Figure 9-249.Low Band (29.7-42/35-50 Mhz) Frequency Generation Unit - Motorola HT Series Detailed Service Manual

9-402
CR204
AUX3
0.15 Vdc RX
3.25 Vdc TX
AUX2
3.23 Vdc RX
CR203
0 Vdc TX
L201
VCTRL
1.35uH
C201
1000pF
CR201
L207
4.8uH
C214
.01uF
U203
Figure 9-249. Low Band (29.7-42/35-50 MHz) Frequency Generation Unit VCO Diagram
0 Vdc TX
U207
4.45 Vdc RX
4.56 Vdc
0 Vdc RX
4.52 Vdc TX
C219
.01uF
RX VCO
C202
CR202 47pF
C203
TR201
C220
RESONATOR
50-300MHz 22pF
6.8pF
L203
1.35uH
C222
.01uF
C225
.01uF
68
R231
TX_VCO
-16 dBm RX
0 dbm TX
D
C215 C216
Q203
82pF 30pF
30K
L208 R232 S
270nH
R206
56
L209
270nH
VSF
R203 C218
100 .01uF
L202
C227
1.35uH
.01uF
D
R204
Q204
180
D
+11 dBm RX
S
-7 dBm Tx
Q202
C224
S
2pF
C223
L210
5.1pF
1.35uH
R236
R233
56
2.2K
0.8 Vdc
R235
820
C226
16pF
SH202 SH203
SHIELD SHIELD
VCO BOTTOM VCO TOP
RECEIVE -47dBm SIGNAL AT 35.04MHz WITH 1KHz TONE.
RF MEASUREMENTS MADE WITH BOONTON 92 MILLIVOLTMETER.
Low Band Circuit Board/Schematic Diagrams and Parts List
R234
1K
2.9 Vdc
+7 dBm TX
C228
+15.25 dBm RX
Q201
10pF
L215 C229
5.45nH 82pF
L212
120nH
R237
3.9
L204 L211
+6 dBm
620nH 330nH
C230 C231
36pF 56pF
R1 29.7 - 42 MHz
Designator Part Number Value
L208 2462587T20 270 nH
L209 2462587T20 270 nH
C215 2113740L40 82 pF
C202
2113743N42 47 pF
C203 2113743N34 22 pF
L207 2405452C27 4.8 uH
C297
PRE_IN
-14dBm RX
.01uF
-12dBm TX
R238
1K
RX_INJ
+4dBm RX
C235 -16dBm TX
56pF
C221
TX_INJ
.01uF +4dBm TX
-22dBm RX
R2 35 - 50 MHz
Part Number Value
2462587T19 220 nH
2462587T19 220 nH
2113740L38 68 pF
2113743N40 39 pF
2113743N32 18 pF
2405452C63 1.35 uH
FL0830469O