While we are discussing GPS, I have a question for all of you.
I bought a few months ago an OEM 5000  GPS board, made
circa 1993 by Magellan, because someone had told me that
on the interface there were available the 1 pps signal derived
from the received signals from the satellites, with the accuracy
and stability of their Cesium clocks, +/- the SA.

I was intending to homebrew something similar to the Shera
project appeared in a past issue of QST.

I have been unable to find that 1 pps signal, however. It just seems
not to be present on the interface. But there is a hope.
A few pins do not have signal on them, as seen on the 'scope,
but they have traces on the PCB leading somewhere. My last hope
is that the 1 pps signal must be enabled by some command to the
GPS unit.

Can anybody shed some light on this ? Anybody on this list that
has experience with the Magellan OM 5000 ? Thanks for any advice.

Alberto    I2PHD