Revision A
T-48 90 008 026
2-17
MODE S COMM A Altitude test initialized. The Test Set will transmit
a COMM A/B, ABCD transmission utilizing the UF=4/RR:18 format.
This will test a transponders communication and data-link capabilities.
The transponder will reply in the DF=20 format. Aircraft address in
Hexadecimal, aircraft altitude, and the receiver efficiency will be
displayed.
TEST
button pressed to advance to next test.
Undesired Replies test initialized. The Test Set will make randomly
addressed interrogations. Only the correctly addressed interrogation
will be accepted.
If the transponder replies to any of the random addresses, an error
message will be displayed. “NO REPLIES” indicates the transponder
did not reply and has passed the test.
TEST
button pressed to advance to next test.
The Test Set will transmit no interrogations but receives and processes
DF=11 and extended DF=17 replies. After detection of the replies is
received, two alternating pages will be shown displaying the time
interval of received replies.
DF=11 Acquisition
The detection time of each DF=11 and/or DF=17 message will be
displayed. If the time interval is between 0.8-1.2 sec. - “PASS” is
displayed. If the time interval falls in the 1.6-2.4 sec. range – “DIV”
(Diversity) is also displayed. The aircraft address is also shown.
DF=17 Extended Squitter
If a DF=11 or DF=17 message is not received- “NOT DETECTED”
will be displayed.
If only one message of either DF=11 or DF=17 is received in the 5.1
second measuring period, “FAIL” will be displayed and no time will be
shown.
MODE S COMM ALTITUDE
TESTING . . .
MODE S COMM YXXXXX
10,000FT 100% REPLY
UNDESIRED REPLIES
TESTING . . .
UNDESIRED REPLIES
NO REPLIES
SQUITTER
TESTING . . .
ACQ:PASS DIV 1021 MS
ADD: AXXXXX II:0
EXT: PASS DIV 520 MS
ADD: AXXXXX
ACQ: NOT DETECTED
EXT: FAIL
ADD: AXXXXX
