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In CCIR Report 634 2 (1982), the International Radio Consultative Committee (CCIR) specifies the permissible interference level for TV carriers in terms of a parameter known as the protection ratio. The protection ratio is defined as the minimum carrier-to-interference ratio at the input to the receiver which results in just perceptible degradation of picture quality. The protection ratio applies only for wanted and interfering TV carriers at the same frequency, and it is equivalent to [C/I ]pb evaluated for this situation. Denoting the quality impairment factor by QIF and the protection ratio in decibels by [PR0], the equation given in CCIR Report 634 2 (1982) is [PR0] 12.5 20 loga Dv b 12 QIF 1.1Q2 IF (13.9)

Example 13.5 An FM/TV carrier is specified as having a modulation index of 2.571 and a top modulating frequency of 4.2 MHz. Calculate the protection ratio required to give a quality impairment factor of (a) 4.2 and (b) 4.5.

Solution The peak-to-peak deviation is 2 (13.9) gives the following results:

A rm s demand for a productive resource will increase (i.e., shift up) if: (1) the product demand increases; (2) the productivity of the resource rises; (3) the prices of substitute resources rise; or (4) the prices of complementary resources fall.

Tasks that occur frequently or are of a complex nature are ideal candidates for a macro. Using a macro gives you a more consistent and convenient way to accomplish these tasks. Macros let you create this process once and then reuse it multiple times. You can create macros in one of two places, in either the ThisDrawing module or in a standard module. In either case, always declare them as Public subprocedures and not functions that return a value and can t receive arguments. Despite these limitations, macros are a powerful tool for increasing AutoCAD end-user productivity. An example of where you might want to use a macro is in initializing user preferences whenever a drawing is created or opened, as in the following code: Public Sub Setup() Application.Preferences.OpenSave.AutoSaveInterval = 15 End Sub In this example, AutoCAD will save the user s work every 15 minutes. You might consider using a macro similar to this to set various system variables for each drawing that you work on or perhaps for when each AutoCAD session begins. The previous section explained how to make VBA routines execute automatically for the start of either an AutoCAD session or a drawing.

2.571 b

[PR0]

21.6 12

[PR0]

It should be noted that the receiver transfer characteristic discussed in Sec. 13.2.6 was developed from the CCIR protection ratio concept (see Jeruchim and Kane, 1970). 13.3 Energy Dispersal The power in a frequency-modulated signal remains constant, independent of the modulation index. When unmodulated, all the power is at the carrier frequency, and when modulated, the same total power is distributed among the carrier and the sidebands. At low modulation indices the sidebands are grouped close to the carrier, and the power spectral density, or wattage per unit bandwidth, is relatively high in that spectral region. At high modulation indices, the spectrum becomes widely spread, and the power spectral density relatively low. Use is made of this property in certain situations to keep radiation within CCIR recommended limits. For example, to limit the A2 mode of interference in the 1- to 15-GHz range for the fixed satellite service, CCIR Radio Regulations state, in part, that the earth station EIRP should not exceed 40 dBW in any 4-kHz band for 0 and should not exceed 40 3 dBW in any 4-kHz band for 0 5 . The angle is the angle of elevation of the horizon viewed from the center of radiation of the earth station antenna. It is positive for angles above the horizontal plane, as illustrated in Fig. 13.7a, and negative for angles below the horizontal plane, as illustrated in Fig. 13.7b.

For space stations transmitting in the frequency range 3400 to 7750 MHz, the limits are specified in terms of power flux density for any 4- kHz bandwidth. Denoting the angle of arrival as degrees, measured above the horizontal plane as shown in Fig. 13.7c, these limits are

A rm s demand for a resource (say, labor) depends in large part upon circumstances beyond the rm s control.

152 dB(W/m2) in any 4-kHz band for 0 152 0.5 (

CHAPTER 1 THE VBA INTEGRATED DEVELOPMENT ENVIRONMENT (VBAIDE)

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