Motorola MTR2000 T5544 Instruction / Field Service Manual page 178

100 W INPUT BOARD
14.2 Vdc
VOLTAGE
TRANSLATOR
SPI BUS (CLOCK & DATA)
SPI BUS
TO/FROM SCM
(VIA BACKPLANE)
+14.2 Vdc
SOURCE
+14.2 Vdc FROM +5 V +5 Vdc
POWER SUPPLY REGULATOR SOURCE
+28.6 Vdc FROM
+28.6 Vdc
POWER SUPPLY
SOURCE
28.6 Vdc
FINAL MODULE
V_OMNI
V_CNTL
PA DA CS*
PA AD CS*
DIRECTIONAL COUPLER/LOW PASS FILTER
CIRCULATOR
DIRECTIONAL
COUPLER
LOW PASS
FILTER
50 OHM
LOAD
100 W OUTPUT BOARD
FINAL CURRENT
I LIMIT SET
D/A
CONVERTER
ID
FAN ENABLE2
14.2 Vdc
CHIP
SELECT
FAN
ENABLE/
FAN ENABLE1
SUPPLY
T°
PA TEMP
VHF 100 W Power Amplifier Module
SPI BUS (CLOCK & DATA)
V_OMNI
V_RFLD
V_FWD
V_CNTL
Σ
PWR SET
PA ID A
PA ID
CIRCUIT PA ID B
FAN SUPPLY
FAN VOLTAGE
PA TEMP
DC FAN
Figure 1. VHF 100 W Power Amplifiers
68P81096E24-C
06/30/06
A/D
CONVERTER
CHIP
SELECT
Functional Block Diagram
5