iv
RF Exposure Warning
To ensure optimal transceiver performance and to avoid exposure to excessive
electromagnetic elds, the antenna system must be installed according to the
instructions provided.
High voltages exist on the antenna during transmission and tuning. Do not
touch the antenna during these activities. RF burns may result.
Install the grounding system or counterpoise as directed to prevent RF burns
from any metal part of the transceiver.
Safe working distance is based on continuous exposure to CW type transmis-
sions, as set out in the ICNIRP Exposure Guidelines (1998) for occupational expo-
sure. Safe working distance can be reduced with normal voice communication.
For IC and FCC compliance, when the PRC-4090 transceiver is used at a power
level of 150 watts PEP and a 13 dBi gain antenna, the antenna(s) used with this
Transceiver should be located at least 6 metres from the operator and should
not be co-located or operating in conjunction with any other antenna or trans-
mitter.
For IC and FCC compliance, when the PRC-4090 transceiver is used in a vehicular
environment at a power level of 150 watts PEP with 1.5 dBi gain antenna, the
antenna(s) used with this transceiver should be located at least 1.6 metres from
the operator and should not be co-located or operating in conjunction with any
other antenna or transmitter.
Typical antenna types and minimum separation dis-
tance:
Antenna type Gain
(dBi)
PEP
(W)
Minimum safe sepa-
ration distance (m)
Typical
Environ-
ment
Automatic tuned and whip 0 150 1.3 Vehicle
Magnetic Loop 1.5 150 1.6 Vehicle
Multi-wire Broadband 5 150 2.4 Fixed
Log-Periodic 13 150 5.9 Fixed
Automatic tuned and Whip 0 100 1.0 Vehicle
Magnetic Loop 1.5 100 1.2 Vehicle
Multi-wire Broadband 5 100 1.8 Fixed
Log-periodic 13 100 4.4 Fixed
Automatic tuned and Whip 0 30 0.5 Vehicle
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