Figure 8-7. Receiver Front End Circuit - Motorola APX 3000 Detailed Service Manual

Schematics, Boards Overlays, and Parts Lists: Main Board Block: UHF1 (84012513001_A)
IF1902M20
INPORT IF
1
IN
IF1903M20
INPORT IF
DIG_CTRL_RXU
1
IN
IF1901M20
INPORT IF
1
IN
R1910M20
9.1K
R1906M20
C1925M20
337
100PF 10K
ANA_RX_FE_TUNE
63
1 2
VR1905M20
1SV305
C1928M20 C1929M20
5.6PF 10PF
IF1900M20 C1935M20
INPORT IF 2.7PF
1
IN
TL_RX_UHF1_FE_IN
L1915M20
7.2NH
C1938M20
3.3PF
E1921M20
DC_LIN_1_8V_A DC_RX_UHF1_LNA_A_13A
DC_RX_UHF1_LNA_C_13A
CTRL_RX_UHF1_LNA_A = 3V (HIGH), LNA'S TURN ON R1923M20
10K
CTRL_RX_FE_UHF1_LNA_B_13A
3
22K
1 BC858CD
R1921M20 Q1922M20
75K
Q1920M20 2
MUN5212T
DC_RX_FE_UHF1_LNA_B_13A
R1907M20
R1922M20
10K
120K
L1910M20
L1909M20
18NH
18NH C1920M20 C1922M20
2 1
4.7UF 100PF
VR1906M20
1SV305
L1908M20
C1953M20
3.6NH
5.6PF
C1952M20
L1934M20
10PF
C1931M20
75PF
C1939M20
D1970M20
2.7PF
C1970M20
MMBD352
C1958M20 2.4PF
DNP
6.8PF
R1970M20
10
PREFILTER MODIFIED XTS5000
DC_RX_UHF1_LNA_D_13A
R1924M20
33
R1911M20
INPORT 9.1K
IN
347
BC858CD C1924M20
5
Q1922M20
4.7UF
ANA_RX_FE_TUNE
R1925M20
2.7
L1935M20
18NH
C1940M20
100PF
C1956M20
5.6PF
RF_RX_FE_UHF1_LNA_C_13A
C1936M20
C1901M20
100PF 9.1PF
47NH
U1932M20 C1971M20
1
BFR380F 1.5PF
RF_RX_FE_UHF1_LNA_E_13A R1972M20
10
L1936M20
2.2NH
R1908M20
R1909M20
10K
10K
VR1907M20
L1913M20 VR1908M20
L1914M20
1SV305
18NH 18NH 1SV305
1 2 2 1
L1912M20
C1964M20
C1963M20
3.6NH
C1957M20 10PF 5.6PF
10PF C1903M20
4PF
DNP
C1959M20 C1961M20
2.7PF 2.7PF
L1917M20
C1930M20 L1901M20
C1942M20 C1900M20
3.6NH
3.9NH
6.8PF 8.2PF 22PF
DNP
C1960M20
POSTFILTER MODIFIED XTS5000
7.5PF
8-9
RF_RX_UHF1_FE_OUT
IF1904M20
R1900M20
IF
0
1
OUT
OUTPORT
L1900M20
10NH
C1932M20
DNP
22PF
DNP

Figure 8-7. Receiver Front End Circuit