[time-nuts] NMEA Time

[Bill Janssen]

paul swed wrote:
> Sorry no idea.
> It will however be offset from time if your source encodes rs232 and then
> you decode it...
> Easy way for everyone with a short wave receiver and scope would be to
> measure the tick on 1 channel and if I recall the pulse out or you can also
> look for the IRIGB leading data. As I recall its fixed and you can see it as
> a pattern
> But adding a server and etc I am sure its close to 1 second.
> Just did not have a need to get that detailed.
> I run gps connected to a pic that drives a home brew irigb gen and that
> drives numbers of decoders.
> The pic does several things. It extracts the time from gps and then
> calculates the proper time to acount for the irigb encoder delay.
> Essentially I output the next second ahead of 0 time.
> Liked all of this pretty well and did essentially the same trick with a
> smpte tc generator using jam sync. Works very well. I jam every 10 minutes
> so that its always on time. If power fails I jam as soon as things are
> stable within 10 seconds.
>   
Are the PIC and irigb encoder written up any place. I have a couple of 
GPS receivers and
an irig display and I would like to connect them. Been meaning to build 
an irig encoder myself.

Bill K7NOM