Frequency modulation system for spreading radiated power

Claim 5

Apparatus for spreading the power radiated from a transmitter over a frequency band comprising a. first means for providing a first band of signal frequencies, b. second means for generating a sawtooth signal having a specified repetition rate chosen to provide a spectrum which is essentially entirely below said entire first band of signal frequencies, c. third means coupled to said first means and said second means for providing a composite signal which signal is the sum of said first band of signal frequencies and said sawtooth signal, and d. means coupled to said third means to modulate a carrier in accordaNce with said composite signal to distribute said carrier''s energy in a second band of frequencies with each one of said last-mentioned frequencies separated from another by a factor of said sawtooth''s repetition rate.

Claim 6

Apparatus for spreading the power radiated from a transmitter over a frequency band comprising a. first means for providing a first band of signal frequencies, b. second means for generating a sawtooth signal having a specified repetition rate chosen to provide a spectrum which is essentially entirely below said entire first band of signal frequencies, c. third means coupled to said first means and said second means for providing a composite signal which signal is the sum of said first band of signal frequencies and said sawtooth signal, and d. means coupled to said third means to modulate a carrier in accordaNce with said composite signal to distribute said carrier''s energy in a second band of frequencies with each one of said last-mentioned frequencies separated from another by a factor of said sawtooth''s repetition rate.

Claim 7

Apparatus for spreading the power radiated from a transmitter operating at a frequency range in which the amount of power is restricted to a specified value in a series of adjacent frequency slots representing said frequency range, comprising, a. a source providing a first band of input signal frequencies containing information to be transmitted, b. modulating means coupled to said source to shift said first band of input signal frequencies to a second higher band of frequencies, c. sawtooth generating means for generating a sawtooth wave having a repetition frequency which is a function of said spacing of said frequency slots and which repetition frequency is chosen to provide a spectrum which is essentially entirely below said entire second band frequency, d. means coupled to said modulating means and said sawtooth generating means for providing a composite signal of said sawtooth wave and said second band of frequencies, e. a carrier frequency oscillator, and f. means for frequency modulating said carrier frequency oscillator in response to said composite signal to provide the specified value of power in each of said frequency slots.

Claim 8

Apparatus for spreading the power radiated from a transmitter operating at a frequency range in which the amount of power is restricted to a specified value in a series of adjacent frequency slots representing said frequency range, comprising, a. a source providing a first band of input signal frequencies containing information to be transmitted, b. modulating means coupled to said source to shift said first band of input signal frequencies to a second higher band of frequencies, c. sawtooth generating means for generating a sawtooth wave having a repetition frequency which is a function of said spacing of said frequency slots and which repetition frequency is chosen to provide a spectrum which is essentially entirely below said entire second band frequency, d. means coupled to said modulating means and said sawtooth generating means for providing a composite signal of said sawtooth wave and said second band of frequencies, e. a carrier frequency oscillator, and f. means for frequency modulating said carrier frequency oscillator in response to said composite signal to provide the specified value of power in each of said frequency slots.

Claim 9

Apparatus for spreading the radiated power over a frequency band from a transmitter operating at a specified carrier frequency, comprising, a. a source providing a first band of input signal frequencies, b. first means coupled to said source to shift said first band of input signal frequencies to another band of frequencies, c. second means for generating a linear sawtooth having a specified repetition rate chosen to provide a spectrum which is essentially entirely below said entire other band of frequencies, d. third means coupled to said first means and second means to provide a composite signal from said other band of frequencies and said linear sawtooth, e. an oscillator at said specified carrier frequency, and f. means coupled to said oscillator and said third means to substantially equally distribute said carrier frequency energy in frequency slots spaced by said sawtooth''s repetition rate.

Claim 10

Apparatus for spreading the radiated power over a frequency band from a transmitter operating at a specified carrier frequency, comprising, a. a source providing a first band of input signal frequencies, b. first means coupled to said source to shift said first band of input signal frequencies to another band of frequencies, c. second means for generating a linear sawtooth having a specified repetition rate chosen to provide a spectrum which is essentially entirely below said entire other band of frequencies, d. third means coupled to said first means and second means to provide a composite signal from said other band of frequencies and said linear sawtooth, e. an oscillator at said specified carrier frequency, and f. means coupled to said oscillator and said third means to substantially equally distribute said carrier frequency energy in frequency slots spaced by said sawtooth''s repetition rate.

Claim 11

In combination a. a spacecraft, b. a directive antenna mounted on said spacecraft and oriented to transmit energy in a given direction, c. first means coupled to said antenna to provide an energizing carrier frequency thereto, d. receiving means coupled to said spacecraft to provide a first band of signal frequencies, e. a sawtooth generator for producing a sawtooth signal having a specified repetition rate chosen to provide a spectrum which is essentially entirely below said entire first band of frequency, f. summing means coupled to said receiving means and said sawtooth generator to produce a composite signal which is proportional to the sum of said first band of signal frequencies and said sawtooth signal, and g. modulating means coupled to said first means and said third means to vary said carrier frequency''s energy in accordance with said composite signal to spread said carrier frequency over a second band of frequencies spaced at intervals determined by said sawtooth''s repetition rate.

Claim 12

In combination a. a spacecraft, b. a directive antenna mounted on said spacecraft and oriented to transmit energy in a given direction, c. first means coupled to said antenna to provide an energizing carrier frequency thereto, d. receiving means coupled to said spacecraft to provide a first band of signal frequencies, e. a sawtooth generator for producing a sawtooth signal having a specified repetition rate chosen to provide a spectrum which is essentially entirely below said entire first band of frequency, f. summing means coupled to said receiving means and said sawtooth generator to produce a composite signal which is proportional to the sum of said first band of signal frequencies and said sawtooth signal, and g. modulating means coupled to said first means and said third means to vary said carrier frequency''s energy in accordance with said composite signal to spread said carrier frequency over a second band of frequencies spaced at intervals determined by said sawtooth''s repetition rate.

Claim 13

In a communication system for communication between an unmanned, orbiting spacecraft and a ground station remote therefrom, the improvement in the ground station comprising a. a source of intelligence-bearing signal located at said ground station, said intelligence-bearing signal being wholly within a given frequency band, b. a sawtooth generator at said ground station for producing a sawtooth having a specified repetition rate chosen to provide a spectrum which is essentially entirely below said entire given frequency band, c. a linear adder coupled to said intelligence-bearing signal source and said sawtooth geNerator to provide a composite signal, d. a source of carrier frequency, e. first means coupled to said carrier source and said linear adder to modulate said carrier frequency''s energy in accordance with said composite signal to spread out said carrier frequency''s energy over a band of frequencies spaced at intervals determined by said sawtooth''s repetition rate, f. a directive antenna located at said remote station and directed to transmit to said spacecraft, and g. further means to couple said first means to said directive antenna to cause said antenna to radiate said carrier''s spreaded energy in the direction of said spacecraft.

Claim 14

In a communication system for communication between an unmanned, orbiting spacecraft and a ground station remote therefrom, the improvement in the ground station comprising a. a source of intelligence-bearing signal located at said ground station, said intelligence-bearing signal being wholly within a given frequency band, b. a sawtooth generator at said ground station for producing a sawtooth having a specified repetition rate chosen to provide a spectrum which is essentially entirely below said entire given frequency band, c. a linear adder coupled to said intelligence-bearing signal source and said sawtooth geNerator to provide a composite signal, d. a source of carrier frequency, e. first means coupled to said carrier source and said linear adder to modulate said carrier frequency''s energy in accordance with said composite signal to spread out said carrier frequency''s energy over a band of frequencies spaced at intervals determined by said sawtooth''s repetition rate, f. a directive antenna located at said remote station and directed to transmit to said spacecraft, and g. further means to couple said first means to said directive antenna to cause said antenna to radiate said carrier''s spreaded energy in the direction of said spacecraft.