Problems trying to change frequency band on Airport Express

I'm trying to solve drop-out issues, when playing music from I-tunes etc over airport express connected to stereo, by changing frequency band and channel on my Time Capsule-router with Airport Utility.
My problem is that I changed it to 5Ghz, and when it restarted my Imac said it could not be found. My wireless network disappeared from Airport menu.
I could still see network it on my macbook, and Airport utility on macbook could also see it, apparently not registering any problem. However when I tried to connect to actually connect to wireless network I was asked for my password, which was then refused several times.
I was eventually able to able to access TC in Airport utility on my macbook by connecting to it by ethernet cable. I tried changing band to 2.4 Ghz, with same results (asked for password, which was refused).
Finally, when I restored original basic 8.2.11n setting, all returned to normal.
However, I'd like to try to solve my drop-put problems by remedies proposed elsewhere in forum, such as changing frequency band and channel. Does anyone know why I am having this problem changing frequency band and channel. My imac (which could not see TC on 5Ghs is pre-intel, mac-book has intel, both OSX 10.5.8.
Also, are there settings changes I can try to improve drop-out issue. I've heard of something called interference robustness, for example?

Thanks for reply. I tried again changing frequency to 2.4 as suggested, but the problem was the same. Airport Utility reports it cannot find device. Then, when I try to connect to wireless network anyway, a box comes up telling me to enter password. I do this and I get the message "connection failed".
Fortunately, I am able to wire my macbook into Time capsule by ethernet cable, and change it back to original setting, and all is well.
I did succeed in changing channel, but still on the 8.2.11n setting. However I would still have liked to see if I could improve drop-out issues by changing frequency band, if you have any more ideas about what could be wrong.

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Connect the AirPort Express (AX) to the cable modem via Ethernet cable.
In configuring the AX using AirPort Utility:
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Under AirPort>Wireless, set the Wireless Mode to Create a wireless network, and fill in the remaining settings in the same window. Until you get it working, you might want to set Wireless Security to None.

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You're welcome.
Voicemail is left at your carrier's server. That will continue to work unless you report your iPhone as lost or stolen with your carrier.
You may never find it again and you can't if the iPhone remains offline or out of service which means the iPhone is powered off or doesn't have cellular reception.

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When I select the Airport Express as Remote Speaker in Itunes I just see trying to connect and it can't connect.
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Is it possible to add / change frequency bands to ...

Now this question may, after I have all my information, well, it may appear foolish even to ask but I was curious. I am curious as to whether or not frequency bands can me added or modified on N series phones? Is this an issue of hardware updates or can it be solved through a firmware update?
I ask this since it seems that the GSM carriers of North America will have "their" frequency bands and despite the fact that the ENTIRE rest of the world (at least it seems that way to me...) is operating on a different set of frequency bands that they won't change for any reason.
Are they waiting for the rest of the world to go to their frequency bands of GSM? Or are they just loathe to change? Will they change their GSM frequencies when they go to a 4G network? Why are they different? Just to be different and/or stubborn?
I'm not trying to pick on them I'm just trying to understand the reasoning behind their choice of frequency bands which makes it more difficult for me and many others to get a good Nokia N-series phone? Could it be a fear of competition from outside phone manufacturers?
Solved!
Go to Solution.

It all comes down to what was available in the country at the time the system was developed. In Europe before GSM came along, each country had their own system (TACS, NMT, C-NET etc...) and own bands, but ITU tried to get all countries to harmonise, EU went further and made all countries clear a few bands of radio spectrum and work on a common system, hence GSM. Other countries though like USA had different band requirements due to historical usage by the millitary and other organisations and so couldn't reserve the same bands.
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This is very much a simple summary of 30+ years of cellular development.

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Hi, i have two mac minis which i am trying to connect to the internet via airport express to a modem. No problems with one of them, very reliable but i can't get the other to connect. It staes there is no ip address . This is when using the "configure ipv4 using dhcp" When i tried manually and copied the same address it appeared to work except it said that another computer was using that i.p address. (which is the one that always is working) Question is, cause i am a newbie, what ip address should i use? Thanks.....

bruthen wrote:
i have two mac minis which i am trying to connect to the internet via airport express to a modem. No problems with one of them, very reliable but i can't get the other to connect. It staes there is no ip address . This is when using the "configure ipv4 using dhcp" When i tried manually and copied the same address it appeared to work except it said that another computer was using that i.p address. (which is the one that always is working) Question is, cause i am a newbie, what ip address should i use?
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Problems trying to change frequency band on Airport Express

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