Icom IC-T7H Service Manual

5 - 1
SECTION 5 ADJUSTMENT PROCEDURES
5-1 PLL AND TRANSMITTER ADJUSTMENT
PLL LOCK
VOLTAGE
(VHF)
(UHF)
PLL
REFERENCE
FREQUENCY
OUTPUT
POWER
FM
DEVIATION
DTMF
DEVIATION
(USA-3,SEA
only)
TONE CALL
DEVIATION
(EUR, ITA
only)
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT LOCATION UNIT ADJUST
1
2
1
2
1
1
2
3
4
1
2
1
1
• Displayed frequency :
145.000 MHz
• Receiving
• Transmitting
• Displayed frequency :
440.000 MHz [USA-3]
430.000 MHz [Other]
• Receiving
• Transmitting
• Displayed frequency :
445.000 MHz [USA-3]
435.000 MHz [Other]
• Transmitting
• Displayed frequency :
145.000 MHz
• Output power: High
• Transmitting
• Output power: Low
• Transmitting
• Displayed frequency :
445.000 MHz [USA-3]
435.000 MHz [Other]
• Output power: High
• Transmitting
• Output power: Low
• Transmitting
• Displayed frequency :
145.000 MHz
• Connect an audio generator to
the [MIC] connector and set as:
1 kHz/95 mV
• Set the FM deviation meter as :
HPF : OFF
LPF : 20 kHz
De-emphasis : OFF
Detector : (P–P)/2
• Output power: High
• Transmitting
• Displayed frequency :
445.000 MHz [USA-3]
435.000 MHz [Other]
• Output power: High
• Transmitting
• Displayed frequency :
445.000 MHz [USA-3]
435.000 MHz [SEA]
• Push [D] key while transmitting
• Displayed frequency:
435.000 MHz
• Push [TONE] key while transmit-
ting
1F
Top
panel
Top
panel
Top
panel
Top
panel
Top
panel
Connect a digital
multimeter or an
oscilloscope to the
“VLV”.
Connect a digital
multimeter or an
oscilloscope to the
“ULV”.
Loosely couple a
frequnecy counter
to the antenna con-
nector.
Connect an RF
power meter to the
antenna connector.
Connect an FM
deviation meter to
the antenna con-
nector through an
attenuator.
Connect an FM
deviation meter to
the antenna con-
nector through an
attenuator.
Connect an FM
deviation meter to
the antenna con-
nector through an
attenuator.
1.3 V
0.9 V – 1.7 V
2.2 V
1.9 – 2.5 V
445.0000 MHz
[USA-3]
435.0000 MHz
[Other]
5.5 W
0.5 W
5.5 – 6.0 W
0.5 W
± 4.3 kHz
± 4.3 kHz
± 3.5 kHz
± 3.5 kHz
DUAL-
VCO
1F
2F
2F
LOGIC
LOGIC
L303
Verify
L301
Verify
C369
R302
R316
R304
R313
R308
R314
R147
R147

Icom IC-T7H Specifications

General

Brand	Icom
Model	IC-T7H
Category	Transceiver
Language	English