At 23:36 01 April 2007, John Scott wrote:Our club has an EW Model D logger. In the process
of getting things ready for flying this year, I got the loggers out, put in
fresh batteries, and did a test run in the car. I got a strange altitude plot
from the EW model D. It was very 'notchy'' with the altitude not changing
for several samples, and then jumping. This was true for both the pressure
altitude from the internal sensor and the GPS altitude from the Garmin.Looking at the altitude graphs on SeeYou and at the
actual log file in Notepad, I could correlate the 'flat sections' with
multiple sequential B records where the altitude would not change for either
the pressure altitude or GPS. The pressure altitude only changes in increments
of 5 meters. It is always a multiple of 5 meters. The GPS altitude
is always a multiple of 10 meters.Anyone have any thoughts or suggestions?John Scott JohnYou have tested the system in a car, so the height
changes are small and happen slowly. The model 'D'
records in 5 metre steps, so what you describe is exactly
what we would expect to see, there is nothing wrong
with the unit.RegardsGraham Paul