Adjustments On The Rf-A Unit - Icom IC-9100 Service Manual

4-5 ADJUSTMENTS ON THE RF-A UNIT

ADJUSTMENT ITEM
TX ADJUSTMENT
(TX power)
RX ADJUSTMENT
(Sensitivity)
MIXER BALANCE
RX SUPRIOUS*
IMAGE REJECTION
*: For all models except [TPE] and [KOR].
†
; The output level of the standard signal generator (SSG) is indicated as the SSG's terminated circuit.
TRANSCEIVER'S
CONDITION
• Frequency: 14.100 MHz
• Mode: USB
• Transmitting
• Frequency: 14.150 MHz
• Mode: USB
• Receiving
• Frequency: 14.150 MHz
• Mode: USB
• Receiving
• Frequency: 3.621565 MHz
• Mode: USB
• [PREAMP]: OFF
• Receiving
• Frequency: 14.150 MHz
• Mode: USB
• [PREAMP]: OFF
• Receiving
OPERATION
1) Connect an RF power meter to
[ANT1].
2) Connect an audio generator and
millivoltmeter to [MIC], and then
set it as;
Frequency : 1.5 kHz
†
Level : 1 mV
1) Connect an SSG to [ANT1], and
then set it as;
Frequency : 14.1515 MHz
†
Level : –15 dBµ (–122 dBm)
Modulation: None
2) Connect a millivoltmeter and a
speaker to [EXT-SP].
1) Connect a terminator to [ANT1].
2) Connect a spectrum analyzer to
the J741.
• Connect a millivoltmeter to [EXT-
SP].
1) Connect an SSG to [ANT1], and
then set it as;
Frequency : 14.0765 MHz
†
Level : +50 dBµ (–57 dBm)
Modulation : None
2) Connect a millivoltmeter and a
speaker to [EXT-SP].
4 - 6
MEASURE ADJUST
POINT POINT
[ANT1] L612 Max. TX power
[EXT-SP] L723, L1071 Max. AF output
J741 R725, R726 Min. LO level
78.605 MHz)
[EXT-SP] Min. AF output
[EXT-SP] R1276, Min. AF output
C1121
(Repeatedly)
VALUE
level
(Freq.=
level
level