User's Manual

Model 1150A DVOR
Rev. - November, 2008
This document contains proprietary information and such information may not be disclosed
to others for any purposes without written permission from SELEX Sistemi Integrati Inc.
9-21
9.7.13.6
Setting Transmitter SBO Modulation
a. Set TX1 and TX2 circuit breakers to the ON position.
b. Place Transmitter 1 on the antenna by pressing the Main #1 button on the LCU or PMDT.
c. Place the monitors in bypass.
d. Select Monitors>>Data and view the 9960 Modulation level.
e. Adjust Transmitters>>Configuration>>Offset and Scale Factors>> Tx Sideband RF Level Scale for Tx #1
so that Monitors>>Data 9960 Modulation level is 30%.
f. Place Transmitter 2 on the antenna by pressing the Main #2 button on the LCU or PMDT.
g. Adjust Transmitters>>Configuration>>Offset and Scale Factors>> Tx Sideband RF Level Scale for Tx #2
so that Monitors>>Data 9960 Modulation level is 30%.
9.7.13.7
Setting Transmitter Azimuth (Az) Index
a. Place Transmitter 1 on the antenna by pressing the Main #1 button on the LCU or PMDT.
b. Select Transmitters>>Configuration>>Nominal. Set the Azimuth Index to 0.00 degrees.
c. Select Transmitters>>Configuration>>Offsets and Scale Factors. In the Tx #1 Azimuth Angle Offset enter
the Az offset from -20.00 to +20.00 as needed so that the field monitor reading matches the expected result
from survey information. For example if the field monitor location was surveyed to be at 30 degrees then
the monitor should read 30 degrees. After a new Az offset is entered then press [F7]. Transmitter No. 1’s
new Az index will be entered into the station’s temporary memory.
d. Place Transmitter 2 on the antenna by pressing the Main #2 button on the LCU or PMDT.
e. Select Transmitters>>Configuration>>Offsets and Scale Factors. In the Tx #2 Azimuth Angle Offset enter
the Az offset from -20.00 to +20.00 as needed so that the field monitor reading matches the expected result
from survey information. For example if the field monitor location was surveyed to be at 30 degrees then
the monitor should read 30 degrees. After a new Az offset is entered then press [F7]. Transmitter No. 2’s
new Az index will be entered into the station’s temporary memory.
NOTE
AZ index is used to rotate the RF signal pattern so that the Monitor reading for the field monitor
antenna matches the surveyed location for the antenna. During commissioning flight inspection
corrections will be made to each transmitter to match the position determined by the flight
inspection system.
9.7.13.8
Saving No. 1 Transmitter Operating Parameters
a. Select RMS>>Config Backup and then press [enter]. This will place the Transmitter’s new operating
parameters into electrically erasable memory. By means of the lithium battery, The Transmitter’s operating
parameters are preserved in static ram if system power is lost. The electrically erasable memory is an added
precaution against the loss of setup parameters.
b. A permanent copy should be placed onto the PMDT file system. Select System>>Configuration Save.
You will be prompted for a file name. It is suggested that the configuration is saved into different files
depicting progress up through the commissioning with different file names for each.
9.7.14
Setting Monitor Alarm Limits
Once Transmitter No.1’s operating parameters have been set it will be necessary to check/set the Monitor alarm
limits. Refer to Section 4 for appropriate limits.
9.7.14.1
Setting Monitor Az Angle Low Limit
a. Select Monitors>>Configuration>>Alarm Limits. The Alarm and Prealarm limits will be displayed for
Monitor 1 and Monitor 2.
b. Enter the Az Angle Low Alarm Limit that is needed, then press [F7]. Monitor No. 1’s new Az Angle Low
Limit will be entered into the station’s temporary memory.