Download Death of a Pirate: British Radio and the Making of the by Adrian Johns PDF

By Adrian Johns

While the pirate operator Oliver Smedley shot and killed his rival Reg Calvert in Smedley’s nation cottage on June 21, 1966, it was once a turning aspect for the outlaw radio stations dotting the coastal waters of britain. located on ships and offshore forts like Shivering Sands, those stations blasted away on the high-minded BBC’s broadcast monopoly with the hot beats of the Stones and DJs like Screaming Lord Sutch. For free-market ideologues like Smedley, the pirate stations have been entrepreneurial efforts to undermine the becoming British welfare country as embodied through the BBC. The worlds of excessive desk and underground collide during this riveting background.

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The complete family of solutions forms a wide and sometimes rather complicated group. No attempt will be made here to discuss general solutions, rather we will outline the properties of the harmonic waves. 26). 26). 29) but with an amplitude, uo, that generally is complex. 35) = = ik·A, = -k 2A. 26), but these also must obey Maxwell's equations. Because of the decoupling of the two fields in the wave equation, this produces some additional constraints. In order to investigate the properties of plane waves as simply as possible, we arrange the rectangular coordinate system such that the wave propagates in the positive z direction.

29)]. 37) for plane harmonic waves, we find aEx az aEy az . JL . i WJL lkEx = --Hy = --Hy, c c JL . iWJL 1 kEy = -Hx = ---Hx, . 45) E and H are thus always perpendicular; together with the wave vector k, these form an orthogonal system. 46) The unit of this intrinsic impedance of the medium in which the wave propagates is the Ohm (Q). 73Q. 6 Wave Packets and the Group Velocity 25 Finally, the energy flux of the Poynting vector of this wave is of interest. 48) and S points in the direction of the propagation vector k.

79) together the relation 30 2. 80) is obtained. For some applications the index of refraction is a useful quantity. 81 ) Electromagnetic pulses propagate with the group velocity. This varies with frequency so that there is a dispersion in the pulse propagation in a plasma. This fact took on a fundamental importance when the radio pulsars were detected in 1967. The arrival time of pulsar pulses depends on the frequency at which they are measured: The lower the observing frequency, the later the pulse arrives.

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