Figure 8-87. Receiver Front End Circuit - Motorola APX 1000 Detailed Service Manual

Schematics, Boards Overlays, and Parts Lists: Transceiver (RF) Boards: UHF2 (84012432001 / PC000354A01)
INPORT
IF1902
IF
1
IN
INPORT
IF1903
IF
1 DIG_CTRL_RXU
IN
INPORT 337
IF1901
IF
R1910
1
63 440
IN
9.1K
ANA_RX_FE_TUNE
1
INPORT
IF1900
IF
C1935
1
IN
2.7PF
TL_RX_UHF1_FE_IN
E1921
DC_LIN_1_8V_A
DC_RX_UHF1_LNA_C_13A
CTRL_RX_UHF1_LNA_A = 3V (HIGH), LNA'S TURN ON
MUN5212T
R1921
3
CTRL_RX_FE_UHF1_LNA_B_13A
22K 22K
1
75K
Q1920
R1922
120K
VR1906
1SV305 C1920
L1910 L1909
2 2 1
4.7UF
2113946D07
18NH 18NH
C1939 DNP C1931
2.7PF 75PF
PREFILTER MODIFIED XTS5000
DC_RX_UHF1_LNA_A_13A
DC_RX_UHF1_LNA_D_13A
R1923 R1924
10K 33
INPORT
R1911
4813973M75
IN
BC858CD 347
9.1K
Q1922
2113946D07
4813973M75
C1923 C1924
2 5
BC858CD 100PF 4.7UF
Q1922
ANA_RX_FE_TUNE
DC_RX_FE_UHF1_LNA_B_13A
R1925
2.7
0613952Q11
L1935
C1940
100PF
C1922
100PF
RF_RX_FE_UHF1_LNA_C_13A
C1901 C1936
L1934
47NH
100PF 9.1PF
1 U1932
BFR380F
4885316E32
RF_RX_FE_UHF1_LNA_E_13A
L1936
1.6NH
VR1908
1SV305
L1914 L1913
1 2 2 1
18NH 18NH
DNP
C1903
4PF
C1959 C1961
2.7PF 2.7PF
L1901
3.9NH
POSTFILTER MODIFIED XTS5000

Figure 8-87. Receiver Front End Circuit

8-193
RF_RX_UHF1_FE_OUT
IF1904
IF
R1900
1
OUT
0
OUTPORT