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1.13. The Cospas-Sarsat Web site is at http://www.cospas-sarsat.org. Access this site and find out the number and location of the LEOLUTs in current use. 1.14. Using information obtained from the Cospas-Sarsat Web site, find out which satellites carry (a) 406-MHz SAR processors (SARPs), (b) 406-MHz SAR repeaters (SARRs), and (c) 121.5-MHz SARRs. What is the basic difference between a SARP and a SARR 1.15. Intelsat satellite 904 is situated at 60 E. Determine the land areas (markets)the satellite can service. The global EIRP is given as 31.0 up to 35.9 dBW, beam edge to beam peak. What are the equivalent values in watts (see App. G for the definition of dBW). 1.16. A satellite is in a circular polar orbit at a height of 870 km, the orbital period being approximately 102 min. Assuming an average value of earth s radius of 6371 km determine approximately the maximum period the satellite is visible from a beacon at sea level. 1.17. A satellite is in a circular polar orbit at a height of 870 km, the orbital period being approximately 102 min. The satellite orbit passes directly over a beacon at sea level. Assuming an average value of earth s radius of 6371 km determine approximately the fractional Doppler shift at the instant the satellite is first visible from the beacon.

large signals being quantized into coarser steps than small signals This is termed compression, and it is introduced to keep the signalto-quantization noise ratio reasonably constant over the full dynamic range of the input signal while maintaining the same number of bits per codeword At the receiver (the D/A block in Fig 104), the binary codewords are automatically decoded into the larger quantized steps for the larger signals, this being termed expansion The expansion law is the inverse of the compression law, and the combined processing is termed companding Figure 104b shows how the MC145500 codec achieves compression by using a chorded approximation The leading bit of the digital codeword is a sign bit, being 1 for positive and 0 for negative samples of the analog signal.

The next three bits are used to encode the chord in which the analog signal falls, the three bits giving a total of eight chords Each chord is made to cover the same number of input steps, but the step size increases from chord to chord The chord bits are followed by four bits indicating the step in which the analog value lies The normalized decision levels shown in Fig 104b are the analog levels at which the comparator circuits change from one chord to the next and from one step to the next These are normalized to a value 8159 for convenience in presentation For example, the maximum value may be considered to be 8159 mV, and then the smallest step would be 1 mV.

The first step is shown as 1 (mV), but it should be kept in mind that the first quantized level spans the analog zero so that 0 must be distinguished from 0 Thus the level representing zero has in fact a step size of 1 mV As an example, suppose the sampled analog signal has a value 500 mV This falls within the normalized range 479 to 511 mV, and therefore, the binary code is 10111111 It should be mentioned that normally the first step in a chord would be encoded 0000, but the bits are inverted, as noted in Fig 104b This is so because low values are more likely than high values, and inversion increases the 1-bit density, which helps in maintaining synchronization The table in Fig 104b shows mu-law encode-decode characteristics.

Use the IsURL method to determine if a string is a properly formed URL. It does not ensure that the URL is actually accessible, just that it is syntactically correct. It returns a Boolean. Its syntax is as follows: blnStatus = UtilityObject.IsURL(InputURL) This method has one parameter, InputURL, a string. Use it to specify the URL to check for validity. This example gets a string from the user and then, using IsURL, displays whether it is a valid URL: Public Sub TestIsURL() Dim strInput As String With ThisDrawing.Utility strInput = .GetString(True, vbCr & "Enter a URL: ") If .IsURL(strInput) Then MsgBox "You entered a valid URL" Else MsgBox "That was not a URL" End If End With End Sub