Icom IC-A25C Service Manual

4-4a
(Replacement page)
March 2019
ADJUSTMENT
ADJUSTMENT
ITEM
TRANSCEIVER'S
CONDITION
OPER ATION VALUE
NO. NAME
REFERENCE
FREQUENCY
1
000 REF
• Frequency: 136.975 MHz
• Transmitting
• Connect the RF power meter to the
antenna connector.
• Loosely couple the frequency
counter to the antenna connector.
136.975 MHz
(±100 Hz)
TX OUTPUT
POWER
1
013 BATT
PL
• Frequency: 118.000 MHz
• Transmitting
• Attach the fully charged battery
pack.
• Connect the RF power meter to the
antenna connector.
• No audio applied to [MIC].
1.8 W
(at 7.2 V)
2
014 BATT
PM
• Frequency: 127.500 MHz
• Transmitting
3
015 BATT
PH
• Frequency: 136.975 MHz
• Transmitting
TX OUTPUT
POWER
1
016 EXT PL
• Frequency: 118.000 MHz
• Transmitting
• Detach the battery pack.
• Connect the DC power supply to
[DC 11 V].
• While transmitting, adjust the power
supply voltage to 11.0 V.
• No audio applied to [MIC].
1.8 W
(at 11.0 V)
2
017 EXT PM
• Frequency: 127.500 MHz
• Transmitting
3
018 EXT PH
• Frequency: 136.975 MHz
• Transmitting
MODULATION
(at 7.2 V)
1
019 BATT
25MML
• Frequency: 118.000 MHz
• Transmitting
• Disconnect the DC power supply.
• Attach the fully charged battery
pack.
• Connect the modulation analyzer to
the antenna connector, through the
attenuator, and set it to:
HPF: OFF
LPF: 20 kHz
De-emphasis: OFF
Detector: (P−P)/2
• Connect the audio generator to
[MIC], and set it to:
Frequency: 1 kHz
Level: 200 mV rms
Waveform: Sine wave
90% (±2%)
2
020 BATT
25MMM
• Frequency: 127.500 MHz
• Transmitting
3
021 BATT
25MMH
• Frequency: 136.975 MHz
• Transmitting
4
022 BATT
8MML
• Frequency: 118.005 MHz
• Transmitting
USA, EXP:
80% (±2%)
EUR, AUS:
90% (±2%)
5
023 BATT
8MMM
• Frequency: 127.505 MHz
• Transmitting
6
024 BATT
MMH
• Frequency: 136.980 MHz
• Transmitting
7
031 BATT
25NML
• Frequency: 118.000 MHz
• Transmitting
Set the audio generator to:
Level: 20 mV rms
30% (±5%)
8
032 BATT
25NMM
• Frequency: 127.500 MHz
• Transmitting
9
033 BATT
25NMH
• Frequency: 136.975 MHz
• Transmitting
10
034 BATT
8NML
• Frequency: 118.005 MHz
• Transmitting
11
035 BATT
8NMM
• Frequency: 127.505 MHz
• Transmitting
12
036 BATT
8NMH
• Frequency: 136.980 MHz
• Transmitting
The underlined parts have been updated from the previous version of the addendum, or the original page.
4-2 FREQUENCY AND TRANSMIT ADJUSTMENTS
1. Select an adjustment item by pushing [ ▲ ]/[ ▼ ].
2. Set or modify the adjustment value as specified by rotating [DIAL], and then push [ENT].

Icom IC-A25C Specifications

General

Purpose	Aviation Service (Air Band)
Operating frequency	118.000 – 136.992 MHz
Display type	LCD
Display diagonal	2.3 \
Battery type	BP-288
Battery life (max)	10.5 h
Battery low indication	Yes
Number of batteries supported	1
Product color	Black
Operating temperature (T-T)	-10 - 60 °C
Number of batteries included	1 pc(s)
Antenna connector type	FA-B02AR

Weight and Dimensions

Depth	31.8 mm
Width	58.9 mm
Height	148.4 mm
Weight	384 g