46: Authoring Reports with Reporting Services. . . . . . . . . . . 1005 in .NET

Drawer pdf417 2d barcode in .NET 46: Authoring Reports with Reporting Services. . . . . . . . . . . 1005

The PDP is a function, but for obtaining a quick overview of measurement results, it is preferable to have each measurement campaign described by a single parameter . While there are a large number of possible parameters, normalized moments of the PDP are the most popular. We start out by computing the zeroth-order moment i.e., time-integrated power: Pm =

4

Aperture is measured in f-stops and is written as f/2.8, f/3.5, f/4, f/5.6, f/8, f/11, and so on. The larger the f/number (f/22), the smaller the opening allowing less light to reach the sensor. The smaller the number (f/2.8), the larger the opening allowing more light to reach the sensor. Essentially, an f-stop is a unit of change. For example, when changing by whole stops, f/5.6 lets in half as much light as f/4, and f/2.8 lets in twice as much light as f/4. Although changing the f-stop results in more or less light getting through the lens, this action has other consequences as well, as explained in the following list.

Parts List Connector. An N-series female chassis-mount connector is required that permits insertion of a brass stub wire. This is the most expensive part of the antenna. A modified coaxial cable assembly is required for use with the Cantenna. One side of the coax cable will have the male end of the N connector while the other end of the coax contains an appropriate plug for interfacing to the wireless equipment. An illustration of N-series female chassis-mount connectors is shown in Figure A.27 with the location where the brass stub wire is to be soldered. Nuts and Bolts. A #6 1 -in. screw (bolt) with a #6 nut is required only during the 4 drilling stage when one uses the flange mount connector shown on the left side of Figure A.27. If the N-connector is a screw-on type with integral nut, use of additional mounting hardware is not required. Wire. This requires approximately 1.25 in. (3.18 cm) of 12 AWG solid copper wire. This wire will be inserted into the brass stub in the N-connector and soldered. Tin Can. The most difficult part of the project is finding a tin can between 3 and 3-2 in. (7.6 9.3 cm) in diameter. The size does not have to be exact. Excellent 3 antennas work with cans that are approximately 40 oz in size and 6 in. (15.2 cm) diameter. Try to use a tin can that is longer in length that diameter. Old fashioned fruit juice cans work well. Figure A.28 illustrates various cans that may be used. Be advised that the MJB can in the figure performs best, while the Pringle s potatoes chip can provides poor performance due to the nature of the metallic coating used inside the can. Drill or Punch Holes in Can to Mount Probe. The N-connector assembly must be mounted in the side of the can. The placement of the hole and connector is critical. The location of the hole is derived from formulas commonly used in the design of microwave antennas: Cutoff frequency in MHz for TE11 mode: 6917.26/(diameter of can) inches Cutoff frequency in MHz for TE01 mode: 9034.85/(diameter of can) inches Guide wavelength: 11,802.85/ 5,938,969 (TE11 TE01) inches 1 4-guide wavelength: wavelength 0.25 3 4-guide wavelength: wavelength 0.75

(4.80)