Icom IC-R20 Service Manual - Page 24

Software adjustments, R-DIAL], LOCK], ADJUSTMENT, ADJUSTMENT CONDITION, OPERATION

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5-2 SOFTWARE ADJUSTMENTS ADJUSTMENT ADJUSTMENT CONDITION OPERATION REFERENCE 1 • Connect the frequency counter to the check point • Rotate [R-DIAL] to set to 247.05000 MHz. FREQUENCY CP18 on the RF unit. • Push [• LOCK] key. [REF] • Receiving CENTER VOLTAGE 1 • Dual watch mode : ON • Adjust L21 to CP1 voltage to be 1.0 V. • Set the receiver to [A-BAND] and FM mode. • Operating frequency : 145.100 MHz • Connect an SSG to the antenna connector and set as Level : 1 mV* (-47 dBm) Frequency : 145.100 MHz Modulation : OFF • Connect the Digital multimeter to the check point CP1 on the RF unit. • Receiving 2 • Set the receiver to [B-BAND] and FM mode. • Adjust L105 to CP11 voltage to be 1.0 V. • Operating frequency : 145.100 MHz • Connect an SSG to the antenna connector and set as Level : 1 mV* (-47 dBm) Frequency : 145.100 MHz Modulation : OFF • Connect the Digital multimeter to the check point CP11 on the RF unit. • Receiving BFO [LSB] 1 • Connect the frequency counter to the check point on • Rotate [R-DIAL] to set to 448.5 kHz. the LOGIC unit (See page 5-3). • Push [• LOCK] key. • Receiving [USB] 2 • Connect the frequency counter to the check point on • Rotate [R-DIAL] to set to 451.5 kHz. the LOGIC unit (See page 5-3). • Push [• LOCK] key. • Receiving [CW] 3 • Connect the frequency counter to the check point on • Rotate [R-DIAL] to set to 449.2 kHz. the LOGIC unit (See page 5-3). • Push [• LOCK] key. • Receiving SSB-IF SHIFT [LSB-IFS] 1 • Connect an SSG to the antenna connector and set as • Set an SSG's level to 10 dB S/N sensitivity (A). Frequency : 14.0990 MHz • Measure the AF output level while the IC-R20 Modulation : OFF outputs 1 kHz signal (B). • Receiving 2 • Set an SSG as Level Frequency Modulation • Receiving : A+ 35 dB : 14.1005 MHz : OFF • Measure the AF output level (C). • If AF output level C is lower than B, skip this adjustment. • If AF output level C is higher than B, rotate [R-DIAL] to adjust the AF output level to the same level as B. • Push [• LOCK] key. [USB-IFS] 3 • Connect an SSG to the antenna connector and set as • Set an SSG's level to 10 dB S/N sensitivity (A). Frequency : 14.1010 MHz • Measure the AF output level while the IC-R20 Modulation : OFF outputs 1 kHz signal (B). • Receiving 4 • Set an SSG as Level Frequency Modulation • Receiving : A+ 35 dB : 14.0995 MHz : OFF • Measure the AF output level (C). • If AF output level C is lower than B, skip this adjustment. • If AF output level C is higher than B, rotate [R-DIAL] to adjust the AF output level to the same level as B. • Push [• LOCK] key. *This output level of a standard signal generator (SSG) is indicated as SSG's open circuit. 5 - 2

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5 - 2
5-2 SOFTWARE ADJUSTMENTS
REFERENCE
FREQUENCY
[REF]
CENTER
VOLTAGE
BFO
[LSB]
[USB]
[CW]
SSB-IF
SHIFT
[LSB-IFS]
[USB-IFS]
1
1
2
1
2
3
1
2
3
4
• Connect the frequency counter to the check point
CP18 on the RF unit.
• Receiving
• Dual watch mode
: ON
• Set the receiver to [A-BAND] and FM mode.
• Operating frequency
: 145.100 MHz
• Connect an SSG to the antenna connector and set as
Level
: 1 mV* (–47 dBm)
Frequency
: 145.100 MHz
Modulation
: OFF
• Connect the Digital multimeter to the check point CP1
on the RF unit.
• Receiving
• Set the receiver to [B-BAND] and FM mode.
• Operating frequency
: 145.100 MHz
• Connect an SSG to the antenna connector and set as
Level
: 1 mV* (–47 dBm)
Frequency
: 145.100 MHz
Modulation
: OFF
• Connect the Digital multimeter to the check point CP11
on the RF unit.
• Receiving
• Connect the frequency counter to the check point on
the LOGIC unit (See page 5-3).
• Receiving
• Connect the frequency counter to the check point on
the LOGIC unit (See page 5-3).
• Receiving
• Connect the frequency counter to the check point on
the LOGIC unit (See page 5-3).
• Receiving
• Connect an SSG to the antenna connector and set as
Frequency
: 14.0990 MHz
Modulation
: OFF
• Receiving
• Set an SSG as
Level
:
A
+ 35 dB
Frequency
: 14.1005 MHz
Modulation
: OFF
•
Receiving
•
Connect an SSG to the antenna connector and set as
Frequency
: 14.1010 MHz
Modulation
: OFF
•
Receiving
•
Set an SSG as
Level
:
A
+ 35 dB
Frequency
: 14.0995 MHz
Modulation
: OFF
•
Receiving
•
Rotate
[R-DIAL]
to set to 247.05000 MHz.
•
Push
[• LOCK]
key.
•
Adjust L21 to CP1 voltage to be 1.0 V.
•
Adjust L105 to CP11 voltage to be 1.0 V.
•
Rotate
[R-DIAL]
to set to 448.5 kHz.
•
Push
[
•
LOCK]
key.
•
Rotate
[R-DIAL]
to set to 451.5 kHz.
•
Push
[
•
LOCK]
key.
•
Rotate
[R-DIAL]
to set to 449.2 kHz.
•
Push
[
•
LOCK]
key.
•
Set an SSG
’
s level to 10 dB S/N sensitivity (
A
).
•
Measure the AF output level while the IC-R20
outputs 1 kHz signal (
B
).
•
Measure the AF output level (
C
).
•
If AF output level
C
is lower than
B
, skip this
adjustment.
•
If AF output level
C
is higher than
B
, rotate
[R-DIAL]
to adjust the AF output level to the same
level as
B
.
•
Push
[
•
LOCK]
key.
•
Set an SSG
’
s level to 10 dB S/N sensitivity (
A
).
•
Measure the AF output level while the IC-R20
outputs 1 kHz signal (
B
).
•
Measure the AF output level (
C
).
•
If AF output level
C
is lower than
B
, skip this
adjustment.
•
If AF output level
C
is higher than
B
, rotate
[R-DIAL]
to adjust the AF output level to the same
level as
B
.
•
Push
[
•
LOCK]
key.
ADJUSTMENT
ADJUSTMENT CONDITION
OPERATION
*This output level of a standard signal generator (SSG) is indicated as SSG
’
s open circuit.