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KT-1100D
MPX SUB Decoder (IC8: MC1495L)
The Direct Pure MPX enables stereo decoding without caus-
ing beat interference, in theory, by linear-multiplying two an-
alog signals (stereo composite signal and 38 kHz sine wave
sub carrier signal).
This unit provides the linear multiplier with high S/N ratio,
Non-Stable Multi-Vibrator for Peak Hold and Reset
Since the BAG68A
deviation meter drive IC provides the
peak-hold function as well as the reset pin, when random
pulses are applied, a simple peak hold meter will be con-
+B
which is designed with the new theory, so that the high sig-
nal-to-noise ratio of 94 dB for the MPX unit itself and the re-
sistance to overmodulation of 400% (dynamic range:
106
dB) are realized while the conventional characteristics are
maintained.
QO 2
Output
O 14 (KXY)
X Input
12
Composite
Fig. 5 MC1495L Internal equivalent circuit
structed.
For this purpose, this circuit is used as the multi-
vibrator consisting of two NOR gates (C-MOS) and oscillates
by the mechanism as follows:
omaSLtL
&
C10
3/4
Topin @}
C14 10425
Fig. 7 1C10: .PD4001BC
Output (©) | |
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250uS
Fig. 6
While two inputs of the first NOR gate are short-circuited,
one end of the second NOR gate is grounded.
This is be-
cause the threshold values of two gates are set differently to
prevent the circuit from entering non-oscillation/stable state
at the power ON/OFF timing.
1C3 BA668A
©
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