Motorola GP series Detailed Service Manual

UHF PCB 8415234H08 Schematics 3-133
UHF (403-470 MHz) Voltage Controlled Oscillator Schematic Diagram
VSF
RX_INJ
TX_INJ
100pF
C281
R245
240
L273
33nH390nH
L281
L271
68nH
C272
NU
C276
if
ind
2.2uF
C273
0.1uF
0.1uF
C286
C271
NU
Rx_sw
PRESC
Tx_sw
10
13
12
8
7
SHIELD
VCO TOP SHIELD VCO BOTTOM SHIELD
SH241
1
SHIELD
SH242
1
AUX3
5V
2
4
10K
10K
47K
47K
47K
47K
4.7K
4.7K
1
3
Q260
DD
C297
.01uF
1K
R260
Q261
2
4
1
3
100pF
C289
AUX4
917 11
TX_OUT
TX_SWITCH
PRESC_OUT
RX_OUT
RX_SWITCH
U241
CD8408DK
SUPER_FLTR
TRB_IN
TX_BASE
TX_EMITTER
TX_IADJ
RX_BASE
RX_EMITTER
RX_IADJ
COLL_RFIN
FLIP_IN
3
19
16
15
1
5
6
2
4
20
18 14
VCC_LOGIC
VCC_BUFFERS
GND_FLAG
GND_LOGIC GND_BUFFERS
100pF
C255
R253
7.5K
C254
3.6pF
R254
7.5K
Tx_sw
3
R251
18
L253
RESONATOR
1
P1
P2
2
P3
330
R252
0.1uF
C248
R248
30
C252
10pF
CR251
33nH
L251
C247
100pF
C253
1.5pF
C251
100pF
A2
2
CR241
1
A1
C241
100pF
VCTRL
CR243
L241
390nH
220nH
L242
CR242
7.5pF
C243
C244
2pF
Rx_sw
R243
10K
C245
2.4pF
L282
390nH
1
3
2 Q241
BFQ67W
R244
12K
7.5pF
C250
C242
7.5pF
1
2
3
L243
RESONATOR
100pF
C246
R241
18
R242
200
100pF
C285
VSF

Motorola GP series Specifications

General

Operating Temperature	-30°C to +60°C
Frequency Range	136-174 MHz
Number of Channels	16
Channel Spacing	12.5 kHz / 25 kHz
Battery Life	8 hours (with standard battery)
Operating Voltage	7.5V DC
Ingress Protection	IP54
MIL-STD	810 C, D, E, F