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4 - 2
ADJUSTMENT
TRANSCEIVER’S
CONDITION
OPERATION
ADJUSTMENT
ITEM
VALUE
PEAK
• Frequency : 1270.000 MHz
(MAIN band)
• Mode
: SSB
• Receiving
1) Disconnect the "MDRIF" line from the
pins 6 and 7 of J3 (RF-C UNIT).
2) Connect a spectrum analyzer to the "MDRIF"
line as illustrated below, and then set it as;
Center
: 36 kHz
Span
: 20 kHz
RBW
: 300 Hz
VBW
: 100 Hz
3) Connect an SSG to [1200MHz ANT], and
then set it as;
Frequency : 1270.000 MHz
Modulation
:
None
Level
†
: 47 dBµ (–60 dBm)
L203
(RF-C UNIT)
Maximum
level.
(36 kHz signal)
RX TOTAL GAIN
R224
(MAIN-B UNIT)
–20 dBm
ATTENUATOR
• Attenuator : ON
• Receiving
R288
(MAIN-B UNIT)
–39 to –41 dBm
4-2 RECEIVE ADJUSTMENTS
¤
CONNECTION
• RF-C UNIT
• MAIN-B UNIT
†
; The output level of the standard signal generator (SSG) is indicated as the SSG’s terminated circuit.
J3
J12
L203
L251
L451
1R2REF
IF
R354
TO IC-9100
GND
GND
1R2TIF
MDRIF
To the
spectrum analyzer
T
o
the IC-9100
MDRIF
GND
MP246
R224
RXG
C56
CP15
R288
ATT