TxB+
SWB+/B+
TxKEY
BEC
MIC+
SPEECH3V
IC6
TR319
REG
TR44
TR23
BEC.EN
SQB+
SW3V
TxREG
TR20/IC1
1V REG
1V
Tx DRIVERS
& PA
PL301
13
7
12
1
8
9
SK301
3
TR15/TR16
Tx SPEECH
SUB-AUDIO
TAG10668-1
R338
R344
RPR 561
TM1200 Issue 1
Page 3 - 3
Figure 1: Radio Board - Power Supply Distribution
RADIO BOARD
Power Supplies
7.
Battery Voltage (B+), TxB+, SPEECH3V and the +4.5V supply lines are derived from
the Decoder Board and are available at PL301.
8.
Receiver IF Amplifier IC1 is gated on and off by the Battery Economy Circuit (BEC) line
from the Gate Array on the Decoder Board (via PL301 pin 12). This can be overridden
for manual tests by taking /BEC.EN low. When gated on, TR23 conducts providing
power to pin 20 of IC1, which drives an internal voltage regulator. This in turn is applied
to TR20 to provide a 1V regulated supply rail which powers most of the receiver.
9.
The transmitter oscillator and exciter circuits are powered from the TxREG line, an on-
board 2.5V regulated supply derived from IC6, which in turn is powered from the B+
line. The second driver, intermediate power amplifier and power amplifier are powered
from the B+ supply which is gated via TR319 and the /TxKEY line.
Содержание RPR 561
Страница 40: ...RPR 561 TM1200 Issue 1 Page 3 5 Figure 2 Radio Board Receiver Block Diagram...
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Страница 106: ...TM1200 Issue 1 AL1 April 1999 Figure 8 Decoder 0201 0874 Circuit Diagram Sheet 1 of 2 Page 7 17 18...
Страница 107: ...TM1200 Issue 1 AL1 April 1999 Figure 9 Decoder 0201 0874 Circuit Diagram Sheet 2 of 2 Page 7 19 20...
Страница 108: ...TM1200 Issue 1 Figure 10 Decoder Component Location Side 1 Page 7 21 22...
Страница 109: ...TM1200 Issue 1 AL1 April 1999 Figure 11 Decoder 0201 0874 Circuit Diagram Sheet 2 of 2 Page 7 23...