By Blackburn J. F.

The large study and improvement attempt that went into the improvement of radar and similar ideas in the course of international struggle II resulted not just in hundreds and hundreds of radar units for army (and a few for attainable peacetime) use but additionally in a superb physique of data and new options within the electronics and high-frequency fields. simply because thisbasic fabric might be of serious price to technological know-how and engineering, it appeared most crucial to submit it once safeguard accredited.

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This procedure has proved both simple and reliable. The free end of the wire hook can be inserted into any of the usual connectors and soldered to them. The tensile strength of the hook-and-polyethylene weld is considerable and strain on the coiled conductor is taken up by a harmless elongation of the helix. The method is illustrated in Fig. 12. Fm. —Method of terminating inner conductor. , ● CHAPTER FIXED COMPOSITION BY f 1 G. 2 RESISTORS EHRENFRIED The various types of fixed resistors form the subject matter of the next two chapters.

4. Radial-lug resistors. This type is represented by one JAN style (RC-76) and differs from the radial-lead type only in having soldering lugs instead of wire leads. It is seldom used. Dimensions. -Figure 2“1 shows the dimensions of the various standard styles of resistors. It will be noted that in case of. the insulated styles these dimensions are mostly maximum dimensions, and not dimensions that have to be met within certain tolerances. The result is that each style includes resistors of a considerable variety of sizes, ranging from the allowed maximum to about a fourth of the allowed maximum volume.

Wound single- be (3) henries per meter. L = 10-’%r%2d2 The capacitance C of a concentric cable will be ~ = 24 x lo-%k farads per meter. (4) 106310 (): From Eqs. (1), (3) and (4) Eq. =J5=@_Jq. (5) From Eqs. (2), (3), and (4), Eq. (6) for the time delay T follows: T=lo6J7=’Oj:o::y ‘sec. ‘6) With negligible error, the surface of the coiled inner conductor is assumed to be a cylinder of diameter b. Then (7) b=d+w and the core diameter is c =d --w. (8) The design of a cable starts with the choice of the largest practicable outer diameter, for it follows from Eqs.

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