Dual frequency transmitter system

Claim 2

A radio transmitter including two diversely tuned oscillators, a source of sequential on-off control signals, a single lead connecting said source of on-off control signals to both said oscillators concurrently, the on signals conditioning both said oscillators for concurrent oscillation and the off signals inhibiting said oscillation of both said oscillators, bistable flip-flop, means responsive to the alternate states of said bistable flip-flop for alternately inhibiting said oscillations of said oscillators in sequence, means connecting said single lead to Said flip-flop for applying said on-off signals to said flip-flop, said flip-flop being responsive to said on-off control signals for alternating the states of said flip-flop.

Claim 3

A radio transmitter including two diversely tuned oscillators, a source of sequential on-off control signals, a single lead connecting said source of on-off control signals to both said oscillators concurrently, the on signals conditioning both said oscillators for concurrent oscillation and the off signals inhibiting said oscillation of both said oscillators, bistable flip-flop, means responsive to the alternate states of said bistable flip-flop for alternately inhibiting said oscillations of said oscillators in sequence, means connecting said single lead to Said flip-flop for applying said on-off signals to said flip-flop, said flip-flop being responsive to said on-off control signals for alternating the states of said flip-flop.

Claim 4

A radio transmitter including two diversely tuned oscillators, a source of sequential on-off control signals, a single lead connecting said source of on-off control signals to both said oscillators concurrently, the on signals conditioning both said oscillators for concurrent oscillation and the off signals inhibiting said oscillation of both said oscillators, bistable flip-flop, means responsive to the alternate states of said bistable flip-flop for alternately inhibiting said oscillations of said oscillators in sequence, means connecting said single lead to Said flip-flop for applying said on-off signals to said flip-flop, said flip-flop being responsive to said on-off control signals for alternating the states of said flip-flop.

Claim 5

The combination according to claim 1, wherein each of said oscillators includes a transistor having a base and wherein a separate piezo-electric crystal is connected between each said base of said transistors and ground, and a common tank circuit connected jointly in series with the collectors of both said transistors.

Claim 6

The combination according to claim 2, wherein said on-off signals are alternately high and low voltages, wherein said single lead applies said alternately high and low voltages to said bases to turn said transistors alternately on and off concurrently, said bistable flip-flop having two points of alternately high and low voltage representing said states of said flip-flop, means connecting said points to said bases, respectively, of said transistors, and means for transferring the state of said flip-flop in response to each occurrence of said low voltage on said single lead.

Claim 7

A radio transmitter including two diversely tuned oscillators, a source of sequential on-off control signals, a single lead connecting said source of on-off control signals to both said oscillators concurrently, the on signals conditioning both said oscillators for concurrent oscillation and the off signals inhibiting said oscillations, a bistable flip-flop for alternately inhibiting said oscillations of said oscillator in sequence, means connecting said single lead to said flip-flop for applying said on-off signals to said flip-flop, said flip-flop being responsive to said on-off control signals for alternating the states of said flip-flop, a tank circuit connected to said oscillators, a radio frequency amplifier connected in cascade with said tank circuit, a modulator amplifier connected to supply operating current to said radio frequency amplifier, means for maintaining current flow from said modulator amplifier into said radio frequency amplifier means responsive to excess of average value of said current flow with respect to a predetermined value for disabling said modulator amplifier, means for timing the transmission time of said radio frequency amplifier, and means responsive to continuing transmission of radio frequency amplifier for a time interval in excess of a predetermined time interval for disabling said modulator amplifier.

Claim 8

A radio transmitter including two diversely tuned oscillators, a source of sequential on-off control signals, a single lead connecting said source of on-off control signals to both said oscillators concurrently, the on signals conditioning both said oscillators for concurrent oscillation and the off signals inhibiting said oscillations, a bistable flip-flop for alternately inhibiting said oscillations of said oscillator in sequence, means connecting said single lead to said flip-flop for applying said on-off signals to said flip-flop, said flip-flop being responsive to said on-off control signals for alternating the states of said flip-flop, a tank circuit connected to said oscillators, a radio frequency amplifier connected in cascade with said tank circuit, a modulator amplifier connected to supply operating current to said radio frequency amplifier, means for maintaining current flow from said modulator amplifier into said radio frequency amplifier means responsive to excess of average value of said current flow with respect to a predetermined value for disabling said modulator amplifier, means for timing the transmission time of said radio frequency amplifier, and means responsive to continuing transmission of radio frequency amplifier for a time interval in excess of a predetermined time interval for disabling said modulator amplifier.

Claim 9

The combination according to claim 4, wherein said last means includes a current sampling resistance, a rectifier diode, a timing resistance and a timing capacitor, connected in the order recited between the output of said radio frequency amplifier and ground, a gated diode switch connected across said capacitor, said gated diode switch having a cathode connected to ground, an anode connected to said capacitor and a gate connected to the cathode of said rectifier diode, and wherein the anode of said rectifying diode is connected to control charging of said capacitor.

Claim 10

The combination according to claim 4, wherein each of said oscillators includes a transistor and wherein a separate piezo-electric crystal is connected between each base of said transistors and ground, for tuning said oscillators and, wherein said tank circuit is connected jointly in series with the collectors of both said transistors.

Claim 11

The combination according to claim 6, wherein said on-off signals are alternately high and low voltages, wherein said single lead connects said alternately high and low voltages to said bases to turn said transistors alternately on and off concurrently, said bistable flip-flop having two points of alternately high and low voltage representing said states of said flip-flop, means connecting said points to said bases, respectively, of said transistors, and means for transferring the state of said flip-flop in response to each occurrence of said low voltage on said single lead.

Claim 12

A radio transmitter including an r.f. oscillator, an r.f. amplifier connected in cascade with said r.f. oscillator, a modulator amplifier connected to said r.f. amplifier to provide bursts of modulating signal to said r.f. amplifier, a gate controlled diode connected to inhibit said modulating signal when fired, means for measuring average modulating current during each of said bursts supplied by said modulator amplifier, and means responsive to a level of said modulating current in excess of a predetermined value as measured by said means for measuring for applying between the gate and anode of said gate controlled diode a voltage selected to fire said gate controlled diode.

Claim 13

A radio transmitter including an r.f. oscillator, an r.f. amplifier connected in cascade with said r.f. oscillator, a modulator amplifier connected to said r.f. amplifier to provide bursts of modulating signal to said r.f. amplifier, a gate controlled diode connected to inhibit said modulating signal when fired, means for measuring average modulating current during each of said bursts supplied by said modulator amplifier, and means responsive to a level of said modulating current in excess of a predetermined value as measured by said means for measuring for applying between the gate and anode of said gate controlled diode a voltage selected to fire said gate controlled diode.