> ## Professional Installation

> All products using external antennas must be professionally installed, and the transmit power of the system must be adjusted by the professional installers to ensure that the system EIRP is in compliance with the limit specified by the regulatory authority of the country of application.

> See the following sections for more information:

> - Installing External Antennas
> - Adjusting Tx Output Power
> - Antenna Types and Maximum Gain
> NOTE: See Hardware Installation for cabling and mounting instructions.

> ## Installing External Antennas

> Only a professional installer can install external antennas on the AP-4000/4000M/4900M. For information on the AP's antenna functionality, see Antennas.

> Follow the mounting instructions included with your external antenna, and then connect the antenna cable to the AP, as follows:

> 1. Press down near the center of the compartment covering and slide open the external antenna access compartments. The compartment closer to the LED panel contains the connectors for the 802.11b/g radio, and the other compartment contains the connectors for the 802.11a radio.
> NOTE: AP-4000 models 8670-US2 and 8670-AU do not provide external antenna connectors for 5GHz (802.11a) operation.

> Figure F-1 Opening the Antenna Compartment
> 2. There are four antenna connectors in the AP-4000/4000M/4900M, labeled 1 through 4. Connectors 1 and 2 are for the 802.11b/g radio, and connectors 3 and 4 and for the 802.11a radio.Connect the antenna cable to connector 1 or 4 (the connector closer to the LED panel in the compartment), depending on the radio.
> NOTE: When the AP-4900M is configured to operate in 4.9 GHz Public Safety operational mode, antenna diversity is disabled by default, and antenna 3 is configured for use.

> Figure F-2 AP-4000/4000M/4900M Antenna Connectors
> 3. If installing a second external antenna on a radio (not recommended), connect the antenna cable to connector 2 (802.11b/g radio) or connector 3 (802.11a radio).
> 4. Close the external antenna access compartments.
> 5. If desired, manually select which antenna(s) to use through the Command Line Interface. See Configure Antenna Diversity.

> ## Attaching Antenna(s) to the AP-4900M for 4.9 GHz Operation

> To attach an external antenna to the AP-4900M, attach the selected antenna to the pigtail attachment connected to the AP's antenna connector 3 (see Figure F-3).

> For a list of recommended antennas, see http://www.proxim.com/products/wifi/accessories.

> Figure F-3 AP-4900M External Antenna Connection

> ## Adjusting Tx Output Power

> Use the following formula in combination with the table of EIRP limits in US and EU countries to calculate system transmit power (based on EIRP limits) of these countries:

> Tx Power (dBm) = EIRP Limit (dBm) + FL (dB) - G (dB)

> where:

> Tx Power = Output power measured at the antenna input

> EIRP Limit = EIRP limits specified below

> FL = Feeder loss including loss of connectors

> G = Antenna Gain

> Frequency (GHz) | Bandwidth (MHz) | EIRP Limit (dBm)
> USA | EU
> 2.4 - 2.4835 | - | 36 | 20
> 4.9 | 10 | 26 | NA
> 20 | 29
> 5.15 - 5.25 | - | 23 | 23
> 5.25 - 5.35 | - | 30 | 20
> 5.47 - 5.725 | - | 20* | 20
> 5.725 - 5.850 | - | 36 | 14

> ## Antenna Types and Maximum Gain

> For devices using external antennas, professional installers should select only the antenna types listed in the following table, with gain not exceeding the listed maximum gain for each type.

> Frequency Band | Antenna Type | Maximum Gain
> --- | --- | ---
> 2.4 GHz | Omni | 10
> Panel | 14
> Yagi | 14
> Parabolic | 24
> 5 GHz | Omni | 13
> Panel | 28.2
> Sector | 17
> Parabolic | 33.4
> 4.9 GHZ | No restriction | No restriction beyond EIRP compliance.

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