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Specifications The specifications of a receiver indicate how well it can do the functions it is designed to perform Sensitivity: The most common way to express receiver sensitivity is to state the number of microvolts that must exist at the antenna terminals to produce a certain signal-to-noise (S/N) ratio or signal-plus-noise-to-noise (S+N/N) ratio in decibels (dB) Sensitivity is related to the gain of the front end (the amplifier or amplifiers connected to the antenna), but the amount of noise this stage generates is more significant, because subsequent stages amplify the front-end noise output as well as the signal output Selectivity: The passband, or bandwidth that the receiver can hear, is established by a wideband preselector in the early RF amplification stages, and is honed to precision by narrowband filters in later amplifier stages The preselector makes the receiver optimally sensitive within a range of approximately plus-or-minus 10 percent ( 10%) of the desired signal frequency The narrowband filter responds only to the frequency or channel of a specific signal to be received; signals in nearby channels are rejected Dynamic range: The signals at a receiver input vary over several orders of magnitude (multiples or powers of 10) in terms of absolute voltage Dynamic range is the ability of a receiver to maintain a fairly constant output, and yet to maintain its rated sensitivity, in the presence of signals ranging from very weak to very strong The dynamic range in a good receiver is in excess of 100 dB Noise figure: The less internal noise a receiver produces, in general, the better is the S/N ratio Excellent S/N ratio in the presence of weak signals is only possible when the noise figure, a measure of internally generated receiver noise, is low This is paramount at VHF, UHF, and microwave frequencies Gallium-arsenide field effect transistors (GaAsFETs) are well known for the low levels of noise they generate, even at quite high frequencies Other types of FETs can be used at lower frequencies Bipolar transistors tend to be rather noisy Direct-Conversion Receiver A direct-conversion receiver derives its output by mixing incoming signals with the output of a tunable (that is, variable frequency) local oscillator (LO) The received signal is fed into a mixer, along with the output of the LO Figure 25-11 is a block diagram of a direct-conversion receiver For the reception of on/off keyed Morse code, also called radiotelegraphy or continuous wave (CW), the LO, also called a beat-frequency oscillator (BFO), is set a few hundred hertz above or below the signal frequency This can also be done in order to receive FSK signals The audio output has a frequency equal to the difference between the LO and incoming carrier frequencies For reception of AM or SSB signals, the LO is set to precisely the same frequency as that of the signal carrier This condition is known as zero beat because the beat frequency, or difference frequency, between the LO and the signal carrier is equal to zero A direct-conversion receiver provides rather poor selectivity That means it can t separate incoming signals very well when they are close together in frequency This is because signals on either side of the LO frequency can be heard at the same time A selective filter can theoretically eliminate this Such a filter must be designed for a fixed frequency if it is to work well But in a direct-conversion receiver, the RF amplifier works over a wide range of frequencies Superheterodyne Receiver A superheterodyne receiver, also called a superhet, uses one or more local oscillators and mixers to obtain a constant-frequency signal A fixed-frequency signal is more easily processed than a signal that.

--add some more test data DECLARE @cnt INT ; SET @cnt = 0 ; WHILE @cnt < 500 BEGIN SELECT @cnt = @cnt + 1 ; INSERT dbo.Test ( col1,col2,col3 ) VALUES ( @cnt ,'test row # ' + CAST(@cnt AS VARCHAR(10))

--insert additional rows DECLARE @cnt INT ; SET @cnt = 0 ; WHILE @cnt < 500 BEGIN SELECT @cnt = @cnt + 1 ; INSERT VALUES dbo.Test2 ( col1,col2 ) ( @cnt ,'test row # ' + CAST(@cnt AS VARCHAR(10)) ) ;

Navigation bar The navigation bar is the thin horizontal strip under the toolbar At its left end, the language pop-up menu lets you switch between AppleScript and other scripting languages that AppleScript Editor supports; normally, you ll want to leave this menu set to AppleScript To the right of the language pop-up menu is the elements pop-up menu, which you can use to select elements (such as variables or properties) that you ve defined in the script Until you select an element, the elements pop-up menu shows <No selected element>, as shown in the figure

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When we use the sys.dm_db_index_physical_stats DMV to examine the space used by the dbo.Test2 table, we find that the number of data pages increases slightly, indicating that the space once consumed by the dropped column was not automatically reused. Figure 9 shows the results.

Figure 2-1

If the space had been automatically reused, there should have been more than enough space to contain the additional 500 rows without having to add more space. But because the columns were only marked as no longer being part of the table in the metadata, there is no space to reuse. So SQL Server added additional pages to make space for the new rows.