Icom IC-R8500 Service Manual page 22

RECEIVER ADJUSTMENT
(CONTINUED)
ADJUSTMENT ADJUSTMENT
CONDITIONS
MEASUREMENT
VALUE
ADJUSTMENT
POINT
UNIT LOCATION
UNIT
ADJUST
HF TOTAL
GAIN
1
• Displayed
Iraq.
:
14.09650
MHz
«
Mode
;
USB
•
Connect an
SSG
to
the
antenna connec-
tor for
0.
1
-30
MHz
(50
Q
ANT) and
set
as:
Frequency
:
14,10000
MHz
Level
:
1
mV* (-47 dBm)
Modulation
:
OFF
«
Receiving
Rear
panel
Connect an
AC
milli-
voltmeter to
the
[EXT SPJ
jack
with
an
8
0
load.
1.5
kHz audio
Front
panel
[DIAL]
1.0V(0dB) (AF GAIN]
2 • Set an
SSG
level as;
OFF
100
mV
(-20
dB)
MAIN R139
v;uHF
TOTAL
GAIN
1
Displayed
freq.
:
173.0185
MHz
«
Mode
:
USB
Connect an
SSG
to the
antenna connec-
tor for
30-2000
MHz
and
set as:
Frequency
;
173.02000
MHz
Level
:
1
mV*
(
- 47
dBm)
Modulation
:
OFF
Receiving
Rear
panel
Connect an
AC
milli-
voltmeter
to
the
[EXT SP)
jack
with
an
8
0
toad.
1.5
kHz
audio
Front
panel
[DIAL]
1.0
V
(OdB) [AF GAIN]
2
•
Set an
SSG
level as:
OFF
100
mV
(-20
dB)
MAIN R504
NOISE
1
Displayed
freq.
:
173.00000
MHz
Rear Connect an
osdilo-
Minimum
noise
MAIN
LIB, L21
BLANKER Mode JS8
panel scope
to the
[EXT SP)
level
»
Connect an
SSG
to
the
antenna connec-
jack with
an 8
Q
load.
tor for
30 -2000
MHz
and
set as:
Level 10 uV*
(-87 dBm)
and
apply following signal
to
the anten-
na
connector.
100 msec.
L
1
m
sec.
• INB]
;
ON
•
Receiving
CENTER
1
Displayed
freq.
:
173.02000
MHztJf
MAIN
Connect an
osdilo-
At the
point
where
MAIN
R233
STOP
Mode
:
FM
scope
to
CP3.
the voltage
just
be-
«
Connect an
SSG
to the
antenna connec- comes
0
V
for
tor
for
30-2000
MHz
and
set as:
equidistant values
Frequency
173.02000
MHz
both
above and
Level
:32pV*(-77dBm)
below the
dis-
Modulation
:
OFF
played frequency
•
Receiving
in
1
00 Hz
tuning
steps.
AM CENTER
1
• Displayed
freq.
:
173.01670
MHz
and
MAIN
Connect an
osdilo-
At the
point
where MAIN R447
173.01B90
MHz
scope
to
CP3. the
voltage
jusi
*
Mode
:
AM
becomes 0 V
at
•
Connect an
SSG
to
the antenna- 173.01870
MHz
connector
tor
30-
2000
MHz
and
set
as;
and 5
V
at
Frequency
173.02000
MHz
173.01890 MHz.
Level
:32uV(-77dBm)
Modulation
:
OFF
• Receiving
'*Thi&
output
level of
a standard
signal
generator (SSG)
is
indicated as
SSG's open
circuit.
5-5