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Electrical versus RF Ground Electrical grounding is important for personal safety It can help protect equipment from damage if lightning strikes in the vicinity It also minimizes the risk of electromagnetic interference (EMI) to and from radio equipment In a three-wire electrical system, the ground prong on the plug should never be defeated, because such modification can result in dangerous voltages appearing on exposed metal surfaces A good RF ground system can help minimize EMI, even if it is not necessary for efficient antenna operation Figure 27-5 shows a proper RF ground scheme (A) and an improper one (B) In a good RF ground system, each device is connected to a common ground bus, which in turn runs to the earth ground through a single conductor This conductor should be as short as possible A poor ground system contains ground loops that can act like loop antennas and increase the risk of EMI Radials and the Counterpoise With a surface-mounted vertical antenna, there should be as many radials as possible, and they should be as long as possible They can lie on the surface or be buried a few inches underground The greater the number of radials of a given length, the better the antenna will work Also, the longer the radials for a given number, the better The radials should all converge toward, and be connected to, a ground rod at the feed point A counterpoise is a means of obtaining an RF ground or ground plane without a direct earthground connection A grid of wires, a screen, or a metal sheet is placed above the surface and oriented horizontally, to provide capacitive coupling to the earth This minimizes RF ground loss Ideally, the radius of a counterpoise should be at least /4 at the lowest operating frequency

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If you want automatic failover, you must have a witness instance, which should be on the same build of SQL Server as the principal and mirror You also should standardize on common drive sizes, drive letters, and paths for certain SQL Server uses, such as data files, transaction logs, tempdb, backups, and so on For example, you might decide to use P:, Q:, R:, and S: for data files; L: for your transaction log; T: for tempdb; and G: and H: for database backups, for both the principal and mirror sides of the mirroring partnership This is important, because if you decide to add a new data file to your principal, the G: drive, for example, but there is no identical drive letter and path on the mirror, your database mirroring state will be suspended (and the transaction log will not be truncated) until you correct the situation.

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Backup drives should also have the same drive letters, because if you end up running on the mirror hardware for an extended period, you would want to be running your normal full and transaction log backup routine on the mirror side (which is now the principal) Having identical drive letters and paths makes this much easier Even though tempdb cannot be mirrored, you still should include it in your drive letter standardization efforts, for consistency s sake, because that will help you make sure that both instances are configured identically..

The power gain of a transmitting antenna is the ratio of the maximum effective radiated power (ERP) to the actual RF power applied at the feed point Power gain is expressed in decibels (dB) Suppose the ERP, in watts, for a given antenna is PERP, and the applied power, also in watts, is P Then the following equation holds: Power gain (dB) = 10 log10 (PERP/P) Power gain is always measured in the favored direction or directions of an antenna These are the directions in which the antenna performs the best For power gain to be defined, a reference antenna must be chosen with a gain that is defined as 0 dB This reference antenna is usually a /2 dipole in free space Power-gain figures taken with respect to a dipole (in its favored directions) are expressed in units called dBd The reference antenna for power-gain measurements can also be an isotropic antenna, which theoretically radiates and receives equally well in all directions in three dimensions In this case, units of power gain are called dBi For any given antenna, the power gains in dBd and dBi are different by approximately 215 dB: Power gain (dBi) = 215 + Power gain (dBd)

Using database mirroring to become a superhero!

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