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1.3.7.2
UAT Antenna
The GDL 90 requires a UHF antenna meeting the following specifications:
Standard 50 vertically polarized antenna with a VSWR < 1.7:1 at 978 Mhz
TSO-C66, C74, C112 or C154 antennas that also meet the VSWR specification.
Certain types of transponder antennas that utilize very thin radiator elements are only
intended for use at 1030 and 1090 MHz. These types of antennas should be evaluated on
a model-by-model basis to determine their suitability as UAT data link antennas.
Operating the GDL 90 with no RF terminations on the Top or Bottom UAT Antenna
ports can result in equipment damage. Always operate the GDL 90 with the Top and
Bottom UAT Antenna ports terminated with a VSWR ratio of 3.0:1 or less.
1.4 R
EGULATORY
1.4.1
TSO
AND
TSO-C154
Broadcast (ADS-B) Equipment Operating on the Frequency of 978 MHz.
TSO-C145A
Unauthorized changes or modifications to the GDL 90 may void the compliance to
required regulations and authorization for continued equipment usage.
1.4.2
TSO A
UTHORIZATION
Function
TSO
UAT
TSO-C154, Class A1H, B1
Transceiver
GPS/WAAS
TSO-C145A, Class 1
1.4.3
FCC G
RANT OF
FCC regulations for UAT are not yet finalized.
regulations and international agency proposed regulations. Garmin AT has applied for a waiver
for UAT use in the United States during the interim until FCC regulations are adopted. Testing
was completed on the GDL 90 Universal Access Transceiver and documented in PD3621, GDL
90 UAT FCC Certification Report. The data show compliance with FAA TSO-154 and FCC
proposed rules to Parts 2 and 87 as commented in Docket No. 01-289. The data further
GDL 90 Installation Manual
CAUTION
C
OMPLIANCE
A
C
DVISORY
IRCULAR
Universal Access Transceiver (UAT) Automatic Dependent Surveillance –
Airborne Navigation Sensors using GPS Augmented by WAAS
Table 1-1. TSO Authorization
E
QUIPMENT
560-1049-00 Rev B
NOTE
R
EFERENCES
NOTE
Minimum Performance
Standard
RTCA/DO-282
RTCA/DO-229C, Class 1
A
UTHORIZATION
The GDL 90 meets the proposed FCC
General Information
Software
RTCA/DO-178B
Level B,C
Level B
1-9
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