Icom IC-A25N Service Manual page 6

March 2019
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].
ADJUSTMENT
ADJUSTMENT
NO.
REFERENCE 1 000
FREQUENCY
TX OUTPUT 1 013
POWER
(at 7.2 V) 014
2
3 015
TX OUTPUT 016
1
POWER
(at 11.0 V) 2 017
018
3
MODULATION 1 019
(at 7.2 V)
020
2
3 021
022
4
5 023
024
6
7 031
032
8
9 033
034
10
11 035
036
12
(Replacement page)
TRANSCEIVER'S
ITEM
CONDITION
NAME
REF • Frequency: 136.975 MHz
• Transmitting
BATT • Frequency: 118.000 MHz
PL
• Transmitting
BATT
• Frequency: 127.500 MHz
PM
• Transmitting
BATT • Frequency: 136.975 MHz
PH
• Transmitting
EXT PL
• Frequency: 118.000 MHz
• Transmitting
EXT PM • Frequency: 127.500 MHz
• Transmitting
EXT PH
• Frequency: 136.975 MHz
• Transmitting
BATT • Frequency: 118.000 MHz
25MML • Transmitting
BATT
• Frequency: 127.500 MHz
25MMM
• Transmitting
BATT • Frequency: 136.975 MHz
25MMH • Transmitting
BATT
• Frequency: 118.005 MHz
8MML
• Transmitting
BATT • Frequency: 127.505 MHz
8MMM • Transmitting
BATT
• Frequency: 136.980 MHz
MMH
• Transmitting
BATT • Frequency: 118.000 MHz
25NML • Transmitting
BATT
• Frequency: 127.500 MHz
25NMM
• Transmitting
BATT • Frequency: 136.975 MHz
25NMH • Transmitting
BATT
• Frequency: 118.005 MHz
8NML
• Transmitting
BATT • Frequency: 127.505 MHz
8NMM • Transmitting
BATT
• Frequency: 136.980 MHz
8NMH
• Transmitting
OPERATION
• Connect the RF power meter to the
antenna connector.
• Loosely couple the frequency
counter to the antenna connector.
• Attach the fully charged battery
pack.
• Connect the RF power meter to the
antenna connector.
• No audio applied to [MIC].
• 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].
• 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:
LPF:
De-emphasis: OFF
Detector:
• Connect the audio generator to
[MIC], and set it to:
Frequency:
Level:
Waveform:
Set the audio generator to:
Level:
4-4a
VALUE
136.975 MHz
(±100 Hz)
1.8 W
1.8 W
90% (±2%)
OFF
USA, EXP:
20 kHz
80% (±2%)
EUR, AUS:
(P−P)/2
90% (±2%)
1 kHz
200 mV rms
Sine wave
30% (±5%)
20 mV rms