Hitachi EC702HP Operation Manual page 18

Analog Board Analog Board
Up-Converter Up-Converter
SPI_LO SPI_LO
IF I LPF LPF
IF I
LPF LPF
IF Q IF Q
Down-Converter Down-Converter
Voltage Voltage
Before Filter in Variable Variable
Before Filter in
Attenuator Attenuator
Voltage Voltage
After Filter in
After Filter in
Variable Variable
Attenuator Attenuator
10MHz lo 10MHz lo
SPI_LO SPI_LO
Local Local
LO_Q LO_Q
Oscillator Oscillator
LO LO
Null Null
LO_I LO_I
DAC DAC
2xLO 2xLO
I+ I+
Balance Balance
UP-Converter
UP-Converter
I- I-
Active Active
Mixer Mixer
Q+ Q+
Balance Balance
Q- Q-
+28V +28V
RF Mute RF Mute
Reflected Reflected
LO LO
RF RF PAD PAD Passive Passive PAD PAD
Down-Converter Down-Converter
Sw itch Sw itch 2dB 2dB Mixer Mixer
1:3 1:3
B B
PAD PAD
d d
8 8
1 1
Figure 1-6
2nd Part - Block Diagram: Exciter
Loc k_D etect 2 Loc k_D etect 2
LO LO
Test_Point_4 Test_Point_4
ALC ALC
Voltage-Controlled Voltage-Controlled
2 2 Harmonic Harmonic
nd nd
Variable Gain Variable Gain
Filter Filter
Amplifier Amplifier
S S n n
electio electio
VGA VGA
Level Level
Detector Detector
1 1 1 1
d d 7 7 d d 7 7
LPF LPF
2dB 2dB
B B B B
6dB 6dB
CH out
CH out
Feedback Feedback
Test_Point_5
Test_Point_5