Installation guide

51
Installing the 7782 Access Point in the Field
Mounting External Antennas (7782-E Only)
Mounting and Connecting an External GPS Antenna
NOTE: If you are not connecting an external GPS antenna to the 7782-E AP, then make
sure that the metal cap remains installed and securely fastened to protect the interface
from elements, such as water and dirt.
After you have secured the metal cap, skip this procedure and continue with “Verifying
Access Point Operation” on page 52.
You can connect an external powered GPS antenna to the 7782-E AP, either with or without
a customer-supplied antenna extension cable. In all cases, make sure that the external GPS
antenna is powered by 3.3 VDC and that its current draw does not exceed 150mA. If you
are installing a customer-supplied antenna extension cable, then keep the cable short or
use low-loss cable to avoid excess signal attenuation.
CAUTION: Use only a powered external GPS antenna. Passive GPS antennas will damage
the GPS circuitry.
1. If the AP is powered, then disconnect the AP from the power source.
WARNING: Before connecting the GPS antenna to the 7782-E, make sure that you
disconnect the AP from the power source.
2. Unscrew the metal cap that protects the antenna connector. Place the metal cap in a
safe place, in case you need it later.
3. Connect the GPS antenna to the standard N-type female antenna connector on the
7782-E AP. Use a torque wrench to tighten the connectors to 1.58 N.m (14 in-lbs).
4. If the GPS antenna comes with an RF coaxial cable, then do the following:
a. Physically mount the GPS antenna outdoors with a clear view of the sky, preferably
on the same mounting structure as the AP. The GPS antenna must not be installed
where it can be covered with snow buildup to avoid attenuating the GPS signal.
b. Connect the RF coaxial cable to the standard N-type female connector on the AP.
Use a torque wrench to tighten the connectors to 1.58 N.m (14 in-lbs).
5. Apply weatherproofing tape to the antenna connector to help prevent water and dirt
from entering the AP.
You have completed connecting an external GPS antenna to the 7782-E AP. Continue with
Verifying Access Point Operation
.