Operation,
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RGS-2000NG TCAS Test Set Operation Manual
139187 / Rev. 500
Page 198
Subject to Export Control. See Cover Page for details.
September 2021
3.6.13.3.4
UAT Sweep Mode
Sweep mode is a combination of fixed and swept messages. Fixed messages are transmitted each
second at fixed time slots. If Sweep mode is enabled, messages defined between 200ms and 210ms
(Swept Messages) are moved to a different time slot each second. The time slot spacing is determined
by the Sweep Step value. The sweep function may be used to fulfill the test Verification of Capacity for
Successful Message Reception defined in DO-282.
1The MSO region that is going to be swept is the messages defin ed from MSO 776-815 (200 - 210
ms). The messages defined in t he first 10ms of this range will be swept across the first 10ms of
each of the following ranges. At a 100ms step, in the first second the messages will be transmitted
between 200ms to 210ms. In the next second the messages will be moved to 300ms to 310ms.
2 T he messages will move by the Sweep Step defined so no message s can be defined for the first 10ms
of each Sweep step range or time slot. Messages defined outside the first 10ms of each Sweep Step
will be transmitted every second.
EXAMPLES:
IF YOU PLAN ON A 100MS STEP THEN YOU MUST LEAVE SPACE FOR THE SWEPT
MESSAGES IN THE 300MS - 310MS, 400MS - 410MS, ETC. RANGES.
IF YOU PLAN TO SWEEP AT 50MS STEP T HE N Y O U M US T L EAV E SP A CE F O R TH E
SWEPT MESSAGES IN THE 250MS - 260MS, 300MS - 310MS, ETC. RANGES.
NOTE:
THE RELATIONSHIP OF TIME FROM THE START OF EACH FRAME TO MSO ST EP IS
CAL CULAT ED WITH THE EQUATION ( TIME = 6MS + 250US*MSO STEP).
3 A m essage either ground uplink or airborne must be present bef ore MSO 776 for the sweep function
t o wo r k .
4 T he Sweep Interval determines the end of t he sweep range. When t he Sweep Interval is reached, the
swept transmissions start over at the beginning (200ms to 210ms ) position.
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