Part 15 with a particular antenna attached can exceed the Part 15 standards if a different
antenna is attached. Should this happen it could pose a serious interference problem to
authorized radio communications such as emergency, broadcast, and air-traffic control
communications.”
In order to comply with the FCC RF exposure requirements, the RF451/RF452 may be used only
with approved antennas that have been tested with this radio and a minimum separation
distance of 23 cm (9 inches) must be maintained from the antenna to any nearby persons.
16. Electrostatic issues
Many RF451/RF452 installations are outdoors and, therefore, susceptible to lightning damage,
especially via the antenna system. Also, depending on climate and location, electrostatic-charged
wind can damage sensitive electronics, if sufficient electric charge is allowed to accumulate on
the antenna and cable. To protect against this, Campbell Scientific offers Antenna Surge
Protection Kits.
Antenna surge protection is recommended in the following applications:
l
When the antenna cable length exceeds 10 feet
l
When use of COAXRPSMA cable would result in too much signal loss
l
When the radio will be used in an environment susceptible to lightning or electrostatic
buildup
17. Troubleshooting
17.1 LED status
The RF451/RF452 has two red/green/orange LED status indicator lights.
(p. 24) and
(p. 24) show the status of each light when the RF451/RF452 is in various states of
communications.
RF451/RF452 Spread Spectrum Radio
23
