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LMM for the Kodiak 100
Page 7-33
190-02102-00 Rev.4
NOTE
The air/on-ground mode logic mutes the aural TA while GSL altitude is
below 400 ft.
7.9.3 GTS 800 Antenna Functional Check
NOTE
The GTS 800 must be in Ground Test mode to perform antenna verification
testing.
NOTE
If an IFR 6000 ramp tester is used with a GTS 800, the IFR 6000 can be
configured for a distance that is 4 times the actual distance. For example, if
the ramp tester is located 10 ft away from an aircraft, the IFR 6000 should
be configured as if it were 40 ft. away from the aircraft. This will adjust the
MTL setting of the IFR 6000 so it will see the GTS 800 low power interroga-
tions and reply to the interrogations.
1. The first step in antenna verification is to make sure auto-calibration operates
without indicating a fault.
2. With the GTS powered up and the TAS STBY softkey indicated green on the
MFD, press the TAS OPER softkey. Each time the GTS Processor transitions
between these modes, a self-test of the antenna circuit is initialized. If the
antenna connection is not correct the MFD will display ‘Failure’ indicating it will be
necessary to recheck the antenna coaxial connections. If the MFD displays
Operate without indicating a fault, proceed to the next step of antenna
verification.
3. Using a ramp tester, such as a TIC TR220 or equivalent, make the following set
up and measurements to ensure the antenna is properly connected and the GTS
is operational.
4. Position the test set directional antenna with a clear line of sight to the GTS
antenna.
5. Ensure the transmitter or receiver (RX/TX) under test is significantly closer to the
ramp tester than another operating RX/TX, or erroneous and inaccurate results
may occur. All four quadrants (forward, starboard, aft, and port) will be similarly
tested to check bearing of simulated intruder supplied by the ramp tester are
correctly displayed on the MFD.
6. Using the ramp tester, select the proper antenna gain and distance to aircraft.
7. Position ramp test set at 0 degrees.
8. Turn on the test set.
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