Rev E TR-220 90 008 088-1
2-43
2.17 Mode S Enhanced Surveillance
NOTE
The TR-220 is capable of testing Mode S Transponders with Enhanced surveillance (EHS)
capability. Access to the EHS menu is as follows:
If utilizing the Directional Antenna, select SETUP using the UUT FUNCTION switch and complete
the procedures in paragraph 2.9.1. Utilize paragraph 2.9.2 if using the supplied direct connect
cable.
1. Connect the antenna or direct connect cable as appropriate.
2. Turn the Test Set “ON” by toggling the ON/OFF switch to the ON position.
Ensure the green LED illuminates.
3. The Test Set commences the Self-Test. “PASS” is displayed briefly if no failures
are detected.
4. Turn the UUT FUNCTION switch to the XPDR position. The Test Set will
automatically determine the transponder capability as being Mode S capable and
display the appropriate start page with the COMM A, B, C & D capabilities also
listed if applicable.
5. Press the TO/START-FROM/STOP switch upwards to the TO position to access
the EHS menu.
6. EHS testing can be carried out using 3 UF/DF combinations. Press the UP-
DOWN switch to the “UP” position to select UF5/DF21, UF21/DF21, and the
UF0/DF16 as applicable. The results displayed will be the same for each
selection.
Self Test
PASS
Capability COMM ABCD
Press AUTO/MANUAL
Mode S Enh. Surv.
Using UF5/DF21 . . .
All illustrations shown are for demonstration purposes. Though the test
results may be typical, they are not meant to replace manufacturer
recommendations or ACTUAL results
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