Motorola HT Series User Manual

9-460 900 MHz Circuit Board/Schematic Diagrams and Parts List (PCB 8485910Z01)
VCC_LOGIC
SUPER_FLTR
TRB_IN
TX_BASE
TX_EMITTER
TX_IADJTX_OUT
TX_SWITCH
VCC_BUFFERS
GND_FLAG GND_LOGIC
PRESC_OUT
RX_BASE
RX_EMITTER
RX_IADJRX_OUT
RX_SWITCH
U250
COLL_RFIN
FLIP_IN
GND_BUFFERS
19
16
15
1
10
13
1418
17
12
5
6
2
8
7
3
4
20
11 9
4
1
3
Q252
2
10K
47K
47K
4.7K
TX_INJ
AUX4
AUX3_5V
RX_SW
TX_SW
VCTRL
VSF
PRESC
RX_LO
Tx_sw
RX_SW
6 dBm TYPICAL
0 dBm to RX_FE
1.9 V WHEN SELECTED
1.9 V WHEN SELECTED
TO PA
Supply from U201
2 to 11 VDC
4.6 V Super Filter
Steering Line
0V for RX
5V for TX
VCO Select Line
Allows 3V logic from frac-N to control 5V logic of VCO
LEVEL SHIFT FOR VCO SELECT
TX VCO COMPONENTS
Freq Range
896 to 941 MHz
1.225 GHz
825 to 831 MHz
Freq Range
RX VCO COMPONENTS
OPTIONAL BIAS TUNING VOLTAGE
TX BUFFER
5 mA CURRENT DRAW
5V WHEN SELECTED
SWITCHED SUPPLIES FOR VCOs ON THIS PAGE
920 MHz
VCO TOP SHIELD
VCO TOP SHIELD
VCO BOTTOM SHIELD
L256
100nH
L250
4.7nH
0.1uF
100nH
L259
L257
100nH
100nH
L260
2.7pF
C279
C270
0.1uF
R270
2pF
33
C265
33
R272
FL251
12K
270
R263
R267
R271
33
0.1uF
C252
10
R253
33
R261
33nH
L254
C261
68pF
C258
L258
0.1uF
SH251
100nH
SH252
L253
390nH
C280
0.1uF
SH250
C251
56pF
C289
22K
.033uF
R268
C276
4.3pF
56pF
L262
100nH
C254
CR252
C277
56pF
3.6pF
C281
47pF
C290
56pF
C291
R251
100
C269
.033uF
C292
56pF
R254
47K
L261
15nH
C266
2pF
56pF
C260
R273
33
68pF
C295
0.1uF
C293
33
CR251
R262
Q251
L263
22nH
56pF
C286
C273
3pF
56pF
C257
R274
120
C256
6.8pF
C282
68pF
56pF
C294
C253
68pF
C271
5.6pF
47pF
C284
1pF
C283
L252
100nH
27K
R266
C264
0.1uF
C274
56pF
C259
2.2uF
330
0.1u
F
R255
C262
FL252
270
8.2nH
L264
R250
C285
R257
1K
0
18K
R265
R281
C263
47nH
56pF
C268
1pF
L265
R264
270
C267
2pF
CR253
R275
10
C250
0.1uF
FL0830709O
Figure 9-283. 900 MHz Voltage Controlled Oscillator Schematic Diagram

Motorola HT Series Specifications

General

Brand	Motorola
Model	HT Series
Category	Two-Way Radio
Language	English