LA1193M(1997) Просмотр технического описания (PDF) - SANYO -> Panasonic
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LA1193M Datasheet PDF : 21 Pages
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LA1193M, 1193V
3D-AGC Features
Feature
The narrow AGC sensitivity, which operates for ∆f of less than 1.5 MHz, is
controlled independently according to the field strength of the desired
station.
The narrow AGC sensitivity is controlled at V20 values under 2 V.
The wide AGC operates even when V20 is zero, i.e., when the desired
station does not exist.
The N-AGC and the W-AGC sensitivities can be set independently.
The system has two AGC systems, the N-AGC and the W-AGC.
Merit
• This is effective as a measure for mitigating two signal sensitivity
suppression.
• This allows two signal sensitivity suppression to be mitigated without
deterioration in the three signal characteristics.
• This allows the prevention of incorrect stopping on intermodulation
signals during search.
• This allows the prevention of intermodulation occurring in the antenna
and RF modulation circuits in the presence of strong interfering stations.
Prevention of blocking oscillation due to AGC operation is also possible.
• This allows optimal settings to match the reception field conditions.
• Since the narrow AGC operates at the desired station and at adjacent
stations, it is possible to reduce the wide AGC sensitivity. This prevents
incorrect AGC operation due to local oscillator injection.
3D-AGC Sensitivity, ∆f and V20 Characteristics
Figure 3 3D-AGC Sensitivity, ∆f and V20 Characteristics
— The W-AGC sensitivity is determined by the antenna RF circuit selectivity independently of V20.
— The N-AGC sensitivity is determined by the antenna, RF and mixer circuit total selectivity when V20 is 0.6 V
or greater. It is determined by that selectivity and V20 when V20 is over 0.6 V.
— The improvement in two-signal sensitivity suppression is the shaded area in the total AGC sensitivity and
corresponds to the section occupied by the N-AGC.
No. 4715-10/21
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