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

Icom IC-T7A Specifications

General

Brand	Icom
Model	IC-T7A
Category	Transceiver
Language	English