Filter
Top Products
DC503A
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P1024
P1012
P1010
(rF
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(OUr)
(tN)
H:N
Adrustment
Procedure
-
4g4A/4g4Ap
Servlce
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Figure
5-27. Opton
42
adiustment
test equipment setup.
c.
set the 7L14 Time/Div
to Manual,
and
adjust
the
crt
beam
(dot)
to
center
screen.
d. The DC503A
readout
shoutd
indicate
approxi-
mately
110.000MH2.
Set Level
as nec€ssary,
and set
the 7L14
Center Frequency
for an
indication
of
110.0
MHz.
e.
set the 7L14
Time/Div
to
catibrated
display.
f. Adjust
C1016,
C1020
and
C1024
for
maximum
amplitude,
symmetry
and
bandpass
(3
dB
and
6
dB
points).
(1)
Adjust
the bandwidth
symmetry +0.5
divisions
(r1
MHz)
at
th€
3 dB and
6 dB
points.
(2}
Check
that
bandwidth
at
the 3
dB
point
is
7.5
MHz, *1.5
MHz.
(3)
Check
that
3 dB and
6
dB
points
are
equidistant
from center
screen
within
0.5
division.
(4)
Check
that
any
ripple
present
on
the waveform
is
(0.2
div
(0.4
dB).
A slight change
in
display
may
be
observed
when
the cover is
reinstalled
on
the
module.
S.
Check
the Coupled
Fonuard
Gain
(tF
OUT
port
P1O24l.
(1)
Set
the
7L14 Spectrum
Analyzer Reference
Level
to
0 dBm.
(2)
Check
that the
display
on
the
7L14 is
between 4
and 7
divisions in amplitude
(-5
dBm,
i3
dBm).
h.
Check the Input Compression.
(1)
Increase
the
TR502 Output
Level and
REFER-
ENCE
LEVEL setting
in 1
dB increments until
the
amplitude displayed by the
7L14
decreases by
0.5
division
(1
dB
compression).
(2)
Check
that the
signal
displayed on the
7L14 indi-
cates
)0
dBm.
i.
Check Forward
Gain
(1)
Return
the
TR502 Output Level to
-25
and
remove the
connection to
the
modulo ]F OUT.
(2)
Connect
a
50o
termination to
the
lF OUT con-
nector, P1024.
(3)
Connect
the OUT
(P1012)
connector to the
7L14
RF
Input with a
50o
cable.
(4)
Adjust
the
7L14
Reference
Level
until the
displayed
signal is near
full screen
(8
divisions).
(5)
Check
that the
signal
displayed
on the
7L14 indi-
cates
-20
dBm
to
-23
dBm
(-21.5
dBm
*1.5 dBrn).
5-30