Ultimate2 kit status summary-GPS

g3zjo #1147 On 19/05/2013 12:46, Hans Summers wrote: My current theory is that the short pulse width from some GPS modules is interfering with, or being interfered by, the incoming serial data stream. The Trimble is stated as PPS < ???25 ns @ 50% and werks beaufull. Eddie
Hans Summers #1167 Hi Eddie? > My current theory is that the short pulse width from some GPS modules > is interfering with, or being interfered by, the incoming serial data > stream. The Trimble is stated as PPS < ±25 ns @ 50% and werks beaufull. By 50%, you mean the duty cycle is 50%? If so, this would support my theory that this issue is related to very short pulse widths on some GPS modules. 73 Hans G0UPL
g3zjo #1168 On 20/05/2013 22:27, Hans Summers wrote: By 50%, you mean the duty cycle is 50%? If so, this would support my theory that this issue is related to very short pulse widths on some GPS modules. :-) . I don't know, I hoped you would. PPS < ???25 ns @ 50% was copied from the manufactures data. Its very short, I can't see it on my scope all I can get is a trigger from its leading edge so I knew it was there. 73 Eddie

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