E4200 router - can't see 5ghz

Question

I have e4200 router set up with different SSIDs for 2.4ghz and 5ghz.  My laptop (Lenovo x220 with Intel 6205 wireless adapter) can't see the 5ghz network.  I've tried changing the channel for the 5ghz network and it didn't fix the problem.
How do I fix?
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Answer 1

Thanks.  That program was useful.  I ran that program and saw only 24xxx kHz frequencies.
So I played around with some different settings and finally figured out how to fix.  If anyone else has this problem, here's how I fixed it (using Windows 7):
1.  Go to Control Panel -- Network and Internet -- Network and Sharing Center
2.  Click on Change adapter settings on the left side
3.  Right click on the wireless adapter and click Properties
4.  Click the Configure button that is right under the wireless adapter
5.  Click the Advanced tab
6.  Select the Wireless setting; mine was set to 802.11b/g; change it to 802.11a/b/g
That fixed the problem and I could see 5ghz networks.  For some reason, the adapter doesn't see 5ghz 802.11n networks unless it's looking for 802.11a networks - which is not intuitive.  (It also works if the Wireless setting is just 802.11a, but then it doesn't see 2.4ghz networks.)
So bottom line is that the default settings in the Lenovo system were not set up to see 5ghz - which is not cool.