TRT800H / P/N 800ATC-H-(2xx)-(26x)
Operation and Installation
37
Document-No: 03.2126.010.71e / Revision: 2.00
The NAC value can only be configured if the GPS protocol is
set to either FREEFLIGHT or NMEA_RAIM. In this case,
one can choose either "0" (unknown accuracy) or "AUTO"
(NAC will be set according to the data provided by the GPS
receiver).
For all other protocols, the NAC value will automatically be
set to 0.
GPS Protocol NAC
configurable
NAC setting
AR-NAV,
NMEA_4800,
NMEA_9600
No
0
Unknown Accuray
FREEFLIGHT,
NMEA_RAIM
Yes
0
Unknown Accuray
AUTO
NAC is set automatically
based on GPS receiver
provided data.
4.4.4 Altitude Correction/Offset
The TRT800H has an integrated, temperature compensated high-
precision pressure sensor. This sensor is factory-calibrated so that it will
yield accurate flight level (uncorrected pressure altitude) within the entire
altitude range.
However, due to differences in calibration of the TRT800H pressure
sensor and the altimeter in the cockpit, it may become necessary to
adjust the TRT800H pressure readings so that the value indicated and
transmitted by the TRT800H corresponds to the indication of the primary
altimeter seen by the pilot within 125 feet (as specified in ETSO
C88a/SAE AS 8003).
Setting for all described GPS-systems:
1 ... 2 position messages per 2 sec.
Setup
→
4.5.5
