Icom IC-7800 Service Manual page 49

RXPLL-A UNIT ADJUSTMENTS–Continued
ADJUSTMENT ADJUSTMENT CONDITION
IMAGE
1 • MAIN display frequency
RESPONSE
• Mode
• Connect an SSG to [ANT1]
connector and set as;
Frequency : 14.0765 MHz
Level
Modulation : OFF
• Receiving
1 • MAIN display frequency
RX
SENSITIVITY
• Mode
(50 MHz)
• Pre-amp. 2
• Connect an SSG to [ANT1]
connector and set as;
Frequency
Level
Modulation
• Receiving
1 • MAIN display frequency
IF THROUGH
(50 MHz)
• Mode
• Connect an SSG to [ANT1]
connector and set as;
Frequency : 64.455 MHz
Level
Modulation : OFF
• Receiving
*This output level of a standard signal generator (SSG) is indicated as SSG's open circuit.
UNIT
Rear
: 14.150 MHz panel
: USB
: 50 mV* (–13 dBm)
Rear
: 50.020 MHz panel
: USB
: ON
: 50.0215 MHz
: 0.32 µV* (–117 dBm)
: OFF
Front
: 50.020 MHz panel
: USB
: 50 mV* (–13 dBm)
MEASUREMENT
LOCATION
C o n n e c t a n A C Minimum audio level
m i l l i vo l t m e t e r t o
[ E X T S P ] j a c k
Ω
with 8 load.
C o n n e c t a n A C
Maximum audio level
millivolt meter to [EXT
Ω
SP] jack with 8
load.
S-meter
4 - 8
ADJUSTMENT
POINT
VALUE
UNIT
RX
PLL-A
RX
PLL-A
Minimum level RX
PLL-A
ADJUST
Adjust
repeatedly
R1516,
C1656
L1222
C1265