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Helpful answers
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Mar 10, 2015 4:36 PM in response to Skye Simakby MrHoffman,No answers, just some questions about your setup...
- Are other computers having the same problem with the same WiFi, or are the other computers working correctly?
- Are there other computers near your WiFi?
- Are you in a location that might or does have many WiFi networks in use, and possibly conflicting channels?
- If your WiFi router is capable of it and not already using 5 GHz WiFi, can you switch it to 5 GHz WiFi only?
- Does your Mac work correctly on other WiFi networks you might visit?
- Does a wired connection into the internet have the same problems; is this a general problem with your connect, or only with the WiFi?
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Mar 10, 2015 6:04 PM in response to Skye Simakby BobHarris,How to check if there are other WiFi base stations near by
Option-Click on the WiFi icon in your menu bar -> select Open Wireless Diagnostics
Enter your Admin password when prompted.
Wireless Diagnostics -> Windows -> Utilities -> Wi-Fi Scan tab
Click [Scan Now] button in the lower right corner.
You may want to grow the window to see all the columns
The WiFi base station and channel your Mac is using will be "Bold" and all the other WiFi signals will be normal type.
You are interested in the RSSI column and the Noise column
The smaller negative value the stronger signal. -37 is the strong signal in my house. My nearest neighbor is -77. In an appartment/condo complex you may have signals as strong or stronger than your signal.
The Noise signal should be a large negative value. -88 to -90's indicates a very small amount of noise. Noise is an indication of interference. A large negative value indicates very little noise.
Channels should not overlap. The 2.4GHz channels should be 5 channels apart. 1, 6, and 11 are the preferred channels in countries that allow 1-11. Some countries allow 1-13. So you want to look for in use channels with a small negative RSSI values that are less than 5 channels away from your 2.4GHz channel.
The 5GHz channels are assigned without any overlap, so they should not be a problem.
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Change of subject
Sometimes Bluetooth interferes with the 2.4GHz WiFi. If you are using Bluetooth devices, try turning off Bluetooth on your Mac. This is an experiment.
Microwave ovens use 2.4GHz. If your computer or your WiFi base station is picking up microwave oven leaking, then that can cause interference (the Noise above). The reason WIFi is allowed to use the 2.4GHz frequencies is because that band if fill with too many interfering signals, such as Microwave ovens.
2.4GHz cordless phones. Yours or ones owned by your neighbors (assuming your neighbors are nearby, such as row homes, apartments, condos, etc... can interfere with 2.4GHz WiFi
2.4GHz baby monitors are worse than 2.4GHz cordless phones, because baby monitors run all the time. So if you are using, or a nearby neighbor is using a 2.4GHz baby monitor, that could be a problem.
Buildings with metal framing. Concrete with rebar, or some builders use metal studs. These can block WiFi signals.
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Mar 10, 2015 6:07 PM in response to Skye Simakby David Shanahan,Try this and see if it helps: Wi-Fi: How to troubleshoot Wi-Fi connectivity - Apple Support
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Mar 11, 2015 8:45 AM in response to Skye Simakby Eric Root, -
Jan 30, 2016 4:35 PM in response to Skye Simakby pe1,Try checking SYSTEM PREFERENCES, ENERGY SAVER settings.
Make sure it’s set (at least when on power) so that computer never sleeps and that hard disks don’t sleep.
This can cause a disconnect from wifi if the computer or hard disks go to sleep. It should automatically reconnect when you “wake” it, but if you want it to continue updating apps, iTunes, etc. in background when you’re not actively using the computer, you don’t want it to disconnect when it goes to sleep.
This is only one solution that addressed my problem with this issue. There may be other reasons for the issue.