Ron, did you mean www.echolink.org ??? 73 John VE3AMZ ----- Original Message ----- From: "Ron Wright" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Sunday, August 19, 2007 4:07 PM Subject: Re: [Repeater-Builder] Simple COR & PTT to Echolink serial port interface
> Eric, > > At www.echolink.com, the echolink folks, sell an interface board for it. > It is a small ~3x3 board with serial port to the computer and I/O for the > repeater. They provide tx an rx audio and ptt. Think also COS. Been > about 5 years since I played with ours. It is still running 24/7. > > The control board has a DTMF decoder and allows one thru the repeater > access nodes, turn on/off connections, enable/disable the echolink, etc. > > I think it cost about $50. We use one here and it simplified things > greatly. The only problem was the audio...the computers often are not at > ground and hum can be a problem. > > 73, ron, n9ee/r > > > > >>From: kk2ed <[EMAIL PROTECTED]> >>Date: 2007/08/19 Sun PM 12:15:23 CDT >>To: [email protected] >>Subject: [Repeater-Builder] Simple COR & PTT to Echolink serial port >>interface > >> >>Good Afternoon, >> >>Has anyone come up with a simple circuit to tie a repeater >>controller's port to a PC's serial port for Echolink? >> >>I have customized a few Rigblaster type units in the past to add COS >>funtionality, but the more I have looked at them, the more I think >>they are a waste of money. >> >>A simple circuit consisting of a few parts should be enough to adapt >>RTS or DTR for a COS signal to the controller, and the controller's >>PTT to the PC's DSR or DCD input. Most of the commercial interface >>boxes don't really offer any advantage to the audio paths, so hooking >>the sound card directly to the controller's audio in/out paths >>shouldn't be a problem. >> >>In the past I've simply tied a radio's COS to the PC's DCD input via >>an isolation diode and current-limiting resistor with great success, >>and used the DTR to trigger an NPN transistor across the radio's PTT, >>but obviously things are reversed on a controller. I was figuring I >>could use RTS as the controller's COS signal, and set the active >>hi/lo on the controller accordingly. For the PTT signal, I might need >>to invert the PTT output of the controller to control DSC or DCD in >>the right active direction. >> >>Anyone have any suggestions or documented circuits before I embark on >>this project? >> >>Eric >>KE2D >> >> > > > Ron Wright, N9EE > 727-376-6575 > MICRO COMPUTER CONCEPTS > Owner 146.64 repeater Tampa Bay, FL > No tone, all are welcome. > > > > > > > > Yahoo! Groups Links > > > >
