Icom IC-R20 Service Manual - Page 48
Board layouts, RF unit (top
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SECTION 9 BOARD LAYOUTS 9-1 RF UNIT • TOP VIEW to LOGIC UNIT J5 21 40 B_DET B_R3V GND B_NOISE B_RSSI +3V GND PLLBSTB PLLDSTB VP GND PLLESTB PLLCSTB PLLASTB RFO A_DET A_R3V GND A_NOISE A_RSSI LD2 +3S GND B_VCO2 B_VCO3 B_VCO4 PLLCK PLLDATA STR2 HFC B1C B2C B3C D CLK LD1 EAR A_VCO1 A_VCO2 GND 20 J1 1 9 - 1 The combination of this page and the next page shows the unit layout in the same configuration as the actual P.C. Board. W2 W1 ANT
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9 - 1
The combination of this page and the next page shows
the unit layout in the same configuration as the actual
P.C. Board.
J1
1
40
20
21
LD2
+3S
GND
B_VCO2
B_VCO3
B_VCO4
PLLCK
PLLDATA
STR2
HFC
B1C
B2C
B3C
D
CLK
LD1
EAR
A_VCO1
A_VCO2
GND
B_DET
B_R3V
GND
B_NOISE
B_RSSI
+3V
GND
PLLBSTB
PLLDSTB
VP
GND
PLLESTB
PLLCSTB
PLLASTB
RFO
A_DET
A_R3V
GND
A_NOISE
A_RSSI
to LOGIC UNIT J5
W2
W1
ANT
SECTION 9
BOARD LAYOUTS
9-1
RF UNIT
• TOP VIEW