User manual

Table 12 Transmission Loss (per 100 Feet)
Frequency Range
Cable Type
VHF
UHF
900 MHz
LMR-400
1.5 dB
2.7 dB
3.9 dB
1/2” Heliax
0.68 dB
1.51 dB
2.09 dB
7/8” Heliax
0.37 dB
0.83 dB
1.18 dB
1-5/8” Heliax
0.22 dB
0.51 db
0.69 dB
Outside cable connections should have a weather kit applied to each connection to prevent moisture. Feedline
connections should be routinely inspected to minimize signal loss through the connection. A 3 dB loss in signal strength
due to cable loss and/or bad connections represents a 50% reduction in signal strength.
2.6.6 RF EXPOSURE COMPLIANCE REQUIREMENTS
The Guardian radio is intended for use in the Industrial Monitoring and Control and SCADA markets. The Guardian unit
must be professionally installed and must ensure a minimum separation distance listed in the table below between the
radiating structure and any person. An antenna mounted on a pole or tower is the typical installation and in rare
instances, a 1/2-wave whip antenna is used.
Table 13 RF Exposure Compliance Minimum Safety Distances
Minimum Safety Distance
Antenna Gain
5 dBi
10 dBi
15 dBi
VHF at maximum power
123 cm
218.8 cm
389 cm
UHF at maximum power
105.7 cm
188 cm
334.4 cm
900 MHz at maximum power
63.8 cm
115 cm
201.7 cm
Note: It is the responsibility of the user to guarantee compliance with the FCC MPE regulations when
operating this device in a way other than described above.
The Guardian serial radio uses a low power radio frequency transmitter. The concentrated energy from
an antenna may pose a health hazard. People should not be in front of the antenna when the
transmitter is operating.
The installer of this equipment must ensure the antenna is located or pointed such that it does not emit an RF field in
excess of Health Canada limits for the general population. Recommended safety guidelines for the human exposure to
radio frequency electromagnetic energy are contained in the Canadian Safety Code 6 (available from Health Canada)
and the Federal Communications Commission (FCC) Bulletin 65.
Any changes or modifications not expressly approved by the party responsible for compliance (in the country where
used) could void the user’s authority to operate the equipment.
Guardian™ Serial Modem or Analog Radio for Licensed Spectrum PN 001-5006-000 Rev. 3 | Page 16