Hello, All-- Darrell Robinson said:
My guess is that at least some of the difference that you see in your altitude is from the propagation delay in the cable between your antenna and the GPS module. Guessing still further, I would think that the position as reported would be some distance immediately below the antenna. How long is your cable? -------------------- Just for the sake of illustration, lets suppose that the antenna is on my roof 20 feet above the ground but that it took 150 feet of cable to get to the receiver. Presumably, with no other information, the determined altitude would be offset by the delay in the cable giving a 130 foot error? It would seem natural that the receiver would be (should be?) able to be told how long the antenna cable is so that it could factor out the delay. However, I do not see any place in any of the control panels to input a cable length correction. Mike Baker WA4HFR Micanopy, FL _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.