3-2
3.3
Operating 1 nstructions
Do
not
switch On or switch
OFF
the transponder
until
the
engines have been started
or
stopped respectively
to
avoid
damage
to
the
transponder due to current
surges.
3.3.1
Built-in TEST
1. Position mode switch
from
OFF to SBY. Operate the transponder approx.
60s
in the
SBY
position
since
transmitting
tube
must warm uo
and
stabilize
prior
to
operation.
lt
is,
however, possible
to
skip
the
SBY position
without
danger for the
transmitter
tube, since
the
latter
is
safeguarded
by
a
cavity
protection
circuit
which
also requirs approx.
60s
to
warm up.
2.
Turn
mode switch
as
far
as
it
will
go
to
TEST (key position) in which the transponder simulates
interrogation,
prompting
a reply.
The
reply indication
is
given
by
the REPL Y lamp
illuminating.
3.3.2
Mode A Operation
1.
Activate
the
transponder on ATC request
only.
T o
en
sure
instant
readiness, position the mode switch
to
SBY (standby)
during
the flight.
2.
Set the code requested
by
ATC
using the
four
coding switches. Set
two-digit
code numbers in the
first
two
windows
of
the
readout.
•
Only
operate the coding switches in the SBY (standby)
position.
•
Do
not
operate the -;:ransponder
on
the code numbers 76
..
or
77
..
, since these are reserved
for
speci fic pu rposes, e.g. emergencies.
•
Do
not
run the transponder
on
the code nurnber
0000
since
this
results
in
only the frame pulses being
transmitted
not
permitting
the
ground station
to
identify
the
aircraft.
3.
Switch
the
mode switch ON on ATC request, the tnmspondcr
thcn
rcsponding
to
mode 1\ interrogation
with
the dialed code,
as
indîcated by the REPL Y larnp coming
on.
4.
Only
press
the 1
DENT
button
briefly
wh
en
requested
by
ATC,
causîng a special
identification
pulse
(SP
1
pulse) being transmitted, perrniltiri\J irlsldrll
identification
of
the
aircraft
on the
ATC
radar system.
3.3.3 Mode A and Mode C Operation
1. Position mode switch
to
AL
Ton
ATC request
only
(as
long
as
an encoding altimeter
is
connected
to
the
transpnnrlP.r)
ThP.
lrimsponder then responds
with
the
dia led code, causîng
REPL
Y larnp
to
light
up and
additionally
transmits the height
of
the
aircraft
to
ATC.
2.
Press
the
IDENT
button
on
ATC
request
only,
thus
transrnitting
a special
identification
pulse (SPI)
cnobling
1\
TC
personel
to
identify
immediately the
aircraft
on
the
radar screen.
09/80
The document reference is online, please check the correspondence between the online documentation and the printed version.
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