Motorola HT Series User Manual

800 MHz Circuit Board/Schematic Diagrams and Parts List (PCB 8471827L03) 9-439
CLK
RESET
CSX
UNSWB+
DATA
DATA_2_VCO
RESET_1_VCO
RESET_2_VCO
UNSWB+_1_VCO
CSX_2_VCO
CLK_2_VCO
UNSWB+_2_VCO
CSX_1_VCO
CLK_1_VCO
DATA_1_VCO
CHASSIS_CONTACTS
0 dBm to RX_FE
RX_LO
C253 82pF
M300
RX_LO_1_VCO
NU
0.5pF
C255
330
R255
R275
10
2
1
L254
33nH
1
390nH
L253
2
0.1uF
C262
C260
68pF
2.2uF
C259
Supply from U201
4.6 V Super Filter
VSF_1_VCO
R256
VSF
0
PRESC
68pF
C254
PRESC_1_VCO
Switched supplies for VCOs
on this page
10
13
12
8
7
Tx_sw
Rx_sw
TX_EMITTER
TX_IADJTX_OUT
TX_SWITCH
VCC_BUFFERS
VCC_LOGIC
RX_BASE
RX_EMITTER
RX_IADJRX_OUT
RX_SWITCH
SUPER_FLTR
TRB_IN
TX_BASE
COLL_RFIN
FLIP_IN
GND_FLAG GND_BUFFERS GND_LOGIC
PRESC_OUT
U250
50U54
16
15
1
1418
5
6
2
3
19
4
20
11 917
C288
0.5pF
NU
2
1
L260 220nH
33
R273
0.1uF
C280
68pF
C274
21
33
R262
C264
0.1uF
2pF
21
C267
R264
270
C266
2pF
3.3pF
C273
2
1
L259
220nH
OPTIONAL BIAS TUNING VOLTAGE
1.9 V when selected
DACRX
R267
12K
DAC_RX_VCO
2
1
R269
NU
.033uF
C269
Rx_sw
R265
30K
C258
0.1uF
220nH
21
L258
21
R270
33
Steering Line
2 to 11 VDC
VCTRL_1_VCO
CR252
CR253
68pF
C282
NU
VCTRL
220nH
L262
2
1
18nH
L263
21
1.2pF
C275
Freq Range
741 to 761 MHz
3.9pF
C278
C279
0.5pF
900 MHz
RESONATOR
U205
RX VCO Components
0
1.225 GHz
VCO TOP SHIELD VCO BOTTOM SHIELD
TX VCO Components
Freq Range
806 to 870 MHz
C272
NU
0.5pF
1pF
C268
SHIELD
SH250
1
5.6pF
21
L261
22nH
NU
C277
C291
0.5pF
5.6pF
21
C271
220nH
L256
2
1
3pF
C276
RESONATOR
U206
SHIELD
SH251
1
33
R261
12
R263
270
CR251
C287
100pF
1.8pF
C265
68pF
C281
1.9 V when selected
0.1uF
C270
C285
0.1uF
2
1
R266
30K
L257
21
220nH
C289
.033uF
33
R272
22K
R268
Tx_sw
Allows 3V logic from frac-N to control 5V logic of VCO
0V for RX
5V for TX
VCO Select Line
LEVEL SHIFT FOR VCO SELECT
C263
68pF
R257
21
1K
2
4
1
47K
47K
10K
4.7K
3
Q252
AUX4_1_VCO
AUX4
AUX3_5V_1_VCO
AUX3_5V
5V when selected
5 mA current draw
C290
56pF
C284
56pF
C286
68pF
120
R274
2
1
270
R250
1
3
2
BFQ67W
Q251
68pF
C257
220nH
2
1
L252
R253
10
C283
0.5pF
NU
L265
47nH
C256
1pF
33
L250
R271
6.8nH
R251
2
1
100
47K
R254
6 dBm typical
to PA
TX_INJ_1_VCO
TX_INJ
15nH
L264
TX BUFFER
Figure 9-263. 800 MHz Voltage Controlled Oscillator Schematic Diagram

Motorola HT Series Specifications

General

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