FIELD: radio engineering, communication.
SUBSTANCE: present invention relates to radio engineering and can be used in designing input circuits of software-defined radio receivers. A controlled preselector integrated with a magnetic ferrite antenna comprises a ferrite rod, two coils placed at the ends of the ferrite rod, first and second variable capacitors, a tuning control circuit, a matching transformer, a preamplifier and two additional inductance coils. The disclosed controlled preselector provides bandwidth consistency with variation of the tuning frequency thereof, identical input resistances at both the inverting and non-inverting inputs and is characterised by low input resistance.
EFFECT: providing the best matching with low-impedance series circuits of a ferrite antenna.
3 cl, 3 dwg
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| MAGNETIC ANTENNA | 1995 |
|
RU2099830C1 |
