Schematics, Board Overlays, and Parts Lists – UHF
: Transceiver (RF) Section
9-11
6871620L01-C
May 28, 2008
Figure 9-10. UHF Frequency Generation Unit (TX VCO) Circuit – 2 of 3
TX
VCO
VCTRL
VSF_VCO
AUX3
2113946B04
C292
0
.
1uF
100pF
C294
4815055H01
Q273
47K
10K
47K
4
.
7K
UMC5NT2G
C279
0
.
1uF
2113946B04
2113944A43
180pF
C280
0613952Q95
R270
8
.
2K
D273
4815002H01
R271
9
.
1K
0613952Q96
D274
4815002H01
C273
680nH
2416307H01
L274
D272
4815002H01
1
.
5pF
2113944A05
L275
2416307H01
680nH
2416307H01
680nH
L270
2113944A43
C278
180pF
36nH
2415427H37
L271
C274
2113944A25
10pF
2113944A43
C281
180pF
D271
4815002H01
4871915M01
Q271
I
DCTR
L272
2471911M01
8
.
9nH
7
.
5pF
C272
2113944A22
C271
2113944A22
7
.
5pF
2416307H01
L273
680nH
100
0613952Q49
R284
12pF
2113944A26
C275
82pF
2113944A38
C277
2113944A24
C276
9
.
1pF
1
.
5pF
R272
100
0613952Q49
C285
2113944A05
180pF
C284
2113944A43
0613952Q67
R286
560
C283
0
.
1uF
2113946B04
C282
2
.
0pF
2113944A08
NP
2113944A43
C286
180pF
680nH
2416307H01
L276
56
R277
200
0613952Q56
R280
0662057M44
2113944A43
C287
C288
1
.
5pF
180pF
2113944A05
R279
0613952Q91
5
.
6K
4885061Y01
Q272
0613952Q95
R278
8
.
2K
2415427H41
L278
47nH
C293
3
.
0pF
2113944A12
Tx_VCO_Out
TXRF
PRES_RX_
I
N
TEST_PO
I
NT
TP203
1
R266
200
PRESC
C291
100pF
51
R265
0613952Q42
2113944A40
C290
2113944A27
15pF
2415429H12
8
.
2nH
L277
2113944A32
C289
39pF
Summary of Contents for ASTRO XTSTM 4000
Page 1: ...COLOR CHORDS 7 ASTRO XTSTM 4000 Portable Radio Detailed Service Manual ...
Page 2: ......
Page 16: ...May 28 2008 6871620L01 C xiv Commercial Warranty Notes ...
Page 22: ...May 28 2008 6871620L01 C 1 6 Introduction Notes ...
Page 26: ...May 28 2008 6871620L01 C 2 4 Radio Power Notes ...
Page 56: ...May 28 2008 6871620L01 C 3 30 Theory of Operation Notes ...
Page 100: ...May 28 2008 6871620L01 C 6 8 Troubleshooting Waveforms Notes ...
Page 194: ...May 28 2008 6871620L01 C B 2 Motorola Service Centers Notes ...
Page 204: ...May 28 2008 6871620L01 C Glossary 10 Glossary Notes ...
Page 209: ......