I don't think the parallel port is going away very soon, but the serial port has all but disappeared on new mother boards. I just bought a new PC, and when I chose which model, I was careful to get a real serial port, but you do have to look if you want one.
Steve/WM5Z Just because you say I'm paranoid doesn't mean they aren't watching us. Alan Crosswell wrote: > I'm curious what hardware interfaces people are using these days for PTT > for soundmodem? So far, the old computers I use for aprsdigi are still > old enough to have a parallel port so I use a 2n2222 PTT setup, but > pretty soon that's no longer going to be the case. A long time ago I > tried the VOX-based PTT ckt but was not successful with it. > 73 de N2YGK > > > Gary Huntress wrote: > >> Thanks to everyone for all the replies. I definitely needed to change the >> permissions on the xastir binary, that helped. The permissions on >> /dev/soundmodem0 were already 777 so I didn't do anything with that. >> >> FWIW, on the same box, I'm running an XP virtual machine with soundmodem and >> it is receiving. I shut down that VM and switch to Ubuntu and I'm not >> getting anything. I have to assume it's something with ALSA, the various >> capture devices, or mixer settings. >> >> Thanks for the help. I may just switch to a hardware TNC if I can find a >> decent one supported by linux! >> >> Gary H. >> KB1QOJ >> >> >> On Sat, Dec 6, 2008 at 2:49 AM, Andrew Errington < >> [EMAIL PROTECTED]> wrote: >> >> >> >>>> I suspect if a few of us who have set it up before got together and >>>> wrote a step-by-step on the Wiki, we'd be able to keep it up to date from >>>> then on. I've got many years under my belt with AX.25 on Linux (KISS >>>> TNC's attached to real serial ports). I've only done >>>> soundmodem setups a few times and never set up transmit with it. >>>> >>>> >>> Crikey. I thought I was way behind the curve with a lot of catching up to >>> do! I've been busy in the last couple of weeks. >>> >>> I built a radio cable using the parallel port to control PTT and I was >>> very pleased when it actually worked. There were three issues I had to >>> deal with: >>> >>> 1) Permissions on the soundmodem0 device. I mentioned how I solved this, >>> but Curt has give the correct answer, which I will have to do. >>> 2) I was using a handheld radio with PTT combined with the mic. signal. I >>> had to put a capacitor in the line from the PC audio out otherwise PTT >>> just pulled the audio signal straight to ground (many PTT circuits don't >>> show this). >>> 3) Tweaking the sound mixer settings to coax the audio driver to work >>> properly. For some reason the mic. input on the laptop doesn't work >>> unless I turn the mic. boost switch on then off again. I knew this was an >>> issue on this laptop as I have the same problem with Skype. >>> >>> After that it Just Worked. Thanks to the XASTIR dev. team for much >>> coolness. >>> >>> 73, >>> >>> Andrew >>> ZL3AME >>> >>> _______________________________________________ >>> Xastir mailing list >>> [email protected] >>> http://lists.xastir.org/cgi-bin/mailman/listinfo/xastir >>> >>> >>> >> _______________________________________________ >> Xastir mailing list >> [email protected] >> http://lists.xastir.org/cgi-bin/mailman/listinfo/xastir >> >> >> > _______________________________________________ > Xastir mailing list > [email protected] > http://lists.xastir.org/cgi-bin/mailman/listinfo/xastir > > _______________________________________________ Xastir mailing list [email protected] http://lists.xastir.org/cgi-bin/mailman/listinfo/xastir
