HT202663: Use Wireless Diagnostics to help you resolve Wi-Fi issues on your Mac
Learn about Use Wireless Diagnostics to help you resolve Wi-Fi issues on your Mac
Q: I do not have a Wireless Diagnostics Assistant entry in the drop down WIFI menu of my OS X 10.9.5I
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Oct 11, 2014 5:08 PMby steve626,HelpfulI suggest that you download iStumbler to survey WiFi networks in your area. Look for other networks that have (a) signal level and/or (b) signal/noise level that are comparable to your network. Also check the channel numbers. If one is at levels close to yours on the same channel, they might be interfering. Such interference can come and go. Changing to another channel might help. Other types of interference can come from microwave ovens, telephones, etc. Changing the location of your router might help with that.
There is one spot in the corner of my house where a neighbor's WiFi can actually be stronger than mine, once in a while.
You indicated that your situation changed shortly after updating to 10.9, but interference can come and go, so it's worth checking steadily over a hour or two (iStumbler makes a graph) to see if some interference appears. I've also noticed neighbors' networks regularly being created, gong away, changing etc.
Once you have eliminated interference, you can try some software things such as reseting your WiFi setup, deleting preference files, and the like.
