Lowband 29-42/35-50Mhz Voltage Controlled Oscillator Schematic Diagram - Motorola GP328 Detailed Service Manual

6E-20
CR204
AUX3
0.15 Vdc RX
3.25 Vdc TX
AUX2
3.23 Vdc RX
CR203
0 Vdc TX
VCTRL
C201
1000pF
L207
4.8uH
C214
.01uF

Lowband 29-42/35-50MHz Voltage Controlled Oscillator Schematic Diagram

0 Vdc TX
U207
4.45 Vdc RX
4.56 Vdc
0 Vdc RX
4.52 Vdc TX
RX VCO
C202
L201
1.35uH
CR202 47pF
C203
TR201
CR201 RESONATOR
50-300MHz 22pF
L203
1.35uH
TX_VCO
C215 C216
82pF 30pF
30K
L208 R232
270nH
U203
R206
56
L209
270nH
VSF
C218
R203
100 .01uF
L202 C227
1.35uH
.01uF
C219
D
.01uF
Q204
D
+11 dBm RX
S
-7 dBm Tx
Q202
C224
S
C220 2pF
6.8pF
C223
L210
5.1pF
1.35uH
C222
R236
56
.01uF
0.8 Vdc
R235
820
C225
.01uF
68
R231
C226
-16 dBm RX
16pF
0 dbm TX
D
Q203
SH202
SHIELD
S
VCO BOTTOM
RECEIVE -47dBm SIGNAL AT 35.04MHz WITH 1KHz TONE.
RF MEASUREMENTS MADE WITH BOONTON 92 MILLIVOLTMETER.
Circuit Board/Schematic Diagrams and Parts List
R204
180
R234
1K
R233
2.2K
2.9 Vdc
+7 dBm TX
C228
+15.25 dBm RX
Q201
10pF
L215
5.45nH
L212
120nH
R237
3.9
L204
+6 dBm
620nH
C230 C231
56pF
36pF
SH203
SHIELD
R1 29.7 - 42 MHz
Designator Part Number Value
L208 2462587T20 270 nH
VCO TOP
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
-16dBm TX
C235
C229
56pF
82pF
C221
L211
TX_INJ
330nH
.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