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From WM2U (Who has an excellent website) comes these designs and is what I use with some slight modifcations and integration.
This PTT circuit utilizes the DTR (top) or RTS (bottom) from your serial port to key your rig. It only takes a few minutes to put together and cost a couple bucks for the parts.
Simple isolation using a transformer from Radio Shack. Helps stop ground loops.
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