The 1100 and 1200 can be upgraded with the mini PCI radio card.
Also, the 1200
AP can be upgraded to 5 GHz.
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WARNING:
ESD can damage the Cisco Aironet radio and the internal components
of the access point. It is recommended that the 2.4-GHz radio upgrade
procedures be performed by an ESD-trained service technician at an
ESD-protected workstation.
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The following operations summarize the upgrade procedure for the
AP 2.4-GHz radio for the 1200.

| Step 1 | Remove all cables and power connections from the access point. |
| Step 2 | Follow standard electrostatic discharge (ESD) procedures. |
| Step 3 | Place the access point on an ESD-protected work surface. |
| Step 4 | Open the 2.4-GHz radio access cover of the access point. |
| Step 5 | For an access point without the 2.4-GHz radio feature, remove the blank
spacer card. |
| Step 6 | For an access point with the 2.4-GHz radio feature, remove the existing
2.4-GHz card. |
| Step 7 | Install the new 2.4-GHz radio card. |
| Step 8 | Close the access point 2.4-GHz radio access cover. |
Once the 802.11g chip is available, follow the process above to swap
the chips. Unlike the access cover on the 1200, the 1100 case must be removed.

The
following operations summarize the upgrade procedure for the 5 GHz radio module
on the AP 1200. 
| Step 1 | Remove all cables and power connections from the access point. |
| Step 2 | Place the access point on a flat surface. |
| Step 3 | For an access point without the 5 GHz radio feature, remove the 5-GHz radio
access cover. |
| Step 4 | Install the new 5 GHz radio module. |