Ah, there was something wrong between the scope and DUT.. Me! I had the scope set to using x10 probe when I was using x1 probe.. So that is 3.3 peak to peak AM and carrier is 2v peak to peak..
I think it's something to do with the ALSA emulating OSS (/dev/audio and /dev/mixer) --marki -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Joe Gwinn Sent: Sunday, 11 August 2013 1:37 AM To: [email protected] Subject: Re: [ntp:questions] irig-b LEVELS In article <[email protected]>, Mark C. Stephens <[email protected]> wrote: > I have a Datum 9390 and the Thin client I want to feed the IRIG signal > into only has microphone level input. > Looking at the signal on a scope, unterminated its 33v peak to peak > with about a 20v peak to peak 1KHz carrier into an unterminated load. > Levels go down to about 1.2v into 100K load. > > Can anyone tell me if there is a standard level (preferably in dB) for > IRIG-B signal out of a receiver? There is a wide amplitude range, to account for attenuation and loading from multiple receivers. Find a copy of the IRIG standard. Start here: <http://en.wikipedia.org/wiki/IRIG_timecode>. Joe Gwinn _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
