Figure 8-46. Receiver Front End Circuit - Motorola APX 1000 Detailed Service Manual

Schematics, Boards Overlays, and Parts Lists: Transceiver (RF) Boards: UHF1 (84012313002 / PC000353A01)
IF1902
INPORT IF
1
IN
IF1903
INPORT
IF
DIG_CTRL_RXU
1
IN
IF1901
337
IF
63 440
1
INPORT IN
R1910
C1925
R1906
9.1K 100PF
10K
C1926
ANA_RX_FE_TUNE 0.1UF
VR1905
1SV305
1
C1928 C1929
5.6PF 10PF
IF1900
IF
1
INPORT IN
TL_RX_UHF1_FE_IN
E1921
DC_LIN_1_8V_A
1 2
DC_RX_UHF1_LNA_C_13A
CTRL_RX_UHF1_LNA_A = 3V (HIGH), LNA'S TURN ON
CTRL_RX_FE_UHF1_LNA_B_13A
3
22K
1
R1921
75K
Q1920
MUN5212T
R1907
R1922
10K
120K
VR1906
L1909
L1910
1SV305
18NH
18NH C1920
2 2 1
4.7UF
L1908
C1953
3.6NH
5.6PF
C1952
10PF
C1931
C1935 C1939
75PF
2.7PF
2.7PF
D1970
L1915 MMBD352
C1970
C1958
7.2NH
DNP 2.4PF
6.8PF
R1970
10
PREFILTER MODIFIED XTS5000
C1938
3.3PF
DC_RX_UHF1_LNA_A_13A
DC_RX_UHF1_LNA_D_13A
R1923 R1924
10K 33 R1911
INPORT 9.1K
BC858CD
IN
347
Q1922
C1924
2 5 BC858CD
4.7UF
C1923
Q1922
100PF
ANA_RX_FE_TUNE
R1925
DC_RX_FE_UHF1_LNA_B_13A
2.7
L1935
18NH
C1940
100PF
C1922
100PF
R1936
RF_RX_FE_UHF1_LNA_C_13A C1936
0
9.1PF
L1934
47NH R1935
C1901
1.2K
100PF
1 U1932 C1971
1.5PF
BFR380F
RF_RX_FE_UHF1_LNA_E_13A
R1972
10
L1936
1.6NH
R1908
R1909
10K
10K
VR1907 VR1908
L1913
L1914
1SV305
1SV305
18NH
18NH
1 2 2 1
L1912
C1964
C1963
3.6NH
C1957
C1956 5.6PF
10PF
5.6PF 10PF
C1959 C1961
2.7PF
2.7PF
L1917
C1900
C1942
3.6NH
6.8PF 8.2PF
C1960
POSTFILTER MODIFIED XTS5000
6PF
8-113
C1903
4PF
RF_RX_UHF1_FE_OUT
DNP
IF1904
R1900
IF
0 1
OUT
OUTPORT
1 2
L1900
C1930
L1901
10NH
C1932
22PF 3.9NH
DNP
22PF
DNP
DNP

Figure 8-46. Receiver Front End Circuit