Icom IC-A25C Service Manual

4-3
4-2 FREqUENCY AND TRANSMIT ADJUSTMENTS
Select an adjustment item by pushing [1. Y]/[Z].
Set or modify the adjustment value as specified by rotating [DIAL], and then push [ENT].2.
ADJUSTMENT
ADJUSTMENT
ITEM
TRANSCEIVER'S CONDITION OPERATION 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].•
(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.
Connect the audio generator to •
[MIC], and set as shown below:
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•
MODULATION
(at 11.0 V)
1
025 EXT
25MML
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.
Connect the modulation analyzer to •
the antenna connector, through the
attenuator.
Connect the audio generator to •
[MIC], and set as shown below:
Frequency: 1 kHz
Level: 200 mV rms
Waveform: Sine wave
USA, EXP:
87% (±2%)
EUR, AUS:
90% (±2%)
2
026 EXT
25MMM
Frequency: 127.500 MHz•
Transmitting•
3
027 EXT
25MMH
Frequency: 136.975 MHz•
Transmitting•
4
028 EXT
8MML
Frequency: 118.005 MHz•
Transmitting•
USA, EXP:
80% (±2%)
EUR, AUS:
90% (±2%)
5
029 EXT
8MMM
Frequency: 127.505 MHz•
Transmitting•
6
030 EXT
8MMH
Frequency: 136.980 MHz•
Transmitting•
7
037 EXT
25NML
Frequency: 118.000 MHz•
Transmitting•
Set the audio generator to:
Level: 20 mV rms
30% (±5%)
8
038 EXT
25NMM
Frequency: 127.500 MHz•
Transmitting•
9
039 EXT
25NMH
Frequency: 136.975 MHz•
Transmitting•
10
040 EXT
8NML
Frequency: 118.005 MHz•
Transmitting•
11
041 EXT
8NMM
Frequency: 127.505 MHz•
Transmitting•
12
042 EXT
8NMH
Frequency: 136.980 MHz•
Transmitting•

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