Model
890l.B
Performance
Test
10b
Performance
Tests
CARRIER NOISE FILTER
-
OPTION
037
Description
Option
037
Performance Verification
This
test
is
to
be
performed
on
Option
030
instnune
nts
contajningOption037 asone ofthe alternate
channel
filters.
In
this
test
an
HP
86628
(or
level
acamq
equivalent altemative)
is
used
to
simulate
both
an
in-1
and
adjacent
channel
signal.
The
signal
generator
is
first
tuned
in-channel
60
that
the
reference
can
be
set
for
the
adjacent
channel
power
measurement.
The
signal
generator
is
then
tuned
to
the
adjacent
channel
and
the
LO
shifted
to
measure
the
signal
generator.
The
output
level of
the
signal
generator
is
varied
to
exercise
different
combinations of
IF
gain
Testing
is
done
usinganHP8660asanexternalLOsource.
Equipment
SOURCE
Signal
Generator
..................................................................
HP
8662A
EXTERNAL
LO
Signal
Generator..
...........................................................
HP
8660
Procedure
Initial Setup
9.
Set
the SOURCE
signal
generator
to
800
MHz
CW
at
0
dBm
and
corn
it
to
the
Measuring
Receiver’s
RF
hput.
Set
the
EXTERNAL
LO
signal
generator
to
800.455
MHZ
at
0
dBm
and
connect
it
to the Measuring Receiver’s
LO
INPUT
port
on
the rear panel.
Allow
all
equipment
30 minute warmup
minimum.
Filter Test
of
Option
030
Combination Which Includes Option
037
10.
On
the Measuring Receiver, key
in
the
following:
a.
41.0SP (Perfonn instrument
PRESET)
b.
1200
MHZ
(Manual
tune
LO
to
eliminate internal
LO
interference)
c.
23.1SP (Select external
LO)
d. 24.0SP (Initialize Option 030)
e.
24.5SP (Select Option 037 filter, displays
IF
Reference level value)
f.
24.6SP (Displays Option 037 filter ratio level value)
11.
Offset EXTERNAL
LO
signal
generator
UP
10
kHz
(800.465
MHz).
12.
Offset
SOURCE
signal generator
UP
10
kHz
(800.010
MHZ).
13. Change signal generator power level
to
-75
dBm.
Read the ratio displayed on Measuring
LEVEL
RATIO -75dB (k1.5d-B)
14. Change
signal
generator power level
to
-65
dBm.
Read the
ratio
displayed on Measuring
Receiver.
If
the display is slightly unstable due
to
noise, then average the readings.
Receiver.
LEVEL RATIO -65dB (3tl.5dB)
15.
Change the signal generator power level
to
-45
dBm.
Read the ratio displayed
on
the
LEVEL RATIO
-45dB
(il.5dB)
Measuring Receiver.
reu.01
OCT92
Performance Test
lob
4-38.1
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