Furuno FELCOM 12, Service Manual

Page: 48 / 118

3-8
Figure 3-7
Block Diagram of RF CON
RX: 1530 ~ 1545MHz
TX: 1626.5 ~ 1646.5MHz
U23
U19
FL4
90.1MHz
VCXO
50kHz
RF CON (16P0147)
DIV
GPS: 1575.42MHz
DET
AGC
U24
U25
U27
FL5
U28
FL6
U29
Q12
U30
U31
Q10
U32
U33
U33
CR8
2nd Lo PLL
S-DATA
U7
U41
U39
DIV
U40
FL2
MAIN PLL
SUB PLL
U4
TCO-976X1 ( 15.6MHz)
REF CONT
1633.3MHz
890 ~ 915MHz
TX: 736.5 ~ 731.5MHz
RX Lo: 1620.05 ~ 1635.05MHz
TX Lo: 1626.5 ~ 1646.5MHz
U18
U10 U15
U34
PLL IC:
UNLOCK 1 UNLOCK 2
UNLOCK 3
REF (15.6MHz)
REF (15.6MHz)
REF (15.6MHz) SYN DATA, CK, LE3 SYN DATA, CK, LE2
SYN DATA, CK, LE1
REF (15.6MHz)
RX RF
TX RF
BPSK MOD
TX (16P01570)
GPS (GN-74)
S-DATA
REF CONT
50kHz IF (3dBm/1k
Ω
)
UNLOCK 2
UNLOCK 1
UNLOCK 3 SYN DATA
AGC LEV
CPU (16P0148)
15.6MHz
U10, 15, 34
SYN CK
U10, 15, 34
SYN LE3
U34
SYN LE2
U10
SYN LE1
U15
+5 /+12V
HPA ON
TX ON
GPS RF
HPA ON
+5V TX ON
+12V
HPA ON
U7, 8 Q7, 8
UNLOCK 1
UNLOCK 2
TX ON
90.05MHz
50kHz
+5V TX
TP1
TP2
TP3
R122
(4Vp-p)
U10 / 15 (MC145158) U34 (MC145170D1)