Page 3-11
Installation Instructions
TQG191-IM
Rev 0: 28 Feb 2019
KTX2
Installation Manual
NOTE
All equipment connected to the suppression line should be checked for
correct operation. Use only shielded line.
3.3.5 Ground (WOW) Switch
If a Ground-Switch is connected (and activated in the Setup), the transponder is enabled to
distinguish between weight-on-wheel (On the Ground) and (In-Flight) conditions. In the weight-
on-wheel condition the transponder automatically enters the Standby mode.
In order to complete this installation the input “FLY-GND“ must be connected to a switch,
which connects the input to “GND“ in case there is weight on wheels, or remains open during
flight. For details on configuration please refer to SECTION 4.
3.3.6 GPS Interface
The GPS source must be connected to KTX2 via serial interface (RS232) on pins 2 and 13 to
provide GPS position data for ADS-B OUT.
The interfaced GPS source must be a WAAS GPS unit that is compliant with TSO-C145c. Note
that the NexNav mini (PN 21.000) is currently the only compatible GPS source that provides
sufficient performance to meet the 14 CFR 91.227 requirements.
A proprietary cable for interfacing the NexNav Mini with the KTX2 (PN 312873.0100) is available
from TQ-G.
A separate Power source and circuit breaker are required for the GPS source.
Removal and replacement of the GPS receiver will require a full functional check of the KTX2
system per paragraph 4.5.3.
3.3.7 Antenna Installation Guidelines
This information provides general installation guidance to ensure the installed antennas meet
the requirements for the KTX2.
Installation approval for the L-band antenna is not provided through this AML STC. For
reference only, antennas that are known to be compatible with KTX2 installations are listed in
Paragraphs 2.6.1 and 2.6.2. Consult the antenna manufacturers’ STC, aircraft manufacturers’
data or other FAA approvals for installation instructions for the particular model antenna.
Cable requirements are located in 3.3.2. Cable vendors and approved antenna manufactures
are located in paragraph 2.5.
An example of typical antenna placement, including restrictions, is shown in Figure 3-5. Refer to
the aircraft manufacturer's data and the antenna manufacturer's installation instructions to
mount the antenna IAW the best installation practices outlined in AC 43.13-2B Chapter 3. In
complex cases, the installer may have to use other FAA approved data to gain a separate
antenna installation approval.
Pay particular attention to structural integrity and electrical bonding of antennas installed in
composite aircraft. A generic installation scheme based on AC 43.13-2B 309-310 guidance for
metal, wood/fabric and composite aircraft is described in Figure 3-6.
