CIRCUITS FOR KEYING THE TRANSCEIVER

I HAVE USED THE BELOW CIRCUIT WITH THE PROGRAM WRITTEN BY UA9OSV ( CW TYPE ) WHICH MAKES FOR AN EXTREMELY GOOD CW KEYBOARD, AND IS THE BEST I HAVE COME ACROSS.FOR A BRILLIANT CW DECODE PROGRAM ITS BACK TO UA9OSV'S SITE !  WHICH IS THE ONLY PROGRAM THAT I'VE COME ACROSS THAT REALLY WORKS.T

IF YOU ALSO NEED TO OPERATE THE PTT LINE OF THE TRANSCEIVER, AS WELL AS ITS KEYING LINE CLICK HERE.

CIRCUIT TWO

CIRCUIT THREE

A MUCH SIMPLER CIRCUIT , BUT A HIGH VALUE RELAY COIL WILL BE REQUIRED AS YOU ARE DRAWING ALL OF ITS CURRENT FROM THE DTR PIN OF THE COMPUTER. I BUILT THIS CIRCUIT USING A RELAY ENCAPSULATED IN A 14 DIL PACKAGE DIRECTLY INTO THE 25 PIN PLUG CONNECTED TO MY COMPUTER SERIAL PORT.  MAPLINS DO A RELAY  WITH A 500 OHM COIL & 1 POLE CONTACT, WITH A COIL PULL IN AT 3.7 - 7.5 VOLTS, WHICH SHOULD BE OK.

CIRCUIT FOUR

A CIRCUIT TO ISOLATE THE COMPUTER FROM THE TRANSCEIVER  COMPLETELY IS SHOWN BELOW. FOR MORE INFORMATION ON ISOLATING THE COMPUTER/TRANSCEIVER CHECK THE BELOW LINKS.

    ISOLATING THE AUDIO SIGNAL

   DON'T FORGET THE PTT LINE