Phases Two and Three
I have taken Chuck's Phase Two and Phase Three and combined them into this post. Basically, he has you build then keyer circuit and install and test the chip. Additionally, the transmit keying circuit and receiver muting circuits are tested.
|Project schematic completion.|
|Audio and keyer circuits.|
|Whole board including the keyer circuit and muting circuit.|
The Phase Three checkout involves setting the keyer into straight key mode and then keying the unit and measuring various places around the board to see it the keying circuit sends +12 volts when keyed.
Up next is Phase Four which tests the newly constructed demodulator to see if you can get an 8,064 kHz signal through U6 into the audio chain.