Heli-Coder 4 Transmitter Operation Manual | Doc. No. 6051452100 Rev. C
Broadcast Microwave Services, Inc.
2
2 SAFETY
WARNING- RF Hazard: Non-Ionizing RF Emission
Operators of this equipment should be familiar with basic RF equipment operation and safety concepts. Users
must consider many unique factors to maintain RF safety. We offer the following guidelines with the
recommendation that each individual and organization establish an RF Safety and Awareness program based on
their combination of hardware and usage environment.
Radiation Exposure
The frequencies present in BMS equipment produce non-Ionizing radiation. The FCC reference document
regarding RF exposure limits is OET Bulletin 65 and can be viewed by visiting the FCC web site (
www.fcc.gov
) or
by clicking here;
http://www.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet65/oet65.pdf
(Link valid as of 6/25/2012)
We also reference EU Standard EN 50392 (02-2004). BMS references these standards as reasonable guidelines.
The OET 65 document sets maximum permitted exposure (MPE) and is widely cited within the U. S. and Canada.
Exposure is divided into two categories, “controlled” and “uncontrolled” environment. The uncontrolled
environment is the harshest criteria and applies to exposure where you may not be aware and/or cannot control
the exposure. Examples are where a residence is located near a cell site or other radio tower. You live there,
cannot remove yourself from the field and cannot control the RF. Exposure is long term and not in your control.
The “controlled environment” applies to most professional radio users. It is assumed they are trained in RF Safety,
they are aware there is an RF field, exposure is limited by transmission duty cycles, the flight or testing ends, hang
up the cell phone, put up the walkie-talkie, etc.
BMS recommends that operators use the uncontrolled exposure category from OET 65 as it applies to an
uncontrolled environment;
a maximum power density limit of 1mW/cm².
The limit table from Bulletin 65 is reproduced below. X axis is frequency and y axis is mW/cm².
