Icom IC-E2820 Service Manual page 20

¤ DEVIATION ADJUSTMENT
• CONNECTION FOR MODULATION ADJUSTMENTS
MODULATION ANALYZER
<SETTING>
HPF : OFF
LPF : 20 kHz
De-emphasis : OFF
Detector : (P-P)/2
ADJUSTMENT ITEM
144 MHz (Band (FM)
BAND Low) [L FMD]
DEVIATION
(FM-N)
(Left Band)
[L FMD]
(Band (FM)
Center) [L FMD]
(FM-N)
[L FMD]
(Band (FM)
High) [L FMD]
(FM-N)
[L FMD]
144 MHz (Band (FM)
BAND Low) [L FMB]
MODULATION
(FM-N)
BALANCE
[L FMB]
(Left Band)
(Band (FM)
Center) [L FMB]
(FM-N)
[L FMB]
(Band (FM)
High) [L FMB]
(FM-N)
[L FMB]
144 MHz BAND (FM)
DTCS MODULATION [L MDT]
(Left Band)
(FM-N)
[L MDT]
144 MHz (FM)
CTCSS MODULATION [L MCT]
(Left Band)
(FM-N)
[L MCT]
(0.1–1 GHz)
ATTENUATOR
(40 dB/100 W)
OSCILLOSCOPE
(DC to 10 kHz)
ADJUSTMENT CONDITIONS
1 • Connect a Modulation Analyzer to
the antenna connector (J1) through
an attenuator.
2
• Connect an Audio Generator to the
JIG cable (See the page 5-1 for the
connector and setting details).
3
• Transmitting
4
5
6
1 • Connect a Modulation Analyzer to
the antenna connector (J1) through
an attenuator.
2
• Connect an oscilloscope to the de-
tector terminal of the Modulation
Analyzer.
3
• No audio signals are applied to the
JIG cable (See the page 5-1).
4
• Transmitting
5
6
1 • Connect a Modulation Analyzer to
the antenna connector (J1) through
an attenuator.
2
• No audio signals are applied to the
JIG cable (See the page 5-1).
• Transmitting
1 • Connect a Modulation Analyzer to
the antenna connector (J1) through
an attenuator.
2
• No audio signals are applied to the
JIG cable (See the page 5-1).
• Transmitting
To J1
Rotate the right band's [DIAL] to
adjust the deviation, then push
the right band's [MAIN•BAND]
key during transmit.
Rotate the right band's [DIAL] to
adjust the wave form, then push
the right band's [MAIN•BAND]
key during transmit.
Rotate the right band's [DIAL] to
adjust the deviation, then push
the right band's [MAIN•BAND]
key.
Rotate the right band's [DIAL] to
adjust the deviation, then push
the right band's [MAIN•BAND]
key .
5 - 4
IC-E2820
DC power supply
(13.8 V/20 A)
−
⊕
Fuses
−
Black
20 A
⊕
Red
OPERATION
Wave form)
VALUE
±4.2 kHz
±2.1 kHz
±4.2 kHz
±2.1 kHz
±4.2 kHz
±2.1 kHz
(Square
±0.8 kHz
±0.75 kHz