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By Timothy Budd

Budd's advent to Smalltalk programming and the Little Smalltalk interpreter specializes in ordinary, instead of complicated issues of object-oriented programming. The Little Smalltalk procedure runs lower than the UNIX working procedure and will be carried out on traditional terminals.

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A tuned antenna such as a half-wave dipole has a resistance of ∼73 . 1) of 50 . Thus there is a mismatch which results in some power being reflected, that is, not all the power is transmitted. Note that domestic RF cables usually have a characteristic impedance of 75 and therefore match the impedance of dipole aerials more closely. 12) where D is the directivity in linear terms G is the gain in linear terms. The efficiencies of antennas vary between about 50% and 100%. If the gain and directivity are in dB then the efficiency would also be in dB and is not usually expressed as a percentage in this case: ηdB = GdB − DdB .

The following steps describe in detail the process for case (e): 1. Draw a horizontal line to a convenient length with an arrow at the right-hand end. This is used as the scale unit 1 for the first phasor. 2. Using a protractor mark out 135◦ from the arrow end of the first phasor. 3. 93 times the length of the first phasor, with an arrow at its top end. 4. Join the start of the first line and the arrow end of the second phasor. 5. The new line represents the resultant phasor. 41 times the first vector and its phase is 105◦ compared with the first vector.

A line through the centre/equator corresponds to the azimuth line radiation plot when plotted in polar or rectangular coordinates. 35. 34 Contour plots on a spherical surface. Reproduced by kind permission of ASL [5]. See Plate 3 for the colour figure. 35 Mercator’s projection of a contour plot. Reproduced by kind permission of ASL [5]. See Plate 4 for the colour figure. 36 Mercator’s projection of the radiation pattern, showing lines of equal gain/power levels. Reproduced by kind permission of ASL [5].

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