Thanks for the info! I was adjusting the levels with alsamixer, which I suspect is a digital mixer. I hadn't thought of the potential issues there.
I was using the onboard sound, but I also have a "higher quality" Soundblaster sound card. Do some of these vary in quality so much as to be unable to decode IRIG at all? I think I will deploy PPS; I'd also like to deploy something to set my time myself (IRIG sounds good), but I realize its not required. I haven't taken time to find all the connector-pieces to make the required custom cable yet to do PPS; I had the parts on my shelf to dump IRIG into my Line In on the sound card. A related question: for my IRIG out, should I directly dump that into the sound card, use one BNC-T with a terminator, or two BNC-T's with terminators, and pull the connection there? Does it matter? Thanks! --Jim On Mon, Mar 7, 2011 at 11:36 AM, Chris Albertson <albertson.ch...@gmail.com> wrote: > There is an NTP email list. questi...@lists.ntp.org > > But really, all you need is the 1PPS output and some pool servers. > If you have PPS working then all you need is a way to number the > seconds and "anything" can do that. Yes the PPS driver works with > other non-NMEA ref clocks > > It would be good to get IRIG working. One thing you don't say is how > you are adjusting the levels. Is it a digital control or an analog? > In general you want to keep any digital control at maximum. Reducing > it even a little causes loss of dymanic range and reduces the > effective with (number of bits) of the sample. In the extream case > your nice 24 bit WAV file is turned into 4-bit wide samples. Such is > the nature of integer math. > > Also if you are using the bui8lt-in sound on some PC, quality varies a > lot. I'd start with a quality external audio interface. But eiother > way. I think the first step is to look at the audio. capture some to > a file then look at the waveform using an audio editor. Check for a > reasonable amplitude with no clipping. You will need to adjust the > analog gain to get a good signa > > > -- > ===== > Chris Albertson > Redondo Beach, California > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.