Transmitting 50% of the time, or less, is important because the radio generates measurable RF energy exposure only when transmitting (in terms of measuring standards compliance).
Exposure to Radio Frequency Energy
Your Motorola radio is designed to comply with the following national and international standards and guidelines regarding exposure of human beings to radio frequency electromagnetic energy:
•United States Federal Communications Commission, Code of Federal Regulations; 47 CFR part 2
•American National Standards Institute (ANSI)/ Institute of Electrical and Electronic Engineers (IEEE) C95.
•Institute of Electrical and Electronic Engineers (IEEE)
•International Commission on
•Ministry of Health (Canada) Safety Code 6. Limits of Human Exposure to Radio Frequency Electromagnetic Fields in the Frequency Range from 3 kHz to 300 GHz, 1999
•Australian Communications Authority Radiocommunications (Electromagnetic Radiation - Human Exposure) Standard 2001 (applicable to wireless phones only)