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16.9 The Home Receiver Outdoor Unit (ODU) The home receiver consists of two units an outdoor unit and an indoor unit. Commercial brochures refer to the complete receiver as an IRD. Figure 16.5 is a block schematic for the ODU. This will be seen to be similar to the outdoor unit shown in Fig. 8.1. The downlink signal, covering the frequency range 12.2 to 12.7 GHz, is focused by the antenna into the receive horn. The horn feeds into a polarizer that can be switched to pass either left-hand circular or right-hand circular polarized signals. The low-noise block that follows the polarizer contains a low-noise amplifier (LNA) and a downconverter. The function of the LNA is described in Sec. 12.5. The downconverter converts the 12.2- to 12.7-GHz band to 950 to 1450 MHz, a frequency range better suited to transmission through the connecting cable to the indoor unit. The antenna usually works with an offset feed (see Sec. 6.14), and a typical antenna structure is shown in Fig. 16.6. It is important that the antenna have an unobstructed view of the satellite cluster to which it is aligned. Alignment procedures are described in Sec. 3.2. The size of the antenna is a compromise among many factors but typically is around 18 in. (46 cm) in diameter. A small antenna is desirable for a number of reasons. Small antennas are less intrusive visually and also are less subject to wind loading. In manufacture, it is easier to control surface irregularities, which can cause a reduction in gain by scattering the signal energy. The reduction can be expressed as a function of the root-meansquare (rms) deviation of the surface, referred to an ideal parabolic surface.

12.2 1

950 1450 MHz To indoor unit (IDU)

b What is the money income of individuals c Find consumer spending when individuals spend 90 percent of their income d What money revenues are received by the business sector from consumer spending e What is the relationship of the cost of producing output and the money receipts of businesses when there are only consumer expenditures What should happen to the level of output Solution: a The money value of output equals the output times the average price per unit The money value of output is $750 (500 $150) b Since individuals receive an amount equal to the money value of output, their money income is $750 c Individuals are spending $675 090 times their $750 money income There is a $75 saving leakage from the circular ow d Business revenues equal the sum of aggregate spending Since individuals are the only source of spending, revenues equal $675.

Block schematic for the outdoor unit (ODU).

The reduction in gain is given by (see Baylin and Gale, 1991)

Sub procedures are blocks of code that another procedure in your application explicitly calls. They may contain parameters when called, but they do not return a value. The syntax of a Sub procedure is [Private|Public|Static] Sub ProcedureName([argumentlist]) <... block of statements ...> End Sub The statements between Sub and End Sub are executed each time the Sub procedure is called. By default, Sub procedures are Public and therefore may be called from a UserForm, Class, or Standard module unless specified otherwise using the Private keyword. The argument list is similar to the variables declared in a Sub procedure. These are variables that the calling procedure passes to the Sub procedure when it is executed. For more details on passing arguments to procedures, see the Passing Arguments to Procedures section later in this chapter. The following example illustrates a typical Sub procedure. In this example, the Layers collection displays the name of each layer in the currently active document. Public Sub IterateLayers() Dim Layer As AcadLayer For Each Layer In ThisDrawing.Layers Debug.Print Layer.Name Next Layer End Sub

e8.8

(16.7)

where is the rms tolerance in the same units as l, the wavelength. For example, at 12 GHz (wavelength 2.5 cm) and for an rms tolerance of 1 mm, the gain is reduced by a factor