Airport cards on both iMac and AppleTV require 'disabling' to get Full N

Both my iMac and my AppleTV will initially connect to my Base Station Extreme (N) at 130Mbit, even though the Base Station is set to 5GHz. If I disable the airport card on my iMac and re-enable it to re-establish connection I go up to 270Mbit. Same with the AppleTV.
This seems to happen consistently. Has anyone else come across this and is there a fix?

Mark, first welcome to the discussions.
There are so many things that could cause your problems.
More often than not doing a Software update, can cause loosing all sorts of things, for various reasons.
Here is a link that tells some recommended steps to follow to keep things like you have expierianced from happening.
http://discussions.apple.com/thread.jspa?messageID=607293
If I may suggest, I have found that sometimes a complete System Reset will work.
1st turn off your computers.
2nd Pull the Powere Adapters from both your Internet Service Providers Modem, and your Router.
Next you wait for 5 or so minutes.
After your wait start buy plugging in your Internet Service Providers Modem, and wait for it to re-gain the lights and your signal.
After you Modem has regained the signal and the lights, then you can plug back in your Router, and again you have to wait untill it regains the lights and signal on your Router.
Now if you haven't changed any of your settings you can restart your computers one at a time, and each computer should re-acquire the signal and should work.
http://discussions.apple.com/thread.jspa?messageID=607596
Here is yet another link that has some really good information and can be usefull for you and others
Good Luck. Don

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