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I have two adapters, one has the Atheros AR9002WB-1NG and the other is a LAN USB Adapter #4. For some reason or the other they both can't detect 802.11a connections. Can someone explain this to me?

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What OS are you using? Are you using the driver & the default OS utility to configure the network, or are you using the utility included with the drivers? – Breakthrough May 2 '13 at 13:43
Your LAN USB Adapter is unlikely even a wireless adapater based on the name. – Ramhound May 2 '13 at 14:39
up vote 5 down vote accepted

For the one it is obvious: the AR9002WB-1NG is a 2.4GHz-only chipset, so it cannot see the 802.11a network which operates at 5GHz.

As for the LAN USB Adapter #4 - it won't be possible to tell if it supports 5GHz unless you can find out the chipset, but I suspect it's also 2.4GHz only since you say it can't detect your 802.11a network either.

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