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US 5,345,604 AGranted
FM vehicle radio with modular phase shifters
AssigneeBlaupunkt-Werke GmbH
InventorKurt Wiedemann
Life of this patent
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Abstract
A modularly-designed FM vehicle radio for operation in connection with a plurality of antennas is disclosed, where the summing circuit consists of a series connection of the secondary coils of the output transformers of the input stages.
Claims5
An FM vehicle radio for operation in connection with a plurality of antennas disposed in different locations of the vehicle, reception signals of which, converted to an intermediate frequency range, are summed in a summing circuit after control phase shifting and are subsequently demodulated,
- wherein
- a plurality of signal input modules (8) are provided, each including a transformer (4) having a primary coil (7) and a secondary coil (3);
- the secondary coils (3) of said transformers (4) form respective outputs of the plurality of modules (8) and said outputs are connected in series in the summing circuit,
- the terminals of each secondary coil (3, 3') are connected via a plug connection (5, 5') to an input signal path of an amplifier (1, 2), and
- a respective resistor (6) is connected in said input signal path between terminals of each of said plug connections (5, 5').
2 more elements
A mobile diversity radio receiver, comprising:
- an amplifier (1) having a signal input path;
- a field effect transistor (2) connected in said signal input path of said amplifier;
- a plurality of resistors (6, 6') connected in series between ground and a base terminal of said field effect transistor (2);
- a respective two-wire plug connection terminal (5, 5') bridging each of said plurality of resistors (6, 6');
- and
- a respective phase-matching signal input module (8) engageable with each of said plug connection terminals (5, 5'),
- each module (8) having
- an input stage (9, 9') adapted for connection to an antenna;
- at least one current source (11) having an input connected to an output of said input stage (9, 9');
- and
- a bandpass filter (7, 10) having input lines connected to said at least one current source (11) and output lines furnishing output signals of said module at said plug connection terminals,
- whereby at least one module (8) can be disengaged from said receiver while said receiver continues to operate.
9 more elements
Dependencies are inferred from the claim text.