Figure 8-99. Receiver Front End Circuit - Motorola APX 3000 Detailed Service Manual

Schematics, Boards Overlays, and Parts Lists: Main Board Block: UHF2 (84012616001)
IF1902M20
IF
1
INPORT
IN
IF1903M20
IF
1 DIG_CTRL_RXU
INPORT IN
IF1901M20 337
INPORT IF
1
63 440
IN
R1910M20
9.1K
R1906M20
C1925M20
10K
100PF
ANA_RX_FE_TUNE
VR1905M20
1SV305
1 2
C1928M20
C1929M20
3.3PF
4.7PF
IF1900M20 C1935M20
INPORT
IF 2.7PF
1
IN
TL_RX_UHF1_FE_IN
L1915M20
C1938M20
E1921M20
DC_LIN_1_8V_A
DC_RX_UHF1_LNA_C_13A
CTRL_RX_UHF1_LNA_A = 3V (HIGH), LNA'S TURN ON
Q1920M20
CTRL_RX_FE_UHF1_LNA_B_13A
MUN5212T
3
22K
1
R1921M20
75K
BC858CD
Q1922M20
R1907M20
R1922M20
10K
120K
L1910M20 VR1906M20
L1909M20
18NH 1SV305
18NH C1920M20
2 1
4.7UF
L1908M20
C1953M20
3.6NH
3.3PF
C1952M20
4.7PF
C1939M20 C1931M20
75PF
2.7PF
D1970M20
MMBD352 C1970M20
C1958M20
7.2NH DNP 2.4PF
12PF
R1970M20
10
PREFILTER MODIFIED XTS5000
3.6PF
DC_RX_UHF1_LNA_A_13A
DC_RX_UHF1_LNA_D_13A
R1923M20 R1924M20
10K
33
R1911M20
9.1K
INPORT IN
347
C1924M20
2 5 4.7UF
C1954M20
100PF
ANA_RX_FE_TUNE
DC_RX_FE_UHF1_LNA_B_13A R1925M20
2.7
L1935M20
18NH
C1940M20
C1922M20 100PF
100PF
R1936M20
RF_RX_FE_UHF1_LNA_C_13A
0
C1936M20
9.1PF
L1934M20
47NH
C1901M20
R1935M20
100PF
1.2K
C1971M20
U1932M20
1
1.5PF
BFR380F
RF_RX_FE_UHF1_LNA_E_13A R1972M20
10
L1936M20
1.6NH
R1908M20
10K R1909M20
10K
VR1908M20
L1914M20 L1913M20
1SV305
18NH 18NH
1 2 2 1
VR1907M20
1SV305
L1912M20 C1964M20
C1963M20
3.3PF
3.6NH 5PF
C1956M20 C1957M20
3.3PF 5PF
C1959M20 C1961M20
2.7PF 2.7PF
L1917M20
C1942M20
3.6NH
C1900M20
15PF
8.2PF
C1960M20
4.7PF
POSTFILTER MODIFIED XTS5000
8-175
C1903M20
4PF
RF_RX_UHF1_FE_OUT
DNP
IF1904M20
R1900M20
IF
0 1
OUT
OUTPORT
L1901M20 L1900M20
10NH
C1930M20 3.9NH
C1932M20
DNP
22PF
22PF
DNP
DNP

Figure 8-99. Receiver Front End Circuit