Vhf Voltage Controlled Oscillator Schematic Diagram - Motorola GP88s Service Manual

Circuit Board/Schematic Diagrams and Parts List
R5
R5_1_VCO
R3802
100 R:4.6V
T: 0V
C3804
0.1uF
R3807
L3801 1K
100nH NU
RX_INJ_1_VCO
C3801
RX_INJ
4.7pF Q3801
C3802
R3801
22pF
220
R3808
NU
NU
R3804
10
10K
R:0.9V
T: 0V
C3803 R3803
220
1000pF
RF mV RMS measured with high impedance probe.
SH3801 SH3802
SHIELD SHIELD SHIELD SHIELD
1 1
Vdda_3_VCO
R:4V
T: 2.8V
R3811
100
C3810 L3811 L3812 C3811 C3812
10pF 100nH 100nH 0.1uF 0.1uF
NU
800mV
RMS
R3806 10
TX_OUT
C3806
22
8
RX_OUT
12
100pF
PRESC_OUT
7
RX_SWITCH
R3805
C3805
13
24K
4.7pF TX_SWITCH
C3808
15pF
C3809 L3809
500mV
27pF 27nH
RMS
T5
TX_INJ_1_VCO
3.1V
R3816
L3816
VSF
100nH
1K
TX_INJ
C3816
6.8pF
Vdda VSF
VSF_1_VCO
3.3V
4.55V
L3813
1uH
R3817
0
C3822
C3813
R3818 1000pF
.01uF
0
NU
R3821
C3818
220
.022uF
18 14
1
TX_IADJ
2
RX_IADJ
3
SUPER_FLTR R3825
4
COLL_RFIN
5
U3801 RX_BASE 33
6
50U54
RX_EMITTER
16
TX_BASE
15
R3831
TX_EMITTER
20
FLIP_IN
10K
19
TRB_IN
17 11 9
C3821
.01uF
R3832
12K
C3832
1000pF
C3815
T: 250mV RMS
1000pF
R3834
R:0V
R3833
T: 3.1V 47
220
C3833
T5_1_VCO
R3830 R3829 4.7pF
TRB
0
0 NU TRB_1_VCO
R3836
R3835
PRESC_1_VCO
VSF
PRESC 10K
47K
D3832
R: 1V RMS
R: 250mV RMS
C3830
C3825
68pF
15pF
R3822
47
C3824 L3821 L3822 L3823
56pF 56nH 47nH 47nH
C3826
4.7pF
R3826
18
C3823
L3826
.01uF
1uH R:1.7V
T: 0V
BIAS_ADJ_1_VCO
R3812
BIAS_ADJ
100K NU
C3827
R3823
R3824
0.22uF
33K
22K
C3835
T: 1V RMS
6.8pF
C3836
15pF
C3834 L3832 L3833
L3831
68nH 56nH
56pF
56nH
VCO_MOD
VCO_MOD_1_VCO

VHF Voltage Controlled Oscillator Schematic Diagram

-19
9B
R, T: 3.5V-9.5V
@ 135MHz-174MHz
D3821
VCTRL_1_VCO
L3824 R3828
1uH
100
VCTRL
C3828
L3825
.01uF
100nH
C3829
.01uF
L3834 C3842
1uH 1000pF
D3831