AS 680/682
Subsystem Description Description, Operation and Maintenance
ADS−B
2−22 Ed. 10.07
The AAU device comprises the housing with Low Noise Amplifer (LNA) and following options:
Ref. No. 83142 75210 with lightning protection for RF IN, RF filter
Ref. No. 83142 75310 with lightning protection for RF IN, RF filter, input limiter
2.3.3 GPS Antenna
See Figs. 2−2, 2−25.
The GPS antenna (model AT575−68, Part No. 72600 28001) is a receiving antenna for the L1−band
(1572.42 MHz). It receives the SIS signals from the up to 24 satellites of the Global Positioning System
(GPS). The Antenna supplies the GTS DG14 receiver within the SPU. The GPS antenna is an active
unit which is supplied with +5 VDC by the antenna RF cable. The antenna is mounted with four screws
(M3) to an adapter. A mounting kit comprising a tube and 2 clamps is optional available for elongation
of the adapter pedestal and easier fixing to an appropriate support.
bottom view
RF out
TNC
GPS antenna
mounting tube and
GPS antenna adapter
GPS antenna RF connector
GPS antenna and mounting accessories
RF connector (TNC)
990 mm
∅
25 mm
Gasket
Mounting Kit (option) with:
clamps (2x)
Fig. 2−25 GPS antenna and mounting accessories
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