"unruh" <[email protected]> wrote in message
news:[email protected]...
[]
Just like the rs232 specs say at least -3V to +3 V for the signals, when
most rs232 cards will accept +.5V to +2 V for the transition levels.
What the specs say and what the card does need not be the same. People
have claimed that the Garmin 18x actually does significantly better than
1us but I have not tested it.
1 us accuracy, not pulse width. GPS 18x LVC. See para 4.4.1
http://www8.garmin.com/manuals/GPS18x_TechnicalSpecifications.pdf
If I had you believing that the Oncore had a width of 1us, I appologise.
That is certainly wrong. I have not measured it, so cannot say what its
width actually is. I have looked at the Sure, and its pulse width is
about 5ns.
No, the Sure unit outputs a 100 ms wide pulse. I have not measured its
risetime. The stated accuracy for "time" is 20 ns, but the Web page does
not state where that 20 ns is measured - it may be internal to the chip.
I would expect it to be neither significantly better nor significantly
worse than the Garmin.
http://www.sureelectronics.net/goods.php?id=99
http://www.sure-electronics.net/download/GP-GS010_Ver2.0_EN.pdf
David
_______________________________________________
questions mailing list
[email protected]
http://lists.ntp.org/listinfo/questions
