Motorola APX 1000 Detailed Service Manual page 925

Schematics, Boards Overlays, and Parts Lists: Transceiver (RF) Boards: UHF1 (84012620001)
IF1902M20
1
IN
IF1903M20
DIG_CTRL_RXU
1
IN
IF1901M20
R1910M20
1
IN
ANA_RX_FE_TUNE
1
VR1905M20
C1929M20
C1928M20
IF1900M20
C1935M20
1
IN
TL_RX_UHF1_FE_IN
E1921M20
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
R1921M20
3
22K
1
Q1922M20
Q1920M20
R1922M20
R1907M20
VR1906M20
L1910M20 L1909M20 C1920M20
2 2 1
L1908M20
C1953M20
C1952M20
C1939M20 C1931M20
D1970M20
C1970M20
L1915M20 C1958M20
R1970M20
PREFILTER MODIFIED XTS5000
C1938M20
DC_RX_UHF1_LNA_A_13A
DC_RX_UHF1_LNA_D_13A
R1923M20 R1924M20
R1911M20
IN
Q1922M20
2 5
C1923M20 C1924M20
ANA_RX_FE_TUNE
DC_RX_FE_UHF1_LNA_B_13A
R1925M20
L1935M20
C1940M20
C1922M20
R1936M20
RF_RX_FE_UHF1_LNA_C_13A
C1901M20 C1936M20
L1934M20
R1935M20
C1971M20
1
U1932M20
RF_RX_FE_UHF1_LNA_E_13A
R1972M20
L1936M20
R1909M20
VR1908M20
L1914M20 L1913M20
1 2 2 1
VR1907M20
L1912M20 C1963M20 C1964M20
C1956M20 C1957M20
C1959M20 C1961M20
L1917M20 C1942M20 C1900M20
C1960M20
POSTFILTER MODIFIED XTS5000
8-94
RF_RX_UHF1_FE_OUT
C1903M20
IF1904M20
R1900M20
1
L1901M20 OUT
1 2
C1930M20 C1932M20
L1900M20
Figure 8-33. Receiver Front End Circuit