Figure 9-246.Low Band (29.7-42/35-50 Mhz) Receiver Front End - Motorola HT Series Detailed Service Manual

Low Band Circuit Board/Schematic Diagrams and Parts List
RX_IN
R503
C533
C504 1K
-24.5 dBm
2
0.78 Vdc
K
39pF 51pF
R512
4.7K
L501
C538 L502 D502
150nH 82pF 270nH
C535 C537
2pF 3.9pF
L504
R504 L503
560nH
1uH
12K
C536
C534
8.2pF 27pF
C506
100pF
3.24 Vdc
Q509
HP415
SH501 SH502
SHIELD SHIELD
33 mV
R513
10
MIXER
LP FILTER
RECEIVE -47dBm SIGNAL AT 35.04MHz WITH 1K TONE.
RF MEASUREMENTS MADE WITH BOONTON 92 MILLIVOLTMETER.
R5
C507 R505
0.1uF 560
L508
68nH
T501
XFMR
3.25 Vdc
6 1
2
C522
L507
4 3
150nH
-24.5 dBm
.01uF
C515
56pF
SH500
SHIELD
RX_INJ
PREAMP
TP500
-18.75 dBm
Figure 9-246. Low Band (29.7-42/35-50 MHz) Receiver Front End Schematic Diagram
9-399
C516
30pF
R509
R507
270
270
R508
IF
18
-26.5 dBm
4 3
D501
2 1
1 2 3
T502
XFMR
4
6
R510
3.6K
FL0830471O