Filter
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Adjurtment
Procedure
-
494A1494Ap
SeMce
Vot.
I
e.
Disconnect
p693
(Figure
5-17)
and
activate
MtN
NOISE.
Apply
a 10
MH4
-25
dBm signat,
from
the sig-
nal
generator,
through
a
bnc-to-sealsctro
adapter
to
J693:
Set
the
genorator
frequency
to
peak
the
signal
amplitude.
(Signal
amplitude
should
be
between
3.5
and
6.5
divisions.
tf signal
amptitude
is not
within
these
limits
it
indicates
a
gain
problem
in
the Variable
Resolu-
tion
module.)
f.
lf
the signal
amplitude
is over
5
divisions,
adjust
the
Post
VR
Gain R1030
(Figure
5-15) for
a
5
diviiion
signal
amplitude.
g.
Reset
the front
panel
AMPL
CAL for
a 7
division
signal.
h.
Switch
MIN
NOISE
off,
decrease
the
g€nerator
output
to
-35
dBm,
leave
the
REF
LEVEL
at
-20
dBm,
and
adjust
the
10dB
Gain
R303S,
on
the
10dB
Gain
board
(Figure
5-17)
so
the signal
amptitude
is 7
divi-
sions.
i.
Change
the
generator
output
to
-4S
dBm,
the
REF
LEVEL
to
-40
dBm,
and adjust
the
20 dB
Gain
R2023
on
the
20
dB Gain
Step board
(Figure
5-17) for a
7
division
signal amplitude.
j.
change
the
generator
output
to
-65
dBm, the
REF
LEVEL
to
-60dBm,
and
adjust
the
t0dB
Gain
R2060
on
the 20
dB Gain
Step board
(Figure
5-1Tl tor a
7 division
signal
amplitude.
k.
set
the REF
LEVEL
to
-30
dBm
and
the
genera-
tor
output
to
-35
dBm.
Check
lor a 7
division
signal
amplitude.
Repeat
this check
for
-45,
-55,
and
-65
dBm
input levels.
Note
that
each maintains
the Z
division
signal
to verify
that the
gain
of
the Variable
Resolution
gain
stages
are correct. Readjust
gain
il
necessary.
l.
Remove
the 10
MHz
signal
to J680
and
reconnect
P680.
The final
band
level
adjustments
ar€
described
after
calibrating
the Preselector
Tracking
and checking
flatness.
The mean level
for each
band is set
to th€
level
of
Band 1.
m,
Remove
the
extender
boards
and
re-install
the
Variable
Resolution
module
in
the Spectrum Analyzer.
n.
Press <Blue-SHIFT>
CAL
to
rerun a calibration
routine
and re-establish
processor
correction
factors.
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5-19