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By Blackburn J. F.

The large examine and improvement attempt that went into the improvement of radar and comparable innovations in the course of global warfare II resulted not just in countless numbers of radar units for army (and a few for attainable peacetime) use but additionally in a superb physique of knowledge and new ideas within the electronics and high-frequency fields. simply because thisbasic fabric might be of significant worth to technological know-how and engineering, it appeared most vital to submit it once safety approved.

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0159in. make up a No. 11. -In order to obtain cables of smaller size but with the same or higher impedance than the above, the size of the center conductor must be reduced in accordance with the following expressions for impedance and capacitance per unit length of a coaxial line: 20 = ~ ohms, log,,; and ~ = 24 X 10–12C farads per meter, loglo ; where c = dielectric constant of insulation, a = diameter of outer conductor, b = diameter of inner conductor. This reduction is accomplished by the use of a center conductor that is a copper-covered steel wire fabricated by a process that welds the copper continuously to the steel core.

If sine-wave alternating current is being applied, E is the rms value. edcontinuousworking-voltage limitsof varioustypesof resistors. In resistors of high resistance little power is dissipated, even with high voltages across the resistor. The upper limit of voltage is set not by the power rating, but by the voltage gradient and the dielectric strength of the materials in the resistor. 8 shows the maximum continuous working-voltage ratings of the various types of resistors. The most important maximum ratings are 350 volts for ~-watt resistors and 500 volts for 1- and 2-watt resistors.

CRT deflection voltages are perhaps the only case where the dielectric is subjected to an appreciable fraction of its rated voltage. The medium size 7$ohm cables are rated at 4000 volts, rms; the small size RG-59/U and RG-6/U at 2300 and 2700 volts, rms; the semisolid low-capacitance cables at 750 or 1000 volts, rms. A dielectric strength test is specified in which an a-c voltage (sine form, 15 to 65 cps) is applied to the cable for 60 sec. 12. High-impedance Cable. ‘—High-impedance cables may be used for the transmission of video signals over distances of approximately 1 to 100 ft.

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Components Handbook by Blackburn J. F.


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