Re: [RTTY] FSK Keying of TS-590SG

[Jay <ws7ik7tj@gmail.com>]

+2
I have also used these interfaces for a long time.  Both transistor and 
also opto's.  Only thing I found was that in PTT part that different 
radio's require much different resistor values.  Even two old FT-1000's 
required different values.  From 500 to 1500 ohms. FSK was never a problem.
Used Opto's when the computer had built in com ports 100% to just 
protect the computer as on-board problems that might have been caused -- 
never did see any difference in performance so went back to 100% 
transistors as they fit better in a connector and don't require a box.
Jay WS7I


> +1
> Since 2003, I've made over 75 of these interfaces for Kenwood, Icom, Yaesu and Elecraft radios.  I 
> wire the components point-to-point inside the DE9 connector hood that connects to the Serial port.  (If 
> the PC doesn't have Serial ports, then I use the Edgeport USB-Serial adapter.)  The other end of the 
> cable has the appropriate connector for the specific radio.  The result  is a single cable that has 
> worked perfectly in all cases.
> I've  never found the need for an opto-isolator solution that some people use 
> instead of the resistor-transistor level-shifter circuit on Don's site.
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