Motorola HT Series User Manual

9-478 900 MHz Circuit Board/Schematic Diagrams and Parts List (PCB 8471203M01)
TX BUFFER
5 mA current draw
5V when selected
R251
100
56pF
C286
R271
33
47pF
C290
6.8pF
R274
120
C256
10
R253
C293
0.1uF
4.7nH
L250
100nH
L252
2
Q251
BFQ67W
1
3
R254
47K
L265
47nH
C254
56pF
47pF
C284
1pF
C283
8.2nH
L264
R250
270
to PA
0V for RX
5V for TX
VCO Select Line
6 dBm typical
56pF
C257
TX_INJ_1_VCO
AUX3_5V
TX_INJ
1K
R257
AUX3_5V_1_VCO
Allows 3V logic from frac-N to control 5V logic of VCO
LEVEL SHIFT FOR VCO SELECT
AUX4
Q252
2
43
C263
56pF
AUX4_1_VCO
1
47K
47K
10K
4.7K
1.225 GHz
TX VCO Components
Freq Range
896 to 941 MHz
270
R263
100nH
L256
33
R261
NU C272
0.5pF
100pF
C287
NU
C276
4.3pF
3.6pF
C277
L266
100nH
NU
C268
1pF
2pF
C265
FL252
RESONATOR
56pF
C281
L261
15nH
CR251
1.9 V when selected
C294
C270
0.1uF
56pF
L257
100nH
R268
22K
.033uF
C289
0.1uF
C285
33
R272
27K
R266
5.6pF
C271
Tx_sw
OPTIONAL BIAS TUNING VOLTAGE
L263
22nH
NU
C282
68pF
C279
2.7pF
CR252
CR253
L262
100nH
C278
3pF
NU
Freq Range
825 to 831 MHz
920 MHz
1.9 V when selected
18K
R265
C269
.033uF
R262
33
L258
100nH
12K
R267
68pF
C295
C273
3pF
C275
0.75pF
2pF
C266
33
R270
0.1uF
C258
C267
2pF
L259
21
100nH
270
R264
21
26C23
FL251
Rx_sw
Steering Line
2 to 11 VDC
VCTRL_1_VCO
VCTRL
VCO TOP SHIELD
VCO TOP SHIELD
VCO BOTTOM SHIELD
SH251
SHIELD
SH250
SHIELD
SHIELD
SH252
Switched supplies for VCOs
on this page
PRESC
7
10
13
12
8
PRESC_1_VCO
Rx_sw
Tx_sw
14
SREFFUB_CCV
18
CIGOL_CCV
RX_SWITCH
3
SUPER_FLTR
19
TRB_IN
16
TX_BASE
15
TX_EMITTER
1
TX_IADJTX_OUT
TX_SWITCH
11
S
REFFUB_DNG
9
GALF_DNG
C
IGO
L
_
D
N
G
17
PRESC_OUT
5
RX_BASE
6
RX_EMITTER
2
RX_IADJRX_OUT
50U54
U250
4
COLL_RFIN
20
FLIP_IN
R273
33
C280
0.1uF
001
6
2
L
56pF
C274
Supply from U201
4.6 V Super Filter
3
52C
F
p
8
6
0.1uF
C252
C291
56pF
C260
NU
56pF
Q253
0.1uF
C262
56pF
C292
33nH
L254
C261
68pF
VSF
C250
0.1uF
Hn
0
C251
56pF
VSF_1_VCO
R275
10
0.1uF
C264
C259
2.2uF
0 dBm to RX_FE
R281
0
43
NU
43
NU
R282R280
R255
330
L253
390nH
RX_LO
RX_LO_1_VCO
0.5pF
NU
C255
DACRX_2_VCO
RESET
RESET_1_VCO
DACRX_1_VCO
UNSWB+
UNSWB+_2_VCOUNSWB+_1_VCO
CLK_2_VCO
DATA_2_VCO
DACRX
CLK
DATA_1_VCO
RESET_2_VCO
CSX_1_VCO
CSX_2_VCO
CLK_1_VCO
DATA
CSX
RX VCO Components
Figure 9-283. 900 MHz Voltage Controlled Oscillator Schematic Diagram

Motorola HT Series Specifications

General

Battery Type	Li-Ion
Waterproof	IP54
Operating Temperature	-30°C to +60°C
Frequency Range	VHF: 136-174 MHz
Number of Channels	16