![Funk-Electronic Piciorgros RTU-81 User Manual Download Page 20](http://html1.mh-extra.com/html/funk-electronic-piciorgros/rtu-81/rtu-81_user-manual_2346370020.webp)
Funk-Electronic Piciorgros GmbH
RTU-810
V2.30 - Page 20 of 126
2.2.7
Connecting the Antenna
A BNC socket is provided for connecting the antenna. Ensure that the antenna is
selected correctly for the operating radio frequency. The antenna cable (50 ohm) should
not be longer than 5 meters, and should be good quality low-loss type (RG-213 or
Aircell).
Overvoltage protection suitable for protecting the modem is available. This should be
attached to the modem using a feed through bush (see diagram). Ensure that the
modem's grounding point, antenna input lightning protection, and the antenna system
are connected to a common grounding point.