Receiver Adjustment - Icom IC-T7A Service Manual

5-2
RECEIVER
ADJUSTMENT
ADJUSTMENT ADJUSTMENT
CONDITIONS
MEASUREMENT
VALUE
ADJUSTMENT
UNIT
LOCATION
UNIT
ADJUST
VHF
SENSITIVITY
1
• Displayed frequency: 145.000
MHz
•
Connect a
SSG
to
the
antenna
connector
and
set as:
Level
:
1.0
mV*
(
-47
dBm)
Mod.
:
1
kHz (±3.5 kHz
Dev.)
•
Receiving
2F
Connect a
digital
multimeter or
oscilloscope
to
the
check
point
"S".
Maximum
level
2F
Adjust
in
sequence
L53, L54,
L55
UHF
SENSITIVITY
• Displayed frequency:
445.000
MHz
(USA
version)
435.000
MHz
(Other versions)
•
Connect a
SSG
to
the
antenna connector
and
set as:
Level
:
1
.0
mV*
(
-47
dBm)
Mod.
:OFF
•
Receiving
2F
Connect a
digital
multimeter
or
oscilloscope
to the
CPI.
1.0
V
2F
LI
02
SQUELCH
LEVEL
1
• Displayed frequency:
any
•
Connect an
SSG
to
the antenna
connector
and
set as:
Level
:
0.11
pV*(
-126dBm)
Mod.
:
1
kHz (±3.5 kHz
Dev.)
• Pre-set the
R504
to
maximum CW.
• Receiving
Spea-
ker
At the
point
where
the
AF
signal
just
disappears.
2F R504
S-METER 1
• Displayed frequency:
445.000
MHz
(USA
version)
435.000
MHz
(Other versions)
« Connect an
SSG
to the
antenna
connector
and
set
as:
Level
:
0.5
pV*
(-113 dBm)
Mod.
:
1
kHz (±3.5 kHz
Dev.)
•
Connect a
terminator
to
the
[EXT SP]
jack.
• Receiving
Front
panel
Push and
hold
the [CALL]
key.
2
•
Set an
SSG
output
level for
the S-meter
to
S3
(4 dots).
SSG
Output
level
0.32
to
0.79
pV
(
-117
to
-109 dBm)
Verify
*This output
level of
a standard
signal
generator (SSG)
is
indicated
as
the
SSQ's open
circuit.
•
2F UNIT
5-3