Icom IC-91A Service Manual

6-2 TRANSMITTER ADJUSTMENT
• Set the specified value using [DIAL], and push [BAND] to store the set value. Then push [2] to move to the next adjustment item.
NOTE: “REFERENCE FREQUENCY” should be adjusted before “FM DEVIATION” and “RXBPF.” Otherwise, these adjustments
will not be adjusted properly.
ADJUSTMENT ITEM ADJUSTMENT CONDITION VALUE
REFERENCE
FREQUENCY
[Fr] (4
1 • Connect an RF power meter to the antenna connector.
• Loosely couple a frequency counter to the antenna connector.
• Transmitting
440.000 MHz
TX POWER
IDLING 5.0 V
(VHF)
[id] KF
1 • Power supply voltage : 5.0 V
• Adjustment value of 2Q: 00
• Connect an RF power meter to the antenna connector.
• Transmitting
10 mW
(UHF) 2 • Transmitting
FINAL 5.0V
(VHF)
[Po] 2Q
1 • Transmitting
0.1 W
(UHF) 2 • Transmitting
TX POWER
IDLING 7.4V
[Id] +F
(VHF)
1 • Power supply voltage : 7.4 V
• Adjustment value of 2Q: 00
• Transmitting
[HIGH]: 5.0 W
[LOW]: 40–100 mW
(UHF) 2 • Transmitting
NOTE: Take notes of this adjustment value.
(This value is used as reference for “TX POWER IDLING 13.5V” adjustment)
FINAL 7.4V
[Po] 2Q
(VHF)
1 • Transmitting
[HIGH]: 5 W
[LOW]: 0.5 W
(UHF) 2 • Transmitting
TX POWER
IDLING 13.5V
[Id] +F
(VHF)
1 • Power supply voltage : 13.5 V
• Adjustment value of 2Q: 00
• Transmitting
[HIGH]:
• Adjustment value: 58
or
• TX pwr.: 3.0–4.0 W
(1)
[LOW]: 40–100 mW
(UHF) 2 • Transmitting [HIGH]
• Adjustment value: 58
or
• TX power: 3.0–4.0 W
[LOW]:
Adjustment value: (2)
FINAL 13.5V
[Po] 2Q
(VHF)
1 • Transmitting
[HIGH]: 4.6–5.2 W
[LOW]: 0.4–0.6 W
(UHF) 2 • Transmitting
6 - 3
(1); Adjustment value for the case If the output power exceeds 4.0 W.
(2); Set to the value in which 3 is subtracted from the [Id] value set by “TX POWER IDLING 7.4 V (UHF)/[LOW].“

Icom IC-91A Specifications

General

Brand	Icom
Model	IC-91A
Category	Transceiver
Language	English