Revision 4 - December 17,1998 Ryan TCAD 9900 Series Page 4-4
4.4.3 RAMP TEST, COUPLER
A. Continue to interrogate the host transponder, and conduct this test using the
Ramp Test set up, Paragraph 4.4.1.
B. Press ENRT. Verify TCAD displays traffic in the area or SRCHNG.
If traffic is constantly showing within 100 feet vertically and less than 0.3
iNM, turn the transponder to standby and wait at least fifteen seconds. If that
traffic disappears from the Display, then turn the transponder on again. If the
traffic returns, then the equipment is displaying the host transponder. Check
the Transponder Coupler connections.
C. To insure proper antenna connection, verify TCAD shows targets of
opportunity above 100 feet and beyond 0.7 iNM in the ENRT or Unrestricted
Mode, and that the range (and angle if the test unit is a 9900B) displayed on
TCAD reasonably agrees with visual estimates.
NOTE: Reflections from hangar walls will cause jumpiness and inaccuracy of the
bearing display.
4.4.4 RAMP TEST, DISPLAY
A. Press the test buttons (DATA & ENRT) again.
B. When the Display shows "Testing Display", press the UP arrow and MUTE.
C. TCAD will then perform a 90-second CRC test of the Display. A horizontally
oriented number will count down as the test is conducted. The test will
conclude with the software version levels indicated.
4.4.5 RAMP TEST, ANTENNAS (Models 9900 and 9900A)
A. Continue to interrogate the host transponder, and conduct this test using the
Ramp Test set up per subparagraph 4.4.1.
B. Verify performance per subparagraph 4.4.3C.
C. Disconnect the bottom antenna from the Processor.
D. Verify performance per subparagraph 4.4.3C.
E. Reconnect bottom antenna. Verify traffic is displayed.
F. Disconnect the top antenna from the Processor.
NOTE: Some signal attenuation (range variation) may occur when using
the bottom antenna only.
G. Verify TCAD performance per subparagraph 4.4.3C.
H. Reconnect top antenna. Verify traffic is displayed per subparagraph 4.4.3C.
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