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

[groupsrichart@gmail.com]

Jim,

Thanks for the tip on the 4N33...I think I have a couple somewhere in my 
junk box!
73,
Tim WS4V

On 2/23/2018 8:38 PM, Jim W7RY wrote:
> I use 4N33 opto isolators. Which is a Darlington unit.
>
> Have an LED and a 470 ohm all in series between the serial port and 
> the optoisolator.
> 73
> Jim W7RY
>
>
> -----Original Message----- From: Bob Burns W9BU
> Sent: Friday, February 23, 2018 4:53 PM
> To: rtty@contesting.com
> Subject: Re: [RTTY] FSK Keying of TS-590SG
>
> On 2/23/2018 2:49 PM, groupsrichart@gmail.com wrote:
> > I have tried two different interfaces using optoisolators to attempt 
> > FSK and PTT keying from a serial card to the rear panel ACC2 connector.
> I used an interface very similar to this one
> (http://www.w3yy.com/fsk.htm) for a few years with my Icom IC-7600. It
> worked very well when driven by a real RS-232 COM port on a desktop
> computer. I can't tell you the optoisolator part numbers, but it worked
> very well for me.
>
> Bob...
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