For most of us, Wi-Fi has become our preferred way to connect our Macs to other networked devices and the Internet. However, most of us also have times when those connections slow down or fail altogether. When that happens, however, there are several things you can do to diagnose and (ideally) fix the problem.

Signal and noise

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The thing to remember about Wi-Fi is that it’s a form of radio: Signals are passed to and from your Mac and your router (and any other networked devices) by transmitters and receivers at both ends tuned to the same frequency. While the information being sent might be digital in nature, the medium it rides on is analog. As such, the ability to transmit and receive data via Wi-Fi is dependent on two things: the strength of the signal between those transmitters and receivers; and the volume of interference—unusable “noise”—from other devices using that same frequency.

Farm accounting program for mac. The analogy is to listening to the radio in your car: Sometimes, the signal gets weaker as you drive farther away from the station’s transmitter. Other times, even if the signal is crisp and strong, you might hear two different stations—one you want to listen to, one you don’t—on the same channel; that’s noise.

Your Mac’s ability to maintain a good Wi-Fi connection is a function of both of these signal types: If the signal from your router to your computer is too weak or if there’s too much noise from competing signals, then—as with your car radio—your Mac will lose its ability to make sense of what it’s “hearing.”

You can see all this activity in real-time using OS X’s built-in Wireless Diagnostics utility (/System/Library/CoreServices/Applications/). Open this utility and choose Utilities from the Window menu. In the panel that then appears, open the Performance tab. You should see two graphs: One showing the signal and noise levels, another showing the ratio of the two (a common way to determine relative strength). (The levels measured in that first graph are negative because they’re based on the logarithms of values between 0 and 1, and such logarithms are negative.)

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In general, for the signal measurement you want to see values of -10 to -70 dBm (decibel-milliwatts); for noise, -80 to -100 dBm. As the levels of the signal and of the noise get closer to one another, your wireless connection will begin dropping data packets and requiring that they be resent. This will slow down data transmission, and potentially cause your Mac to drop its connection altogether.

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The power of place

If you are having problems with your Wi-Fi connection, and you’ve checked Wireless Diagnostics, the numbers there (and the radio analogy above) should give you some clues about how to fix the problem. One of the most fundamental things you can do is change the position of your Mac, your router, or both.

Move closer to your router As you move your Mac farther from your router, signal strength will decrease. Therefore, try moving closer to your router until you see the signal graph on the Wi-Fi monitor move higher.

Get away from obstructions Large metal objects, window coatings, wires and pipes in walls, and other electrical devices can either block your Wi-Fi signal and decrease its quality, or introduce noise. Therefore, try moving to a new location, away from such obstructions, to see if this improves your signal.

Increase your router’s radio strength Some routers have options for changing radio power, which can not only help increase the quality of the signal your Mac receives, but also increase your router’s range. If you have this as a configuration option for your router, then try setting it to its maximum.

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Draw a map One useful approach for assessing poor signal issues is to map the Wi-Fi quality of your home or business. To do this, you can use a program like NetSpot, in which you can draw a scale plan of your building, and then move your Mac (provided it is a laptop) to various locations and chart the measured signal qualities at each one. You can then see if the signals drop off smoothly with the distance from your router (as you’d expected) or if there are any dead spots where signal quality falls off unexpectedly. In doing so, you can see if specific walls or rooms contain hidden shields that could be blocking the signal, and then be able to situate yourself and others accordingly.

Software and hardware issues

Even if you’ve done all of the above, you may still have trouble with slow or lost connections. These can be the results of software or hardware problems in your Mac or in your router. https://browntrainer.amebaownd.com/posts/18201296. Diagnosing these problems can be daunting, sometimes futile, but you can generally fix or at least help the situation by performing one or more of the following:

Reset your router by turning it off, unplugging it for a minute or two, and then turning it back on.
Change your router’s channel or radio, if your router allows you to do so.
Upgrade your router’s firmware.
Disable and then re-enable your Mac’s Wi-Fi connection using the Wi-Fi menu.
Upgrade OS X to the latest version if you have not already done so.
Run Apple’s hardware tests; if any errors crop up (especially anything pertaining to networking and Wi-Fi), you can then investigate them further.
Try a new network location by going to the Network system preferences and then choosing Edit Locations from the Location menu, followed by clicking the plus button to create and name a new location. This will populate the new connections list with all of the current networking hardware ports, and give them new configurations to work with.
Clear your Mac’s network configuration by going to the /Macintosh HD/Library/Preferences/SystemConfiguration/ folder and removing the following configuration files: NetworkInterfaces.plist; com.apple.airport.preferences.plist; com.apple.network.identification.

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