Dire Wolf like the AGW-PE has the capability to be used as a dual-port TNC. You
can connect two radios on different bands at different baud rates to the stereo
sound card in a desk-top computer. Using this configuration I have configured the
first port to the "left" channel S/C and key via the RTS lead from the COM port. The
second port is on the "right" channel S/C and keyed via the DTR lead of the COM
The reference to a suitable interface can be a reed relay or an optoisolator (4N25). Simply connect the RTS or DTR lead thru the windings of the relay or thru the
optoisolator. Detailed schematics of these circuits should be an easy search on the
I have used this configuration to digi 300 baud APRS traffic from 30m to the local
2meter 1200 baud APRS network .
I mentioned 'desk-top computer', this is because many laptops do not have stereo
line-in jacks, just mono.
I'm trying to set up the config file in Direwolf. The radio is a Yaesu FT290RII and
the interface is a Signalink USB. The Direwolf manual says this about setting up the PTT configuration: # # If not using a VOX circuit, the transmitter Push to Talk (PTT) # control is usually wired to a serial port with a suitable interface circuit. # DON'T connect it directly! # # For the PTT command, specify the device and either RTS or DTR. # RTS or DTR may be preceded by "-" to invert the signal. # #PTT COM1 RTS #PTT COM1 -DTR #PTT /dev/ttyUSB0 RTS Unfortunately, I don't know what that means. Anybody know which one I should
use? Any hints, tips, suggestions would be much appreciated.
Steve Kristoff AI9IN EM79ji Oldenburg IN skristof at etczone.com