FT-817 AFSK data interface using SMD components
I decided to build one of the K6XX data leads using SMT. First, the circuit.
Next, A nice copper clad board, begging for the hacksaw.
Like a knife through butter.
The Circuit design is now cut into the board using a Stanley knife.
A 10k ohm 0805 resistor and MMTB3904, waiting to be mounted onto their new home.
Home sweet home.
The board is now soldered to pins 4 and 5 of the DB9 (PTT control).
Fits very nicely into the DB9 Hood.
A 40dB pad added into the mic plug for the pc sound card; a 100 ohm resistor to ground and 10k ohm to tip (both resistors joined at top).
Other technical articles by Bob K6XX here
FT-817 page from the K6XX website here
Derek M0XDC (email: firstname.lastname@example.org)