User Manual Part 3

8-13
PLL
0603 0603
0603
0603
VCO1
SPI_CLK
PLL2_CS
TX_MOD2
TX_MOD2
SPI_MOSI
TX_PLL_LOCK
TX_LO
T/nR
T/nR
TX_RF
+5.5V
+3.3V
+3.3V
+5VA
+5VA
+3.3VXR
FB9
FB
12
C25
3300pf
+
C310
1uf
C295
3300pf
L77
72nH
TP27
L35
39nH
C296
3300pf
C306
.0068uf
R113
1K
C275
1.0uf
R122
430
C303
10pf
R123
2K
C307
1000pf
R114 330
FB10
FB
12
U47
VCO-D16
1
2
3
4
RF_o
V
IN
G
R117
1K
C305
100pf
C312
3.3pf
Y2
VTX822015C-16.8-5.0
4
3
1
2
5
cc
V
Out
Vtune
dnG
G
C300
3300pf
C294
470pf
C311
4700pf
R116
NP
R118
10
R110
240K
C299
100pf
C30
.22uf
C301
1000pF
C304
.1uF
R112 330
+ C290
4.7uf
C298
47pf
C288
.1uF
R23
51
+
C286
4.7uf
U18
MAX2661
1
2
6
5
34
LO
GND
nSHDN
VCC
IFIN RFOUT
+
C284
10uf
R111
330
+
C289
4.7uf
R121
430
TP28
C292
100pf
C297
1000pf
C291
.1uF
R119
100
C272
3.3pf
L78
72nH
C309
.022uf
R70
51
C313
3.3pf
C27
3.3pf
R115
330
L81
330nH
U45
LT1761ES5-5
15
42
3
IN OUT
BYPGND
nSHTDN
C308
.027uf
FB8
FB
12
+
C302
4.7uf
R15
51
C274
10pf
R109
160
C287
100pf
C273
3.3pf
+
C293
4.7uF
U46
CX72301
1
2
3
4
5
6
7
8
9
10
11
12
13
14 15
16
17
18
19
20
21
22
23
24
25
62
27
28
CLK
MOD_IN
MUXOUT
VSUBD
GNDcm
mcCCV
FVCO
nFVCO
LD/PS
VCCcp
CPOUT
GNDcp
XTALG
XTALIN XTALO
VCCx
GNDx
LD/PSa
VCCca
CPout
GNDcp
nFVCOa
FVCOa
VCCcm
GNDd
dCCV
DATA
nCS
C285
.1uF
N
OTE: Individual replacement parts are not available for the
R
F board, so the entire board must be replaced if it is defective.
VHF RF BOARD SCHEMATIC (PAGE 6 OF 6)