Section 5 Adjustment Procedures; Pll And Transmitter Adjustment - Icom IC-T7A Service Manual

SECTION
5
ADJUSTMENT PROCEDURES
5-1
PLL
AND TRANSMITTER ADJUSTMENTS
ADJUSTMENT ADJUSTMENT CONDITIONS
MEASUREMENT
VALUE
ADJUSTMENT
UNIT
LOCATION
UNIT
ADJUST
PLL
LOCK
VOLTAGE
m
•
Displayed frequency: 145.000
MHz
• Receiving
IF Connect a
digital
multimeter or
an
oscilloscope
to
the "VLV".
1.1
V
DUAL
-VCO
L303
2
•
Transmitting 1.3
V
+0.4V
Verify
3 •
Displayed frequency:
440.000
MHz
(USA
version)
430.000
MHz
(Other versions)
•
Receiving
Connect
a
digital
multimeter or
an
oscilloscope
to
the "ULV".
2.1
V
(USA
version)
1.8
V
(Other versions)
L301
• Transmitting
2.1
V
±0.2
V
(USA
version)
1.8
V
±0.2
V
(Other versions)
Verify
PLL
REFERENCE
FREQUENCY
1
• Dispiayed frequency:
450.000
MHz
(USA
version)
440.000
MHz
(Other versions)
• Transmitting
Top
panel
Loosely couple a
frequency counter
to
the
antenna
connector.
450.000
MHz
(USA
version)
440.000
MHz
(Other versions)
IF C369
OUTPUT
POWER
1
•
Displayed frequency: 145.000
MHz
• Output
power
High
• Transmitting
Top
panel
Connect an
RF
power
meter
to
the antenna
connector.
4.0
W
2F R302
2 • Displayed frequency:
445.000
MHz
(USA
version)
435.000
MHz
(Other versions)
• Output power: High
• Transmitting
3.0
W
R304
FM
DEVIATION
• Displayed frequency: 145.000
MHz
•
Connect an audio generator
to
the [MIC]
connector and
set as:
1
kHz/95
mV
• Set an
FM
deviation
meter
as:
HPF
:
OFF
LPF
:
20 kHz
De-emphasis
:
OFF
Detector
:
(P
-
P)/2
• Output power: High
• Transmitting
Top
panel
Connect an
FM
deviation
meter
to
the
antenna
connector through an
attenuator.
±4.6 kHz 2F R308
2 • Displayed frequency:
445.000
MHz
(USA
version)
435.000
MHz
(Other versions)
• Output power: High
• Transmitting
±4.6 kHz
R314
DTMF
DEVIATION
(IC-T7A
only)
1
• Displayed frequency:
445.000
MHz
(USA
version)
435.000
MHz
(Other versions)
•
Push
[D]
key
while
transmitting
Top
panel
Connect an
FM
deviation
meter
to the
antenna
connector through an
attenuator.
±3.5 kHz LOGIC
R147
TONE
CALL
DEVIATION
(IC-T7E
only)
1
•
Displayed frequency: 435.000
MHz
•
Push [TONE]
key
while transmitting
Top
panel
Connect an
FM
deviation
meter
to
the
antenna
connector through an
attenuator.
±3.5 kHz LOGIC
R147