Frequency Synthesizer Circuits - Icom IC-9100 Service Manual

• VHF BAND
The 1st RX/TX LO signal is passed through the LO SW
(IC1454) and BPF (L1101–L1105, C1103–C1113), and
then applied to the LO AMP (IC1171). The amplified
signal is passed through the LPF (L1172, L1173,
C1174–C1176) and HPF (L1174, C1177, C1178), and
then applied to the RF-B UNIT.
The 1st RX/TX LO signal is passed through the HPF
(RF-B UNIT; L1491, L1492, C1491–C1493), and
amplifi ed by the LO AMP (RF-B UNIT; Q1471), and then
applied to the 1st TX mixer (RF-B UNIT; Q1551, Q1552)
or 1st RX mixer (RF-B UNIT; Q1051–Q1054), through
the LPF (RF-B UNIT; L1451–L1453, C1451–C1455).
• UHF BAND
The 1st RX/TX LO signal is passed through the
LO SW (IC1455) and BPF (D1203, L1201–L1203,
C1203–C1210, C1216, C1219), and then applied to
the LO AMP (IC1201). The amplified signal is passed
through the BPF (L1233–L1236, C1233–C1240), and
then applied to another LO AMP (IC1251). The amplifi ed
signal is applied to the RF-B UNIT, through the HPF
(L1273, L1274, C1273–C1275) and LPF (L1275, L1276,
L1282, L1283, C1276–C1280, C1284–C1286).
• FREQUENCY SYNTHESIZER
Q201
Q151
X151 IC201
Q251
PLL
AMP
BUFF LPF
IC
Q291
32 MHz
REF=500 kHz
BUFF
Q551
X2 BPF
64 MHz
PLL UNIT
Q27 1 Q301 IC351
390 MHz
DDS
MCL K
BPF
BUFF BUFF
A
Q1001
IC1051
DDS
BPF
BUFF
B
IC701
IC702
DDS
AM P D/A LPF
A
IC1501
IC1502
DDS
AM P D/A LPF
B
IC2002
IC2001
AM P DDS D/A
The 1st RX/TX LO signal is passed through the BPF
(RF-B UNIT; D2582, D2583, L2582, L2583, C2583,
C2584, C2587, C2607, C2608), and amplified by the
LO AMP (RF-B UNIT; IC2582). The amplified signal is
passed through the BPF (RF-B UNIT; D2584, D2585,
L2585, L2586, C2594, C2595, C2598, C2609, C2610)
and HPF (RF-B UNIT; L2491, L2492, C2491–C2494),
and applied to another LO AMP (RF-B UNIT; Q2471).
The amplifi ed signal is applied to the 1st TX mixer (RF-
B UNIT; D2551) or 1st RX mixer (RF-B UNIT; Q2051,
Q2052), through the LPF (RF-B UNIT; L2451, L2452,
C2451–C2458) and HPF (RF-B UNIT; D2421, D2422,
L2411, L2412, L2421, L2422, C2411–C2415, C2422,
C2423).
FI401
IC1451 IC1453
BRF
LPF
64.455 MHz
IC1452
IC1454
LPF
125.15(97.15)-163.15 MHz
IC1455
BPF
87.1875-102.1875 MHz
IC1456
Q701
BUFF BPF
491 kHz
Q901
AM P
491 kHz
BPF
10.814 MHz
Q1501
BPF
BUFF
7.214 MHz
BPF
Q1851
BUFF
10.914 MHz
BPF
Q2001
LPF BPF
BUFF
7.705~11.305~11.405 MHz
ATT
Q2151
BUFF
D2172
3 - 9
IC501
BPF AMP LP F HPF
64.485-86.455 MHz
BPF
86.455-124.455 MHz
I C1171
BPF AMP LPF BPF
125.15-163.15 MHz
IC1251
IC1201
AMP BPF AM P HPF LPF
174.375-204.375 MHz
BPF
30.2MHz
FI981
XTAL
BPF
D951
64.491 MHz
FI1881
XTAL
BPF
D1872
71.214MHz
AT T
FI2181
XTAL
BPF
Q57 1
71.705 MHz
BUFF
HF 1st RX/TX LO
to the RF-A UNIT
VHF 1st RX/TX LO
to the RF-B UNIT
UHF 1st RX/TX LO
to the RF-B UNIT
1.2 GHz band reference
to the optional UX-9100
HF 2nd RX LO
to the RF-A UNIT
3rd TX LO
to the MAIN UNIT
VHF 2nd RX LO
to the RF-B UNIT
UHF 2nd RX LO
to the RF-B UNIT
1.2 GHz band 3rd RX LO
to the optional UX-9100
2nd TX LO
to the MAIN UNIT