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(c) /3 (d) /2 2 What is the approximate length, in meters (m), of a center-fed, /2 wire antenna at a frequency of 181 MHz Assume the velocity factor is typical for wire (a) 790 m (b) 829 m (c) 136 m (d) 259 m 3 What is the approximate height, in feet (ft), of a ground-mounted, /4 vertical antenna, made of aluminum tubing, at a frequency of 7025 MHz Assume the velocity factor is 92 percent (a) 6443 ft (b) 3222 ft (c) 1964 ft (d) 9822 ft 4 In order to obtain reasonable efficiency with a /4 vertical antenna mounted over poorly conducting soil at a frequency of 10 MHz, it is necessary to (a) make the antenna out of large-diameter aluminum or copper tubing (b) suspend the antenna from a kite or balloon (c) feed the antenna with a waveguide (d) minimize the loss resistance by installing numerous ground radials 5 A driven element in a parasitic array is (a) grounded for dc (b) a loop with a circumference of /2 (c) connected to the feed line (d) a straight length of wire 6 In a zepp antenna, feed-line radiation can be minimized by (a) using the antenna only at frequencies where its length is a whole-number multiple of /2 (b) using the antenna only at frequencies where its length is a whole-number multiple of /4 (c) using the antenna only at frequencies where its length is an even-number multiple of /10 (d) using the antenna only at frequencies where its length is an odd-number multiple of /4 7 Consider a single-turn, closed loop having a circumference of 95 ft Suppose this loop is circular, lies entirely in a single plane, is fed with open-wire transmission line and an antenna tuner, and is operated at 10 MHz The maximum radiation and response for this loop can be expected to occur (a) in the plane containing the loop (b) along a line perpendicular to the plane containing the loop.

Depending on the size of your database(s) and your infrastructure, you would probably be looking at several hours of downtime with a full backup/restore sequence You could also use log shipping to get your data from the old server to the new server You would need to change the old database to read-only before you switched to the new server, and then back up the tail of the log and restore it on the new server This would be more complicated to implement, but it would be low risk and have relatively short downtime (probably a few minutes) A much better solution would be to use SQL Server Database Mirroring to migrate from SQL Server 2005 on the existing server to SQL Server 2008 on a new server with a single relatively short outage This works well, is low risk, and is easy to implement..

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One caveat is that your SQL Server 2005 instance must be on Build 3215 (SP2 Cumulative Update 5) or better If you are on an older build of SQL Server 2005, you will not be able to establish a mirroring session with a SQL Server 2008 instance To use this method, you would install a fresh copy of Windows Server 2008 on a new server, get it fully patched and configured, then install SQL Server 2008, and get it fully patched and configured (including transferring logins and SQL Agent jobs) Then you would go though the normal steps to prepare the mirror full database backup, copy and restore with NORECOVERY, then log backups, copy and restore with NORECOVERY, until you were ready to create the endpoints and establish the mirror.

(c) along a line coinciding with the path of the feed line (d) equally in all directions in three-dimensional space 8 Suppose an antenna system has a radiation resistance of 40 at 85 MHz What is the efficiency of this system (a) 25 percent (b) 40 percent (c) 80 percent (d) Impossible to determine without more information 9 Suppose an antenna system has a radiation resistance of 40 and a loss resistance of 10 What is the efficiency of this system (a) 25 percent (b) 40 percent (c) 80 percent (d) Impossible to determine without more information 10 The null in a loopstick antenna exists (a) in the plane perpendicular to the coil axis (b) in the line that coincides with the coil axis (c) at a 45 angle with respect to the coil axis (d) nowhere, because a loopstick is an isotropic antenna 11 As elements are added to a properly designed Yagi antenna, (a) the forward gain decreases (b) the f/b ratio decreases (c) the f/s ratio increases (d) None of the above apply 12 When the radiation resistance in an antenna system represents most of the total system resistance, (a) the system can be expected to have high loss (b) the system can be expected to have high efficiency (c) the system can be expected to have a high f/s ratio (d) the system can be expected to have a high f/b ratio 13 What state of affairs is optimal in a waveguide (a) A colony of spiders inside (b) A cross-sectional measurement of less than /4 (c) Operation at frequencies below 3 MHz (d) None of the above