Abstract A phase-modulated, high-power binary data transmission system includes a variable frequency oscillator klystron generating a carrier signal under the control of a binary information generator. The frequency of the oscillator is periodically varied a small amount sufficient to cause a gradual linear change in the phase of the carrier signal such that the carrier signal at specific clock times is of opposed phase in accordance with the binary information. The oscillator output is continuously sampled and compared in a mixer to the output of a highly stable oscillator operating at the carrier frequency to produce a signal having an average value which is a function of the difference in phase between the mixed signals. This signal is then analyzed and compared to the output of the binary information generator to determine if the klystron is operating at the correct frequency and phase, and if the change in frequency is correct. If an error in any of these parameters is detected an error signal is generated which is then used to shift the value of the klystron input signal to correct the output thereof. The invention described herein may be manufactured, used, and licensed by or for the Government for governmental purposes without the payment to me of any royalty thereon.
A binary communication system for transmitting a carrier signal which is periodically of equal phase and of opposed phase with respect to a referenCe signal comprising; a clock means for generating a clock signal; a binary information generator means controlled by said clock means for generating a two-level information signal at the rate of said clock signal; control means connected to the output of said binary information generator means for shifting the levels of said two-level information signal; a variable frequency oscillator means for generating said carrier signal and having the frequency thereof shifted between first and second frequencies by the output of said control means; the difference between said first and second frequencies being equal to an odd multiple of one-half the rate of said clock signal; a stable oscillator means for generating a reference signal at said first frequency and at a fixed phase with respect to said clock signal; mixer means for comparing the outputs of each said oscillators to determine the difference in phases thereof; comparator means for comparing said two-level information signal to the output of said mixer means for generating first and second error signals; said first error signal being a function of the phase differences detected by said mixer means and said second error signal being a function of the change in the difference in phase detected by said mixer means during the periods when said variable frequency oscillator should be operating at said first frequency; and means for applying said error signals to said control means for shifting the levels of said two-level information signal in accordance with said error signals.
Claim 2
Dependent Claim
269 words
A binary communication system for transmitting a carrier signal which is periodically of equal phase and of opposed phase with respect to a referenCe signal comprising; a clock means for generating a clock signal; a binary information generator means controlled by said clock means for generating a two-level information signal at the rate of said clock signal; control means connected to the output of said binary information generator means for shifting the levels of said two-level information signal; a variable frequency oscillator means for generating said carrier signal and having the frequency thereof shifted between first and second frequencies by the output of said control means; the difference between said first and second frequencies being equal to an odd multiple of one-half the rate of said clock signal; a stable oscillator means for generating a reference signal at said first frequency and at a fixed phase with respect to said clock signal; mixer means for comparing the outputs of each said oscillators to determine the difference in phases thereof; comparator means for comparing said two-level information signal to the output of said mixer means for generating first and second error signals; said first error signal being a function of the phase differences detected by said mixer means and said second error signal being a function of the change in the difference in phase detected by said mixer means during the periods when said variable frequency oscillator should be operating at said first frequency; and means for applying said error signals to said control means for shifting the levels of said two-level information signal in accordance with said error signals.
Claim 3
Dependent Claim
56 words
The device according to claim 1 and wherein said control means includes; a subtractor means for generating a difference signal which is the difference between said first and second error signals; and a variable gain amplifier means being controlled by said difference signal for varying the difference between the levels of said two level information signal.
Claim 4
Dependent Claim
27 words
The device according to claim 2 and wherein said control means further includes an adder means for adding said second error signal to said two-level information signal.
Claim 5
Dependent Claim
17 words
The device according to claim 1 and wherein said variable frequency oscillator means is a klystron oscillator.