3June09 ~10:15MDT
The Li7500 that was at 2m was raised to 4m per request by SO/TH.
It has the same serial port in xml config., but the height qualifier was changed from 2m to 4m also.
NOTE: Retained the mounting arrangement so we moved the sonic from 2 to 4 along with it,
and thus the 4m sonic to 2m as well. Will change the serial number entry for this