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DVOR 432
Alignment Procedure
Operation and Maintenance
Annex Nextfield
AN-26
Ed. 01.04
4.7
RECORDING OF ERROR CURVE
4.7.1
Error Curve of TX1
a) Switch on TX1.
C
Switch TX1 On
b) Note down 'T1 Azimuth Alignment' value.
A/EC
NOTE:
Important for h)
c) Shift 'T1 Azimuth Alignment' for a 'M1 Azimuth Dipole 1' reading
A/EC
T1 Azimuth alignment
of 000.0°
---,-°
NOTE:
Range of value: 0...359.9. This measurement is performed with diĆ
pole 1 only
d) Record in test sheet (Fig. 4-8) reading of 'M1 Azimuth Dipole 1'
(e.g. 0.0°) as 1st value.
e) Set "Start Antenna Normal Operation" to antenna 3 and record
A/EC
T1 Start Antenna
reading of 'M1 Azimuth Dipole 1' as 2nd value in test sheet.
Normal Operation
Antenna-3
f)
Incrementing the next but one antenna is selected as 30 Hz phase
reference. Record azimuth reading of 'M1 Azimuth Dipole1'. Con-
tinue this way until all 25 measurement values have been recorded.
The measured values have to increment in steps of 14.4°. Record
the differences from these nominal values in the error column.
A typical error spread is <
±
0.4°.
g) Set "Start Antenna Normal Operation" to antenna1.
A/EC
T1 Start Antenna
Normal Operation
h) Key in azimuth value noted down in in b) again.
A/EC
T1 Azimuth alignment
---,-°
4.7.2
Error Curve of TX2
Perform an error curve measurement for TX2 in the same way as for
TX1 (4.7.1).
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