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T-990D
1018:
MC1495L
(X05-3420-11)
MPX
SUB demodulator
MPX
SUB
Decoder (IC18:
MC1495L)
The Direct Pure MPX
enables stereo decoding
without
causing beat interference, in theory, by linear-multiplying
two analog signals (stereo composite signal and 38 kHzsine
wave sub carrier signal).
This unit provides the linear multiplier with high S/N ratio,
which is designed with the new theory. so that the high
signal-to-noise rationof 94 dB for the MPX unit itself and
the resistance to overmodulation of 400% (dynamic range:
106 dB are realized while the conventinal characteristics
are maintained.
Internal equivalent circuit
O 2 Output
O 14
(KXY)
38kHz
8 Oo
X Input
Y Input
4
O 12 Composite
50
O11
60
O10
30
O13
v
7
1C22: M5231TL (X05-3420-11)
Constant voltage power supply
Block diagram
INPUT
CIRCUIT
OVERHEAT
= Cy
PROTECTION
OVER-WAVE
OUTPUT
LIMITER
VOLTAGE ADJUSTMENT
16
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