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ath9k Antenna Diversity

This page documents how antenna diversity is supported by ath9k.

What is Antenna Diversity ?

Adrian Chadd's excellent, detailed notes.

Supported cards

WLAN Only

• HB95
• HB125

WLAN and BT

• WB195
• WB225
• WB335

Enable WLAN/BT RX Antenna Diversity

This feature is available only on WB225 and WB335, not WB195. To enable WLAN RX diversity using the BT antenna, use the module parameter bt_antenna_diversity.

modprobe ath9k bt_antenna_diversity=1

This can also be turned on/off using the debugfs file bt_ant_diversity.

echo 1 > /sys/kernel/debug/ieee80211/phy0/ath9k/bt_ant_diversity
echo 0 > /sys/kernel/debug/ieee80211/phy0/ath9k/bt_ant_diversity