Transmit Adjustment - Icom IC-F4021T Service Manual

6-3 TRANSMIT ADJUSTMENT

Select an adjustment item using [↑] / [↓] keys, then set to the specifi ed value using [←] / [→] keys on the connected PC's keyboard.
ADJUSTMENT
OUTPUT 1 • Channel
POWER • Transmitting
[Power (Hi)]
[Power (L2)] 2 • Channel
• Transmitting
[Power (L1)] 3 • Channel
• Transmitting
FM 1 • Channel
DEVIATION
• Connect an audio generator to the JIG
(NARROW)
cable and set as;
[MOD N]
Frequency
Level
• Set the FM deviation meter to same condi-
tion as "MODULATION BALANCE."
• Transmitting
(WIDE) 2 • Channel
[MOD ratio] • Transmitting
(MIDDLE)* 3 • Channel
[MOD ratio] • Transmitting
MODULATION 1 • Channel
BALANCE • No audio applied to the JIG cable.
[BAL] • Set an FM deviation meter same as;
HPF
LPF
De-emphasis
Detector
• Transmitting
1 • Channel
CTCSS/DTCS
• No audio applied to the JIG cable.
DEVIATION
• Set the FM deviation meter to same condi-
[CTCS/DTCS]
tion as "MODULATION BALANCE."
• Transmitting
*; [EUR] only.
ADJUSTMENT CONDITION
: CH 3
: CH 4
: CH 5
: CH 5
: 1.0 kHz
: 150 mV rms
: CH 6
: CH 7
: CH 5
: OFF
: 20 kHz
: OFF
: (P–P)/2
: CH 8
MEASUREMENT
UNIT OPERATION
Top Connect an RF power meter to
panel the antenna connector.
Top Connect the FM deviation me-
panel ter to the antenna connector
through an attenuator.
Top Connect the FM deviation me-
panel ter to the antenna connector
through an attenuator.
Top Connect an FM deviation meter to
panel the antenna connector through
an attenuator.
6 - 5
VALUE
4.0 W
2.0 W
1.0 W
±2.05 to ±2.15 kHz
±4.05 to ±4.15 kHz
±3.15 to ±3.25 kHz
Set to square wave form
±0.68 to ±0.72 kHz