I didn't comment at the time because I haven't tried it, but your
tip of using an LED to detect the PPS signal I am fairly sure would
not work on the Trimble GPS, its too quick for the Scope so I don't
think the eye would catch it.
I suppose there is only one way to find out.
Plonk an LED On the output via a 2k2 and see what happens ;-)
On my UP501 module I intended to have an LED connected all the time
but it loaded it sufficiently to stop the U1/U2 from seeing the pulses
so I decided on option 2.
Use a push to make button on my GPS box as a simple way to test that
the GPS had acquired satellite data and was working. Otherwise I was
forever working blind.
From a cold start I usually have to wait about 10 mins for the
GPS to sort itself out. I just push the little button every few
minutes to see if it's got a lock. Once my green led start blinking
I release the button to take it back out of circuit and then switch
on the U1/U2 and let it all fly.
So simple, yet so useful.
73 de Andy
