802.11n extend network multiple times

I have a 2GB Time Capsule and 3 Airport Express airports. The TC is configured to "Allow this network to be extended" and all 3 Airport Expresses are configured to "Extend a Wireless Network." Even though all three expresses are close enough to connect to the TC only one will do so. The other two expresses connect to the first. Even though all three expresses are configured to "Allow wireless clients", only the express that connects to the TC will do so. The other two expresses will not allow a wireless connection even from a computer only two feet away from them. Am I trying to do something that is not supported by 802.11n?
Thanks for any information - Glenn

Welcome to the discussions, Glenn!
Think of Apple's "extend a wireless network" feature as if the Time Capsule were the hub of a wheel and the Express devices were located at the end of separate spokes. The remotes connect directly to the hub...they do not connect to each other.
Check your settings again to make sure that you have the base station and remotes configured correctly.
The Wireless Mode on the Time Capsule should be set to "Create a wireless network" and the box below that to "Allow this network to be extended" should be checked. That's it for the Time Capsule.
Configure each Express separately, only powering on the device that you need to configure. It may help to temporarily connect an ethernet cable from your computer to the Express to help with the configuration.
For each Express, you can configure it using the Manual Setup option on AirPort Utility. Click the Wireless tab for the setup page. Wireless Mode would be "Extend a wireless network". If you don't see this choice, hold down the option key on your computer as you click on the selection box. You will select the network that the Time Capsule is creating, enter the password, etc. Make sure that there is a check mark next to "Allow Wireless Clients".
Other than naming each Express, (make sure each Express has its own name), setting up the passwords, etc., that should be it for the Express setup.
In general, a good starting point for the position of the Express is to place it at a point that is approximately 1/2 to 2/3 of the distance between the main router and the area to be covered.
For more info on the setup, refer to the Designing AirPort Networks guide, pages 43-44. Please post back on your progress.
http://manuals.info.apple.com/enUS/Apple_AirPort_NetworksEarly2009.pdf

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