Marconi Instruments 2955 - Page 53

OPERATION
TONES DECODING
AND
ENCODING
Hg.
3-11
Tones
'operation
controls
and
connectors
(T)
TONES
key.
Causes
the
TONES
ST.ANHDARD
MENU
to be
displayed.
In
duplex
operation,
causes
the tones
receiver test
mode
to be
entered.
(J)
RX key.
Connects the RF generator output to RF
IN/OUT
sockets
(?)
and
(jT)
and
writes
RECEIVER
TEST on the screen.
(?)
MODE
keys.
These
are used
as
soft keys
to
select
programmed
functions
from
menus
which
are
shown
alonside
on
the screen.
(
4
)
TX key.
Connects
the
modulation
meter to
sockets
(^
and
(?)
and
writes
TRANS-
h^UTi
TEST
on the
screen.
(^
DUPLEX
key.
Connects the RF senerator
and
modulation
meter to
sockets
(^
and
©.
(^
DATA
keypad.
For data
entrv
using
numerals
0
to 9.
decimal
point
and
minus
sign.
0
FREQ/LEVEL
keys.
For defining
units
for
frequency
or
level.
Terminates
the
data
entry.
(?)
DELETE
key.
Deletes
a
preceding
digit,
decimal
point or
minus
sign
entered
on(0.
(0
RF IN/OUT
BNC socket
For
the RF
generator
output
for
two-pon
duplex
opera-
tion.
Impedance
50
H.
46831
-622N
Apr,
8S
3-29