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Transmitter RF PCBA Block Diagrams (90341, 90343,
90347)
Figure 3-3 90343-16 wideband VHF transmitter RF PCBA
JP3
JP2
ECG/SPO2
mux
buffer
PWM
comparator
PWM
data
formatter
PWM
filter
PWM
ramp
generator
PWM
PAL
VCXO
first
frequency
doubler
clock
generator
second
frequency
doubler
RF out
pacer flag
RA ON
RL ON
C ON
LL ON
LA ON
status data
control
status
mux
ID0-7
ID8-15
switch
bank 1
switch
bank 2
low
battery
detector
record
switch
control
II
V
2
3
4
5
control
lead
to RA
6
1
2
3
4
5
I
III
JP4
1
SPO2
32 KHz
202.6875 MHz to
205.0875 MHz
101.34375 MHz
to
102.54875 MHz
50.671875 MHz
to
51.271875 MHz
8 kHz
power
supply
9 V battery