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Cisco IOS Software Configuration Guide for Cisco Aironet Access Points
OL-29225-01
Chapter 6 Configuring Radio Settings
Configuring Transmit and Receive Antennas
Short preambles are enabled by default. Use the preamble-short command to enable short preambles if
they are disabled.
Configuring Transmit and Receive Antennas
You can select the antenna the wireless device uses to receive and transmit data. There are three options
for both the receive and the transmit antenna:
• Gain—Sets the resultant antenna gain in dB.
• Diversity—This default setting tells the wireless device to use the antenna that receives the best
signal. If the wireless device has two fixed (non-removable) antennas, you should use this setting
for both receive and transmit. If the device has three removable antennas, you can use this setting to
have all of them operate in diversity mode
• Right—If the wireless device has removable antennas and you install a high-gain antenna on the
wireless device's right connector, you should use this setting for both receive and transmit. When
you look at the wireless device's back panel, the right antenna is on the right.
• Middle—If the wireless device has removable antennas and you install a high-gain antenna on the
wireless device middle connector, you should use this setting for receiving only. The antennas
available for transmitting in a three-antenna configuration are the right and left antennas.
• Left—If the wireless device has removable antennas and you install a high-gain antenna on the
wireless device's left connector, you should use this setting for both receive and transmit. When you
look at the wireless device's back panel, the left antenna is on the left.
Beginning in privileged EXEC mode, follow these steps to select the antennas the wireless device uses
to receive and transmit data:
Step 4
end Return to privileged EXEC mode.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface dot11radio {0 | 1} Enter interface configuration mode for the radio interface. The
2.4-GHz radio is radio 0, and the 5-GHz radio is radio 1.
The 802.11n 2.4-GHz radio is radio 0
The 802.11n 5-GHz radio is radio 1.
Step 3
gain dB Specifies the resultant gain of the antenna attached to the
device. Enter a value from –128 to 128 dB. If necessary, you
can use a decimal in the value, such as 1.5.
Note This setting does not affect the behavior of the wireless
device; it only informs the WLSE on your network of
the device antenna gain.