AS 680/682
Installation and Setup Description, Operation and Maintenance
ADS−B
3−28 Ed. 10.07
3 Verify that the earthing of all cables is done according to standard.
4 Make sure the blue exchange cables (between SPU/RXU, SPU/GTS and the arriving low−loss
cables) are properly connected and not twisted or sharply bent.
5 Verify that the second output of the Site Monitor (unused) is terminated using the supplied 50 ohms
terminator.
3.6.3 Electrical Connection of AAU, SPU, Site Monitor, active GPS Antenna
1 Make sure the Ground Station is properly connected to 24 V DC power supply and that a protective
earth strap is applied to the protective earth bus bar.
2 Make sure the Site Monitor is properly connected to 24 V DC power supply and that a protective
earth strap is applied to the protective earth bus bar.
3 Verify that jumper X3 on the SPU RXU is set to provide AAU with 12 V DC feed on its input RF line.
4 When the SPU is powered (switched on) measure the voltage arriving at the AAU output. Discon-
nect the cable from the AAU and measure the voltage between the cable’s centre conductor and
shielding. The measured voltage must be between 11.2 and 12.2 V DC. Document the measured
voltage in the SIR.
5 When the SPU is powered (switched on) measure the voltage arriving at the active GPS antenna
cable output. Disconnect the cable from the antenna and measure the voltage between the cable’s
centre conductor and shielding. The measured voltage must be between 4.0 and 5.5 V DC. Docu-
ment the actual voltage in the SIR.
3.6.4 RF properties of Antenna cables and Receiver adjustment
1 Measure the cable insertion loss at 1090 MHz of ADS−B antenna−AAU cable, ADS−B cable, Site
Monitor Cable and document the result within the SIR.
2 Connect a suitable digital storage oscilloscope to the monitor output of the RXU.
3 Set the DSO input characteristic to high impedance (e.g. 1 Mohm) and DC coupling, trigger to au-
tomatic.
4 Switch on the Ground Station.
5 Verify that the noise level is shown on the DSO screen at +300 mV (refer also to section 3.2.6).
6 Make a screenshot to document the setting and check the appropriate box in the SIR.
3.6.5 Configuration of Site Monitor
1 Switch on Site Monitor.
2 Verify Site Monitor BITE Status is OK (Fault LED goes off after 1 min).
3 Connect the LCMS serial cable to the Site Monitor maintenance port and the other side to the
USB−to−serial converter. Connect the USB−to−serial converter to the LCMS.
4 Start the LCMS and login as supervisor. Supply the appropriate password.
5 From the desktop start the terminal application minicom from either the Misc. Tools menu of the
application panel or the context menu (right mouse button on desktop background).
6 Enter the command getall<enter> to retrieve and document the current site monitor configu-
ration.
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