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Side lobe
SLS
Si
de 1
obe
suppression
S
LS
dead
ti
me
SPI-pulse
Special
position
identification
pulse
Squawk
Squawk
alfa
Squawk
altimeter
or
Squawk alta/charlie
Squawk
ident
Squawk standby
Stop
squawk
SSR
Seconrlilry Surveillance Radar
1.2
Application
Unwanted
radiation
in the pattern
of
the
SSR
grou
nd
direction
al
antenna
Prevents triggering
by
the
side-lobe radiation
emitted
by the
SSR
antenna
The side lobe suppression (SLS) resu\ts in the trans-
ponder
also being blocked
for
a certain time,
this
SLS dead ti me
is
25
± 1
OMs
Pulse
locating 4.35Ms
following
~he
secondary frame
pulse
of
a transponder
re
ply,
actuated by the pi 1
ot
on ground request
by
briefly
pressing the 1
DENT
button
and causing a special
identification
of
target
on the radar screen
(see
also 1
DENT)
Slang expression
for
secondary radar reply
Request made
to
pilot
to
initiate
mode A (mode
switch
in
position
ON)
Request made
to
pilot
to
initiate
mode C (mode
switch
in
position
AL
T)
Request Made
to
pilot
to
press
IDENT
button
Request made
to
pilot
to
switch the transponder
into
standby (mode switch in position
SBY)
Used
to
i den ti
fy
transponder equ ipped
ai
rcratt
by
transmitting
signais and receiving coded replies.
SSR
is
scan synchronized
with
PSR
(Primary
Surveillance
Radar)
The
transponder
ATC
2000
is
the airborne component
of
the
Air
Traffic
Control Radio Beacon system
operating on the principle
of
the secondary radar system (SSR) and
permitting
location,
identification
and
tracking
of
aircraft by the corresponding ground stations
tor
the
purpose
of
Air
Traffic
Control.
At
the
same tirne,
ATC
personnel
can
receive special informations via
the
transponder.
1.3
Abridged Description
The
transponder ATC
2000
is
a single block
unit
provided
for
installation
in the
instrument
panel
or
control
panel
of
an
aircraft, its dimensions being
in
keeping
with
ARINC
standard
for
control
units,
and secured
by
rnecms
of
four
DZUS
fd~Lt::ller5.
Ali
controls
are
located on the
front
panel, the rear panel
of
the
transponder mounts the connectors
for
connecting the aircraft
wiring
and
an
encoding altimeter
as
weil
as
the
antenna socket_
The
electronics
of
the
unit
are made
up
of
the
encoder/power
supply
module,
the
receiver/decoder module
and the transmitting tube. The receiver/decoder module
can
be
folded
out
to
facilitate servicing, thus
permitting
easy
access
to
ali transponder cornponents. The
transmitting
tube
is
screwed on one side
to
the
chassis frame.
The
transponder
is
ready
for
operation roughly
60s
after switching
on,
this
ti me being required
to
warm
up
and stabilize the
transmitting
tube.
1-3
The document reference is online, please check the correspondence between the online documentation and the printed version.
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