Campbell Scientific RF401-series and RF430-series Spread Spectrum Data Radios/Modems - Manual (Page 33)

RF401-series and RF430-series Spread Spectrum Radio/Modems
4.5 Antenna Cables and Surge Protection
4.5.1 Antenna Cables
The 14201, 14203, 14205, 14221, and 16755 antennas require an antenna
cable; either (1) the COAXRPSMA or (2) the COAXNTN with surge protector
(see FIGURE 4-9 and FIGURE 4-10). Indoor omnidirectional antennas are
either supplied with an appropriate cable or connect directly to the radio.
4.5.2 Electro-static Issues
Many radio installations are out of doors and therefore susceptible to lightning
damage, especially via the antenna system. Also, depending on climate and
location, electro-statically charged wind can damage sensitive electronics if
sufficient electric charge is allowed to accumulate on the antenna and cable.
To protect against this CSI offers the Item # 14462 Antenna Surge Protection
Kit.
The COAXNTN-L cable is a low-loss RG8 coaxial cable that requires the
14462 surge protector in order to connect to the radio. The RG8 / Antenna
Surge Protector are recommended in preference to the COAXRPSMA in the
following applications:
• When the antenna cable length exceeds 10 feet
• When use of COAXRPSMA would result in too much signal loss (see
page H-3)
• When the radio will be used in an environment susceptible to lightning or
electro-static buildup
4.5.3 Antenna Surge Protector Kit
The Surge Protector Kit for the RF401 and RF430 radios includes the
following:
• Polyphaser protector
• 18 inches of COAX RPSMA to connect the ‘tail end’ of surge protector to
the RF401 or RF430
• Ground wire lead
• Screw and grommet to secure ground wire and polyphaser to backplate of
enclosure
The surge protector has female type N connectors on both ends; one for
connection to the COAXNTN-L cable and the other for connection to the 18
inch length of COAXRPSMA cable included in the kit. The COAXRPSMA
cable is an LMR195 type that terminates in a type N Male connector on the
‘antenna end’ and a Reverse Polarity SMA (RPSMA) connector on the radio
end.
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