ab out
+60
dBm,
making
the
signal
lev
els
at
the
a1
mixer
and
the
b1
mixer
o
v
er
+30
dBm.
In
order
to
a
v
oid
damage:
The
A
TTENUA
TOR
POR
T:
1
attenuator
m
ust
b e
set
to
30
dB
in
order
to
reduce
the
a1
and
b1
signal
lev
els
to
b elow
010
dBm;
On
the
transmission
return
side,
the
amplier
output
is
ab out
60
dBm,
making
it
necessary
to
add
20
dB
of
loss
b et
w
een
it
and
P
ort
2
in
order
to
reduce
the
signal
lev
el
inciden
t
at
P
ort
2
to
less
than
+43
dBm;
The
A
TTENUA
TOR
POR
T:
2
step
attenuator
m
ust
b e
set
to
30
dB
in
order
to
protect
the
b2
mixer;
and
The
rev
erse
p ole
of
the
forward/reverse
switch
m
ust
b e
protected
b
y
installing
an
attenuator
or
isolator
in
the
rear
panel
POR
T
2
links
to
reduce
the
signal
lev
el
at
the
rev
erse
p ole
of
the
switch
to
b elow
+20
dBm.
The
coupler
is
used
in
the
transmission
return
signal
path
b ecause
it
pro
vides
the
necessary
loss
and
will
probably
pro
vide
a
more
stable
signal
path
than
a
high
p o
w
er
attenuator
that
w
ould
otherwise
b e
required.
A
high
p o
w
er
termination
is
required
to
terminate
the
through
arm
of
the
coupler.
Figure
3-26.
Measuring
an
Amplifier
with
High
Input
Lev
els
Using
the
P
ort
1
and
P
ort
2
A
ttenuators
The
P
ort
1
and
P
ort
2
step
attenuators
are
used
to
adjust
the
signal
lev
el
in
to
the
mixers
and
th
us
protect
the
mixers
from
excessiv
ely
high
signal
lev
els.
Note
that
the
attenuators
do
not
c
hange
the
P
ort
1
or
P
ort
2
signal
lev
els.
3-32
Operation
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