[RTTY] Keying circuit interface

[k0bx@qsl.net]

This subject comes up all the time at local meeting.  They guys are always asking me what I use for rtty.  I have made several of the homebrew interfaces and mostly have use the transistor keying circuit from Dick's webpage.  I am glad to see that Don has put the transistor circuits on his webpage.  
I though I would tell you what I have done.  There is a guy that sells all the parts with a nice circuit board for $26.00 for an PSK31 audio interface. http://www.packetradio.com/psk31.htm  He calls it a Rascal.  It is really nothing special except that it is a kit and you can get the correct connector for your rig.  But it is nicely done and has the transformers for the audio.  What it doesn't have is CW & FSK.  So using the two transistors circuit I added a small perfboard inside his interface box.  He already has a dB9 connector for PTT, so the wires for CW and FSK are already there.  Also if your rig supports FSK from the DIN plug on the back, he has all the wires for it.  In my case, I am using a TS-850S, I had to have seperate cables out of the box for CW and FSK.  There are many interfaces out in the market, they are all good, I only decided on this one as for the price I could hardly buy the parts, and since it was a kit, I was able to add the CW and FSK in the same box while I was building it.
The circuit and other information is on my website at http://www.qsl.net/k0bx
cu at Dayton
Joe K0BX