Voice keyer Interface by G4AXX

Specifications AF to MIC input 1200 Ohm, <1Vpp AF from SPKR output 75 Ohm, <1Vpp Power requirements +9V, 4mA from DVS2 connector CW key parameters +4.5V pull-up by MP, 2.2mA sink

Opto-couplers and screened audio transformers are used to isolate the connection between the sound card and the MP. The RS232 interface is not isolated, it connects directly from the PC to the CAT port. The PTT and audio in and out on the DVS2 connector on the rear of the MP are used.

In SSB mode using Writelog there is a switch on the Voice Keyer to put the MP into either "Record" or "Play" mode. CVB does this automatically from the COM port on on the DTR line.

In CW mode with Writelog, configure SETUP|PORTS, select "CW on a COM port", and tick the box selecting "All mode PTT on CW port RTS".

• Click here to download schematic diagram of the Sound Card - FT1000MP Voice & CW Interface (PDF 27.7kb)

	General inside view
	Inside close-up
	Close up of the side with the DVS2 cable connector and CW Key in & out.
	Close up of the side with the sound card MIC, SPEAKER, COM port cables and MP CAT connector.