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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