[time-nuts] Warning about "slef-powered" RS-422 to RS-232 converers

2017-05-30 Thread Mark Sims
While playing with the RFTG-m GPSO I tried using a couple of RS-422 to RS-232 converters. These converters can be externally powered or "self-powered" by the RS-232 signals. Both units worked fine as long as the RFTG was only sending the 22 character ASCII time code message once per second.

Re: [time-nuts] Fluke PM6681 'fault' or 'characteristic'?

2017-05-30 Thread Magnus Danielson
Hi Ed, Looks kind of reasonable. Signal level and slow phase-drift can illustrate some interesting properties which is sometimes hidden. You have cross-talk and that can interact in interesting ways. You mention low signal levels, and well, this would be consistent with that. You should

Re: [time-nuts] Fluke PM6681 'fault' or 'characteristic'?

2017-05-30 Thread Azelio Boriani
The assumption is that you are using the time interval measurement or phase measurement. The PM6681 datasheet says that the time interval range is from 0ns and the phase range from -180 to 360 deg, usually it is best to avoid the zero degrees zone. Say that your test is another evidence that