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The report reviews some of the principles and performance of an active interference cancellation system fabricated for UHF communication applications,and the techniques investigated and incorporated to increase the power handling ...
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The report reviews some of the principles and performance of an active interference cancellation system fabricated for UHF communication applications,and the techniques investigated and incorporated to increase the power handling capability of its signal controller. The system employs a synchronous cancellation technique for the suppression of receiver adjacent channel interference. (Author)
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A program was conducted to investigate techniques associated with enhancing the peak power generating capabilities of the Travatron. Analyses aimed at optimizing power-to-size ratios of the device and determination of operating li...
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A program was conducted to investigate techniques associated with enhancing the peak power generating capabilities of the Travatron. Analyses aimed at optimizing power-to-size ratios of the device and determination of operating limits are reported. Various techniques for generation of high voltage pulses suitable for driving the Travatron are analyzed and tested. A breadboard model Travatron generating over 10MW peak power in 10ns pulses at 1.3GHz is also described. (Author)
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The purpose of this note is to characterize the multi-cell structure by means of an equivalent circuit which is valid in the neighborhood of the band, to cast the normal mode equations as a matrix eigenvalue problem, to find the s...
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The purpose of this note is to characterize the multi-cell structure by means of an equivalent circuit which is valid in the neighborhood of the band, to cast the normal mode equations as a matrix eigenvalue problem, to find the solutions for the ideal (unperturbed) circuit, and to calculate properties of the imperfect (perturbed) circuit using these solutions as base vectors in first order perturbation theory. This approach has been used before. Our aim here is to present it in a somewhat different manner which invites comparison with quantum mechanical perturbation theory and to apply it somewhat differently.
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Nonsynchronous interference filters (NIF), based on the ability of potentialoscopes to separate the signal of nonsynchronous pulse interference, are described. Two schemes are given, which use readout cascade and gating methods, r...
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Nonsynchronous interference filters (NIF), based on the ability of potentialoscopes to separate the signal of nonsynchronous pulse interference, are described. Two schemes are given, which use readout cascade and gating methods, respectively. It is concluded that NIF using a potentialoscope with barrier screen possess sufficient reliability, despite their complexity. (Author)
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A miniature, low cost and high performance multiplexer has been successfully developed. The multiplexer provides two contiguous channel filters, DC to 2.5 GHz for channel 1 and 2.5 to 5.0GHz for channel 2. The diplexer has very hi...
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A miniature, low cost and high performance multiplexer has been successfully developed. The multiplexer provides two contiguous channel filters, DC to 2.5 GHz for channel 1 and 2.5 to 5.0GHz for channel 2. The diplexer has very high channel to channel isolation (> 60dB), low insertion loss (<0.7dB center) and good VSWR (< 17dB return loss over the entire band). The printed diplexer has low production and small size ( 1.05(inch)x0.10(inch)x2.40(inch)) that is an ideal candidate for affordable phase array applications.
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The function of the Electromagnetic Radiation System (EMRS) is to generate electromagnetic energy so as to produce a constant field strength that can be automatically scanned as a function of frequency. The design objective is to ...
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The function of the Electromagnetic Radiation System (EMRS) is to generate electromagnetic energy so as to produce a constant field strength that can be automatically scanned as a function of frequency. The design objective is to cover the frequency range of 30 hertz to 40 gigahertz with field strength intensities up to 200 volts per meter. A stripline approach is described and proposed for use as the field generating device for the lower frequencies. The use of defocused parabolas are proposed for use at the higher frequencies. (Author)
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A method of measuring the sensitivity and radiated power of oscillator-detector systems without the need for calibration with a pole test is presented. The measurement technique applies to both CW and modulated systems. The basic ...
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A method of measuring the sensitivity and radiated power of oscillator-detector systems without the need for calibration with a pole test is presented. The measurement technique applies to both CW and modulated systems. The basic measuring technique is discussed, and then a rapid testing procedure, which requires chamber precalibration over the desired frequency range, is described. Reference is made to a novel standard loop antenna which has a 50-ohm driving impedance and is used in the measurement procedure. An error analysis is included which can be used to determine the accuracy of this technique. (Author)
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The report includes the design data and test results for a high power UHF traveling wave amplifier. The amplifier consisted of two helix type window tubes in series. The amplifier had 16db of gain and 20kilowatts of continuous pow...
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The report includes the design data and test results for a high power UHF traveling wave amplifier. The amplifier consisted of two helix type window tubes in series. The amplifier had 16db of gain and 20kilowatts of continuous power output. The instantaneous 3db electronic bandwidth was from 225 MHZ to 400 MHZ. Preliminary design data is also included for a conventional single tube amplifier and a novel double helix traveling wave amplifier. (Author)
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The RIG Squib is a combination attenuator and electroexplosive device which can be used as a replacement for squibs employed in various ordnance circuits. The attenuator portion of the squib is a low pass device whereby direct cur...
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The RIG Squib is a combination attenuator and electroexplosive device which can be used as a replacement for squibs employed in various ordnance circuits. The attenuator portion of the squib is a low pass device whereby direct current (dc) and low frequency energy are permitted to enter the squib section relatively unaffected, while high frequency electromagnetic energy impinging upon the attenuator's input is reduced to a small level. As a result, utilization of the RIG Squib could serve to preclude or greatly reduce the hazard of stray electromagnetic radiation initiating ordnance items.
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The amplitude response of a receiver to off-tuned pulses is shown to approximately consist of a sin x impulse followed by a steady state portion with a second sin x impulse concluding the response. The probability of detecting the...
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The amplitude response of a receiver to off-tuned pulses is shown to approximately consist of a sin x impulse followed by a steady state portion with a second sin x impulse concluding the response. The probability of detecting the sin x impulse is determined and some typical results presented. These results can also be used to predict the probability of detecting optimum design pulses whose response is a sin x function. The detection curves of the sin x pulse are compared to those of the ideal square pulse and it is shown that a 1/(square root of 2) reduction of the peak pulse amplitude approximates the correct probability of detection curves. The total probability of detection is obtained by using a peak factor (F factor) to calculate the probability of detecting the impulse responses and applying conservation of energy to calculate the probability of detecting the steady state portion. (Author)
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