As I mentioned earlier, the RS-232 interface board that I built is for a
non-NTP/non-Time-Nuts project. But, if I can make it useful in those
applications, great. I am not going to add any parts to the board for them.
That said, the MAX3232 chip has an extra RS-232 receiver on it. I can use it
as an inverter and supply either polarity 1PPS signal to the RS-232 connector.
It does add up to 300 nS delay to the 1PPS signal. I also added a bunch of
0.1" spaced feedthroughs to the board (under where the GPS modules would sit)
as a prototyping area.
I tried my application with two of the CN06 receivers. It calculates the
range and bearing between them. With the boxes only a couple feet apart, I
was typically calculating 2-5 foot distances with a pretty reliable bearing
indication. That error is at the limit of what single-precision math can
deliver (processor is an AVR chip). Those are pretty slick little GPS
receiver modules for 22 bucks...
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