Open interface III

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!!Not staffed parts *'''R6''' package 0805 - activate voltage divider with R9, can reduce audio signal output level *'''C71''' package C - will increase RX audio preamp gain *'''C50''' package 0805 - activate Left channel output (TX) from USB sound card *'''D15, D16, D17''' package 0805 - always activate PA PTT output (solved in firmware via sequencer function) *'''JP1''' two pin jumper - short on PCB
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