Wireless connectivity issue between MacBook Pro/ iTouch and Airport Express

I'm creating a wireless network at home using my airport express and depending on the configuration settings I set in the airport utility, I will face the following issues:
1- To connect my MacBook Pro to the wireless network created, I have to set the radio mode to 802.11n only (5 GHz). Any other radio mode (a/b/g compatible or n only (2.4 GHz)) will not work ("Couldn't find the network")
2- Conversely, the use of the radio mode 802.11n only (5 GHz) with my iTouch doesn't work ("Couldn't find the network"). To connect my iTouch to the wireless network created, I have to set the radio mode to 802.11a/b/g compatible or to n only (2.4 GHz)
As a result, I manage to 1) either connect to a wireless network created with my airport express with my MacBook Pro only 2) or with my iTouch only, depending on the configuration setup.
I'm using the latest updates for the airport utility (7.4.2), iTouch (3.1.3) and Mac OSX (10.6.4).
Any help on this?

if you set it to the most compatible with the least common denominator you should be able to connect with both. (If that's what I understand you are trying to achieve).

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I hope this helps some of you out there.
I was having all the usual problems with connectivity with the MacBook Pro I bought in January 09. It dropped the signal constantly and if I closed the top, it would make me search for my network again then it would give me the "connection timeout message" over and over again. I couldn't get anything done either at home or anywhere else. I finally took it in to the genius bar but they couldn't replicate the problem so I was sent home. The guy did, however, suggest reinstalling the OS (which I thought was a dumb idea since it had to be the airport card right?). Since it was a week away from the release of Snow Leopard I waited.
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Nope I'm not trying to tether. I would like to be able to use a wifi connection on my mac and other devices. I've gotten by so far just hooking up my mac to the ethernet port, but that requires me to be in my room. I know its possible since there a bunch of networks nearby (locked of course), but I just can't figure out how to get mine working.
I'm living in an apartment across the street from campus that is sort of school-owned...well its private but the internet service is provided by the campus since only students live here. So we have to register anything that we want to use on the school's network. On campus I can use wifi on my mac or iphone. Its troubling how I can use the ethernet cable just fine, but when I connect it to my router (which I registered through the school as well)...nothing. Technically this should be working easily - but maybe you're right on the network security accessability...or maybe my router is old...or my mac doesn't like my router? I've had this problem before during my undergrad years except I was dealing with a cable provider and not the school.
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new house, waiting for DSL to be installed, 2-3 month wait.
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Nope I'm not trying to tether. I would like to be able to use a wifi connection on my mac and other devices. I've gotten by so far just hooking up my mac to the ethernet port, but that requires me to be in my room. I know its possible since there a bunch of networks nearby (locked of course), but I just can't figure out how to get mine working.
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