Revision A
T-48 90 008 026
2-9
2.10
Initial Start-up Procedure
When utilizing the T-48 Test Set, always begin with a fully charged battery or AC power connected. The
following displays are shown without a transponder being tested.
1. Press the
INTERROGATE
or
TEST
button to activate the Test Set. The following display
will appear briefly, denoting the current software version of the T-48 Test Set:
2. The T-48 will begin searching for a transponder to test. If the transponder is not connected or
powered up, the following display will be shown. The “
Rotating Bar”
in the upper right of
the display signifies the Test Set searching to acquire a RF signal.
3. Hold the
LIGHTS/OFF
switch in the “UP” position to verify that the backlighting for the
display is operating. Once the operator releases the switch, the backlighting extinguishes to
conserve battery power.
4. Press “DOWN” and release the
LIGHTS/OFF
switch to turn power “OFF” to the Test Set.
2.11 Transponder
Test
Sequence
The T-48 is capable of testing ATCRBS Mode A, Mode C, and Mode S transponders. The operator may
select an Automatic sequence of tests ending in the Power, Receiver Sensitivity, and Frequency display or
manually select the tests one at a time. Figure 2-6 lists the sequence of tests available in the Auto and
Manual sequence of tests.
The Test Set will determine, upon receiving the transponder RF signal, the appropriate sequence. If the
transponder is Mode S equipped, the T-48 will automatically select the Mode S menu. If the transponder is
only Mode A/C capable, the T-48 will prompt the Mode 3A/C transponder tests.
NOTE
TEL INSTRUMENT
T-48 REV.X.XX
XPDR TESTING ... /
NO REPLY
Any displays illustrated were the actual results from a calibrated Transponder. The
results may be typical of tests performed, but operators must utilize the literature
provided by their transponder manufacturer or FAA guidelines when testing their
transponder. The results displayed throughout this manual are for
ILLUSTRATION
PURPOSES ONLY
. All test results and displays were conducted with a TAP-141
Direct Connect Coupler to ensure accuracy.
