTION
a Raspberry pi is used as an interface between the RIG and the REMOTE OP....the RASPBERRY PI is going to use the K3S usb sound card as 'ITS' soundcard, and transfer all audio to and from the remote op to the RIG
the RASPBERRY PI will also use the USB PORT as a serial interface so that FLrig on the PI can be used over REALvnc by the REMOTE OP to adjust the RIG's controls
HERE IS A BLOCK DIAGRAM and explanation of the TRANSMIT SCHEME- https://imgur.com/fJKhmlL
NOTE: the K3S for this demo was set for its MIC::LINE INPUT amplification setting on the K3S menu//(SPEED MIC DELAY)knob at a level of "4"
NOTE: for CW using AFCW mode, it is important to keep the CW AUDIO input to the K3S LINE INPUT low enough NOT to engage the RIG's ALC, which if activated will cause distortion on your CW elements and cause some harmonic distortion, which is undesired...it is also set HIGH ENOUGH so that full power is still available ....
through trial and testing...this value when using the level of "4" for the K3S's SPEED MIC DELAY knob line input amplification setting as described in the paragraph just above...is around "-6 db" for the CW VOLUME usb sound card transmit LSB line input volume
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