Alstom SHPM 101 - A-G Polarising Mixing Circuit; B-C Polarising Mixing Circuit

SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Appendix A
Page 39 of 71
PARTIALLY CROSS-POLARISED SIGNAL
V
QBC
= V
B
– V
C
+ 0.16V
NA
E
R11
V
NA
= (V
A
+ 0.16V
KA
) ∠–90°
V
KA
V
A
V
B
V
C
R6
R5
R12
R10
R9
IC2
IC3
V
NA
0.16V
KA
90°
V
A
V
B
– V
C
+
–
+
–
–90°
E
R4
R3
R2
R1
R6
R5
E
ICI
+
–
+
–
V
MA
V
B
V
C
V
A
V
KA
= (V
B
+ V
C
) + 0.16V
MA
PARTIALLY CROSS-POLARISED SIGNAL
V
QA
= V
A
+ 0.16V
KA
–(V
B
+ V
C
)
V
B
+ V
C
V
B
V
C
0.16V
MA
Figure 40: B–C polarising mixing circuit
Figure 39: A–G polarising mixing circuit