Marconi Instruments 2955 - Page 50

OPERATION
DUPLEX TESTING
fig.
3-
10 Duplex
operation controls
and
connectors
(T)
DUPLEX
key.
Connects the
RF
generator
to
RF
DN70UT
socket
(
4
)
or
©.
the
modulation
meter
and
the cower
meter to socket (T) and
the
distortion meter
to
socket
©•
(
2
^
dt
INCREMENT keys.
Only
operable when the RF generator
step \alue
has pre-
viously
been set
in
the RX miOde.
0
SELECT key.
Used
to
select
one
port or two port
operation.
(0
IN/OUT
BNC
socket
Connects the
RF
generator
to
the
receiver
input
for
two
port
operation.'
Impedance 50 Q,
0
)
RF
IN/OUT N
socket
Connects
the input from the
transmitter
for
two pon
opera-
tion or simultaneous
input
from
the transmitter
and output
from
the
RF
generator
for
one
port operation.
A
temmerature sensor detects excessive
power.
Impedance
50
O.
0
AF GEN
OUTPUT
socket.
BNC cutout for
m.odulatinc
the
transmitter
in
deviation
measurements.
0)
DISTN ON-OFF
key.
Causes
the .AF generator to
modulate the RF
generator
with
a
1 kHz
tone.
0
AF
INPUT
socket.
BNC
socket
for
the
AF
input for
distortion or
SINAD
measure-
ments.
3-25
46881 -622N
Apr.
88