Figure 8-58. Nle 4273A Uhf Range 2 Frequency Generation Unit (Vco) Circuit Schematic - Motorola ASTRO XTS 5000 Detailed Service Manual

8-88
C301
L301
390nH
3.9pF
2 2
D301 D302
1 1
C302
L302
VCTRL
390nH
3.9pF
1 1
D303 D304
1SV279
2 2
AUX4
AUX1
C321
L305
390nH
2.4pF
2 2
D309 D310
1 1
C322
L306
390nH
2.4pF
1 1
D311 D312
1SV279
2 2
AUX2
C330
L307
390nH
2pF
2 2
D313 D314
1 1
C331
L308
390nH
2pF
1 1
D315 D316
1SV279
2 2
AUX3

Figure 8-58. NLE 4273A UHF Range 2 Frequency Generation Unit (VCO) Circuit Schematic

July 21, 2004
VSF
TX1 VCO
R301
30K
C303
Q304
NE68519
1.5pF
C304
2.2pF
L309
R303
R302 L315
14.64nH
22K
R304
390nH
220
22
C306
3.9pF
R305
51K
TX2 VCO
VSF
RX1 VCO
R317
30K
C323
Q302
NE68519
1.8pF
C324
L313
31.67nH 3.3pF
R319
R318 L317
22K
R320
390nH
220
22
C328
8.2pF
G
R322
51K
VSF
RX2 VCO
R323
30K
C332
Q301
NE68519
1.8pF
L320 C333
3.3pF
25.19nH R325
R324 L318
22K
R326
390nH
220
22
D
C335
8.2pF G
S
R327
51K
TX1EN
D
C307
G 120pF
Q308
TN0200T
S
VSF
C316 R312
120pF 33
VSF
10K
22K
10K
22K
RX1EN Q311
D
C329
120pF
Q306
S
TN0200T
RX2EN
C336
120pF
Q305
TN0200T
MAEPF-27973-O
Schematics, Board Overlays, and Parts Lists: Transceiver (RF) Boards
VSF
R333
220
C308 L310
22pF 22nH
C309
56pF
C340
5.6pF
VSF
VSF
C313
C317
0.1uF
120pF
14 18
L312
390nH
1 10
C318
TX_IADJ TX_OUT
L321
2 8
RX_IADJ RX_OUT
3 82nH
SUPER_FLTR
120pF
4 12
COLL_RFIN
PRESC_OUT
5 U300
L316
RX_BASE
50U54 10nH
6 7
RX_EMITTER RX_SWITCH
16 13
TX_BASE TX_SWITCH
15
TX_EMITTER
20
FLIP_IN
19
C326
TRB_IN
120pF
9 11 17
Q310
R332
5.6K
L303 R306
TXRF_OUT
18nH
10
R307
R308
330 330
R314
RXLO_OUT
22
C341
R315
15pF
56
C327
L314
PRESC
68nH
120pF
R321
330
6881094C31-D