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THE REED RELAY KEYING INTERFACE

THIS IS A VERY SIMPLE RADIO KEYING INTERFACE THAT WORKS FROM THE 9 PIN COM PORT IN THE BACK OF YOUR COMPUTER (make sure its got one first) THIS INTERFACE WORKS WHEN THE OPTO TYPE FAILS TO KEY SOME RADIOS.

THE JH12N RELAY IS ON SALE AT MAPLINS £1.31p: http://www.maplin.co.uk/Module.aspx?ModuleNo=2605&criteria=REED%20RELAYS&doy=30m6 AND A SMALL DIEODE, THE DIEODE IS VERY IMPORTANT FOR THIS INTERFACE.

THE RELAY LOOKS LIKE A SMALL TUBE WITH 4 PIN OUTS ON THE BOTTOM, YOU CAN USE PIN 7 (RTS) ON THE COM PORT OR PIN 4 (DTR).