Voice keyer Interface by G3SEK
|AF to MIC input ||1200 Ohm, <1Vpp|
|AF from SPKR output ||75 Ohm, <1Vpp|
|FT1000MP connection ||DVS2 connector|
|PC connections ||Sound card and serial port|
This voice-keyer-interface is designed by Ian G3SEK, based on the design by Mark G4AXX. It provides complete galvanic isolation of all lines between an FT1000MP and a computer.
The RS232 interface, CW and PTT lines are all opto-isolated, and audio transformers are used between the radio and the sound-card.
The DVS2 connector on the FT1000MP provides the audio in, audio out, PTT and 9V (4mA) for the radio side of the interface.
A battery (PP3) is used for the positive supply on the PC side of the interface. Current consumption is 10uA average (<<1uA quiescent).
The negative voltage rails on either side of the interface are derived from the RS232 lines, this requires the specified low-current opto-couplers to be used.
Click on a thumbnail below to see a larger picture.
General inside view
unique visits since Nov 2005