Motorola MTR2000 Manual page 66

PA ENABLE
30/40 W INPUT BOARD
MODULATED RF
FROM EXCITER
MODULE
14.2 Vdc
VOLTAGE
TRANSLATOR
SPI BUS
SPI BUS (CLOCK & DATA)
TO/FROM SCM
(VIA BACKPLANE)
D/A AND A/D
CHIP
SELECTS
FROM SCM
+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
14.2 Vdc
INTERMEDIATE
BUTTERFLY
POWER AMPLIFIER
MODULE
(IPA)
0 to 10 W
V_OMNI
V_CNTL
PA DA CS*
PA AD CS*
Butterfly Module
Coupler/LPF
Input Board
Output Board
Circulator
CIRCULATOR * CIRCULATOR *
* TTD1921
ONLY
DIRECTIONAL COUPLER/LOW PASS FILTER
50 OHM 50 OHM
LOAD LOAD
LOW PASS
FILTER
** TTD1781
ONLY
LOW PASS
FILTER **
30/40 W OUTPUT BOARD
I LIMIT SET
D/A
CONVERTER
ID
CHIP
SELECT
T°
PA TEMP
30/40W PA MODULE
MODEL TTD1921A/TTD1781A
TTD1781 TTD1921
40 W 30 W
IPA TLD9820
TTD6370
TFD6560
TTD6470
TTD6451 TTD6481
5884911T20
DIRECTIONAL
COUPLER
FINAL CURRENT
Σ
PWR SET
PA ID
CIRCUIT
30/40W PA FUNCTIONAL BLOCK DIAGRAM
TRANSMIT RF OUTPUT
TO TRANSMIT ANTENNA
SPI BUS (CLOCK & DATA)
V_OMNI
V_RFLD
V_FWD
V_CNTL
A/D
CONVERTER
PA ID A
PA ID B
PA TEMP
CHIP
SELECT
68P81094E14-C
Functional B D (Sheet 1 of 18)
03/26/99