probably more likely to be the PDA. No doubt cisco have their own proprietary utils for this purpose.
The cards will however freely switch modes as detailed below.
Quote:
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The client adapter scans for beacons and probe responses transmitted by the access point that contain country information. The client uses this information to set the frequency and transmit power levels for the regulatory domain in which it is operating.
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Not sure whether these beacons are a cisco access point feature only.