Radio transceiver

Claim 2

A radio transceiver apparatus, comprising: a transmitter for transmitting modulated radio signals; a receiver for receiving modulated radio signals; an antenna connected to the transmitter for radiating modulated radio signals coupled from the transmitter and connected to the receiver through a reactive portion of the transmitter for coupling received modulated radio signals to the receiver; and switching means connected to the transmitter and to the receiver and selectively operable for open circuiting the transmitter thereby to disable the transmitter and effectively connect the antenna through the reactive portion of the transmitter to the receiver, and for short circuiting the receiver thereby to disable the receiver and effectively connect the antenna to the transmitter.

Claim 3

A radio transceiver apparatus, comprising: a transmitter having an output circuit for transmitting signal information; a receiver having an input circuit for receiving signal information; an antenna connected to the output circuit of the transmitter for transmitting signal information transferred to the antenna from the output circuit, and connected to the input circuit of the receiver through a capacitive portion of the output circuit of the transmitter for transferring signal information received by the antenna to the input circuit; switching means having a conductive condition and a nonconductive condition connected in series with the output circuit of the transmitter and in parallel across the input circuit of the receiver, so that in the conductive condition the switching means enables the output circuit of the transmitter to transmit signal information to the antenna by short circuiting the input circuit of the receiver to disable the receiver, and so that in the nonconductive condition the switching means enables the input circuit of the receiver to receive signal information from the antenna through the capacitive portion of the output circuit of the transmitter by open circuiting the output circuit of the transmitter to disable the transmitter.

Claim 4

A radio transceiver apparatus, comprising: a transmitter having an output circuit for transmitting signal information; a receiver having an input circuit for receiving signal information; an antenna connected to the output circuit of the transmitter for transmitting signal information transferred to the antenna from the output circuit, and connected to the input circuit of the receiver through a capacitive portion of the output circuit of the transmitter for transferring signal information received by the antenna to the input circuit; switching means having a conductive condition and a nonconductive condition connected in series with the output circuit of the transmitter and in parallel across the input circuit of the receiver, so that in the conductive condition the switching means enables the output circuit of the transmitter to transmit signal information to the antenna by short circuiting the input circuit of the receiver to disable the receiver, and so that in the nonconductive condition the switching means enables the input circuit of the receiver to receive signal information from the antenna through the capacitive portion of the output circuit of the transmitter by open circuiting the output circuit of the transmitter to disable the transmitter.

Claim 5

A radio transceiver apparatus, comprising: a transmitter including an oscillator for producing a radio frequency carrier signal which is modulated by an audiofrequency intelligence signal applied to the oscillator, the oscillator including a tuned circuit for determining the frequency of the radio frequency carrier signal; a receiver including an input transformer having a primary winding connected in series with the tuned circuit of the oscillator; an antenna connected to the oscillator for radiating modulated radio signals developed by the transmitter and coupled to the antenna, and connected to the primary winding of the input transformer through a portion of the tuned circuit of the oscillator for coupling modulated radio signals received by the antenna to the primary winding of the input transformer; and switching means connected within the tuned circuit of the oscillator for disabling the transmitter by open circuiting the tuned circuit when the switching means is opened thereby to effectively connect the antenna through the portion of the tuned circuit to the primary winding of the input transformer, and the switching means also connected across the primary winding of the input transformer for disabling the receiver by short circuiting the primary winding of the input transformer when the switching means is closed thereby to effectively connect the antenna to the oscillator.

Claim 6

A radio transceiver apparatus, comprising: a transmitter including an oscillator for producing a radio frequency carrier signal which is modulated by an audiofrequency intelligence signal applied to the oscillator, the oscillator including a tuned circuit for determining the frequency of the radio frequency carrier signal; a receiver including an input transformer having a primary winding connected in series with the tuned circuit of the oscillator; an antenna connected to the oscillator for radiating modulated radio signals developed by the transmitter and coupled to the antenna, and connected to the primary winding of the input transformer through a portion of the tuned circuit of the oscillator for coupling modulated radio signals received by the antenna to the primary winding of the input transformer; and switching means connected within the tuned circuit of the oscillator for disabling the transmitter by open circuiting the tuned circuit when the switching means is opened thereby to effectively connect the antenna through the portion of the tuned circuit to the primary winding of the input transformer, and the switching means also connected across the primary winding of the input transformer for disabling the receiver by short circuiting the primary winding of the input transformer when the switching means is closed thereby to effectively connect the antenna to the oscillator.

Claim 7

In combination: a transmitter comprising an amplifier device, a bias circuit connected to the amplifier device for establishing the operating point of the amplifier device, a tuned circuit including a tuning capacitor connected to the amplifier device for placing the amplifier device in oscillation so as to produce a radio frequency carrier signal, and generator means connected to the amplifier device for applying an audiofrequency intelligence signal to the amplifier device thereby to amplitude modulate the carrier signal with the intelligence signal so as to obtain an amplitude modulated radio signal; a receiver including an input transformer having a primary winding connected in the bias circuit and to the tuning capacitor in the tuned circuit; an antenna connected to the amplifier device for radiating modulated radio signals coupled from the amplifier device, and connected to the primary winding of the input transformer through the tuning capacitor in the tuned circuit for coupling received modulated signals to the primary winding of the input transformer; and switching means connected in the bias circuit and in the tuned circuit for rendering the transmitter inoperative by open circuiting the bias circuit and the tuned circuit when the switching means is opened thereby to effectively connect the antenna through the tuning capacitor in the tuned circuit to the primary winding of the input transformer, and the switching means also connected across the primary winding of the input transformer for rendering the receiver inoperative by short circuiting the primary winding of the input transformer when the switching means is closed thereby to effectively connect the antenna to the amplifier device.

Claim 8

In combination: a transmitter comprising an amplifier device, a bias circuit connected to the amplifier device for establishing the operating point of the amplifier device, a tuned circuit including a tuning capacitor connected to the amplifier device for placing the amplifier device in oscillation so as to produce a radio frequency carrier signal, and generator means connected to the amplifier device for applying an audiofrequency intelligence signal to the amplifier device thereby to amplitude modulate the carrier signal with the intelligence signal so as to obtain an amplitude modulated radio signal; a receiver including an input transformer having a primary winding connected in the bias circuit and to the tuning capacitor in the tuned circuit; an antenna connected to the amplifier device for radiating modulated radio signals coupled from the amplifier device, and connected to the primary winding of the input transformer through the tuning capacitor in the tuned circuit for coupling received modulated signals to the primary winding of the input transformer; and switching means connected in the bias circuit and in the tuned circuit for rendering the transmitter inoperative by open circuiting the bias circuit and the tuned circuit when the switching means is opened thereby to effectively connect the antenna through the tuning capacitor in the tuned circuit to the primary winding of the input transformer, and the switching means also connected across the primary winding of the input transformer for rendering the receiver inoperative by short circuiting the primary winding of the input transformer when the switching means is closed thereby to effectively connect the antenna to the amplifier device.

Claim 9

In combination: a radio transmitter comprising an amplifying transistor, a bias circuit connected to the amplifying transistor for establishing the operating point of the amplifying transistor, a tuned circuit including a tuning capacitor connected to the amplifying transistor for placing the amplifying transistor in operation so as to produce a radio frequency carrier signal, and generator means connected to the amplifying transistor for applying an audiofrequency intelligence signal to the amplifying transistor thereby to amplitude modulate the carrier signal with the intelligence signal so as to obtain an amplitude modulated radio signal; a receiver including an input transformer having a primary winding connected in the bias circuit and to the tuning capacitor in the tuned circuit; an antenna connected to the amplifying transistor for radiating modulated radio signals coupled from the amplifying transistor, and connected to the primary winding of the input transformer through the tuning capacitor in the tuned circuit for coupling received modulated radio signals to the primary winding of the input transformer; and switching means including a switching transistor connected in series within the bias circuit and the tuned circuit and connected in parallel across the primary winding of the input transformer, the switching means further including a manually operable sWitch connected to the switching transistor for rendering the switching transistor nonconductive to open the bias circuit and the tuned circuit thereby to effectively connect the antenna through the tuning capacitor in the tuned circuit to the primary winding of the input transformer, and for rendering the switching transistor conductive to short the primary winding of the input transformer thereby to effectively connect the antenna to the amplifying transistor.

Claim 10

In combination: a radio transmitter comprising an amplifying transistor, a bias circuit connected to the amplifying transistor for establishing the operating point of the amplifying transistor, a tuned circuit including a tuning capacitor connected to the amplifying transistor for placing the amplifying transistor in operation so as to produce a radio frequency carrier signal, and generator means connected to the amplifying transistor for applying an audiofrequency intelligence signal to the amplifying transistor thereby to amplitude modulate the carrier signal with the intelligence signal so as to obtain an amplitude modulated radio signal; a receiver including an input transformer having a primary winding connected in the bias circuit and to the tuning capacitor in the tuned circuit; an antenna connected to the amplifying transistor for radiating modulated radio signals coupled from the amplifying transistor, and connected to the primary winding of the input transformer through the tuning capacitor in the tuned circuit for coupling received modulated radio signals to the primary winding of the input transformer; and switching means including a switching transistor connected in series within the bias circuit and the tuned circuit and connected in parallel across the primary winding of the input transformer, the switching means further including a manually operable sWitch connected to the switching transistor for rendering the switching transistor nonconductive to open the bias circuit and the tuned circuit thereby to effectively connect the antenna through the tuning capacitor in the tuned circuit to the primary winding of the input transformer, and for rendering the switching transistor conductive to short the primary winding of the input transformer thereby to effectively connect the antenna to the amplifying transistor.