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Section
Il
INSTALLATION
2.1
General
Installation
of
the
transponder ATC 2000 depends on the
type
of
aircraft involved
and
its equipment,
thus the
information
in this section
can
only
be
of
general
nature.
2.2 Checking prior to
Installation
2.2.1 General
Prior
to
installing the transponder
into
the aircraft a check must
be
made
to
establish whether the
unit
has
been
damaged in transit.
2.2.2
Checking Procedure
Connect the transponder
to
the test setup
as
shown in Fig.
2-1
and carry
out
the following tests in the
given sequence. lnstead
of
the transponder test
set
SQUAWK/NAUT
1
an
equivalent test set
or
a ramp test
set
can
be
used.
2.2.3 Checking
Receiver
Sensitivity
1.
Set
SQUAWK/NAUT
1
to
mode A on
an
interrogation recurrence frequency
of
400Hz.
Note that the
amplitude
of
pulse
P2
is
~-
9 dB
of
pulse
P1.
2.
Note that
pulses
P1
and
P3
have
equal amplitudes. Set the
RF
input
leve!
to
72 dB and observe
that the transponder replies
to
at least 90%
of
the interrogations.
3.
Set
SQUAWI</NAUT
1
lu
rrruu!:J
C
<:mu
refJ!:Jot
le5t.
2.2.4
Checking
Side
Lobe
Suppression
(SLS)
1.
Set
SQUAWK/NAUT
1
to
mode A
on
an
interrogation recurrence frequency
of
400Hz.
?.
:;et
rrJisP.s
P1
and
P2
to
same
amplitude.
3.
Alter
the HF
in
put
leve!
from 69 dBm to - 24 dBm, whereby the transponder must
re
ply
to
not
more than
1%
of
the interrogation pulses.
22.5
Checking
Reply
Pulses
1.
Set
SOUAWK/NAUT
1
to
mode A at
an
interrogation recurrence frequency
ot
400 Hz. Set pulses
P1
and
P3
to
-
60
dBm.
2. Transmit frequency must
be
1090
MHz±
3 MHz.
3. The
output
power shall
be~
250 W
of
the antenna terminal.
If
RG
58 C/U
is
used
as
indicated
in
the test setup fig.
2-1
, the cable attenuation of a pp. 1 dB wi
Il
redu ce
the
output
power by a pp. 50 Watts.
2-1
The document reference is online, please check the correspondence between the online documentation and the printed version.
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