User's Manual

Broadcast Microwave Services Inc.
12367 Crosthwaite Circle, Poway, CA 92064-6817
Phone: [phone]. Toll Free: 800-669-9667. Fax: [phone]. Web: www.bms-inc.com
1
WARNING!
RF RADIATION EXPOSURE HAZARD
This warning is provided by Broadcast Microwave Services (BMS) Inc. for safety purpose.
The following information help to reduce the risk of RF exposure hazard.
FCC Limit of RF Exposure
According to Federal Communication Commission (FCC), the Maximum Permissible
Exposure (MPE) for FR radiation has been set to 1.0 mW/cm
2
for the 6 GHz Carry-
Coder II with 190 mW output power (OET Bulletin 65).
The 6 GHz Carry-Coder II is a non-broadcast transmitter and without an antenna it will
not create RF exposure (power density) exceeding the 1.0 W/cm
2
FCC limit.
However a high-gain antenna such as a parabolic dish will greatly enhance the 6 GHz
Carry-Coder II output power density beyond the MPE limit of 1.0 mW/cm
2
.
In this situation a minimum distance from the antenna needs to be calculated in order to
keep the MPE always below the safety limit. The calculation has been done for 6 GHz
Carry-Coder II based on the formula mentioned in OET Bulletin 56.
The calculations have been done for different commonly used antenna in the Public
Safety/ Law enforcement applications.
Figure 1 shows the plot of the minimum exposure distance for 5dBi, 16dBi, and 30dBi
antennas. The 6 GHz Carry-Coder II transmits the maximum power of 190 mW. The
minimum exposure distances are found from the cross points of the exposure graphs
(for various antennas) with the line of maximum permissible exposure (i.e. 1 W/cm
2
).
Notice that the numbers in Figure 1 predict the worse case scenario, which is straight in
front of the antenna (exposing to the antenna main-lobe). Obviously the side-lobe
exposures are well below these numbers as the radiation intensity dramatically reduces
on the side lobes.
"The antenna used for this transmitter must not be co-located or operating in conjunction
with any other antenna or transmitter."