You may also see that the signal strength is marginal and that moving your wireless router may improve the Wi-Fi connection’s performance. You may find that whenever your wireless phone rings, the noise floor jumps up to squash the signal received, or maybe it happens when you’re microwaving pizza for lunch. With this near real-time graph, you can discover what’s causing your wireless connection to drop from time to time. The most useful function for most Mac users is the one that monitors signal strength and noise. For example, in OS X Lion, you can’t monitor signal strength while capturing raw frames. Not all of the functions can be used concurrently with some versions of the Wi-Fi Diagnostics app. You can use any one of the functions individually. (OS X Mavericks and later) Info: Provides text-based details about the Wi-Fi network you’re currently connected to, including the transmit rate, security protocol in use, channel, and band. In addition, the Scan function also suggests the best channels for you to use for your own Wi-Fi network, a helpful feature if you’re in a crowded Wi-Fi environment. Scan for Wi-Fi Networks: The scan function looks for all Wi-Fi networks in your general area and shows key information about each one, including strength, noise level, and channels being used. Turn on Debug Logs: Allows you to capture debug-level events occurring on your wireless network. Capture Raw Frames: Allows you to capture data sent over the wireless network, data sent or received by your computer over the wireless network, and data from any nearby network to which you have access rights. Record Events: Can log specific events, such as users connecting to or disconnecting from the Wi-Fi network. Also, generates a log of signal performance over time. Monitor Performance: Provides a near real-time graph of signal strength and signal noise.

The Wi-Fi Diagnostics app’s main functions are: To assist you, the app can perform some or all of the following functions, depending on the version of macOS or OS X you’re using. The Wi-Fi Diagnostics app is designed primarily to help users resolve Wi-Fi issues. Here’s how to use it with macOS Big Sur (11) through macOS High Sierra (10.13): What the Wi-Fi Diagnostics App Does # How you use Wireless Diagnostics on your Mac depends on your version of macOS or OS X. Using Wireless Diagnostics: macOS Big Sur Through macOS High Sierra #

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