Warning Concerning Radio Exposure

🚨 Warning! 🚨

This is an important message for users of radio equipment!

When setting up a radio rig, especially in the UHF range and higher, please take the necessary health precautions as recommended by the FCC! Failure to do so can result in PERMANENT DAMAGE TO SOFT TISSUE ESPECIALLY THE EYES!

To see if you are within the proper power limits, you first need to consider the gain of your antenna in the direction where people will be. This includes in front of behind, left and right, above and below. You also need to know the loss of your cable and the power output of your radio/amplifier. This is a good calculator for measuring your cable's loss. Once you know the power output going into the antenna. Refer to your antenna's documentation or find a good reference point based on your antenna's design and specifications for gain in the direction you need to measure. Once you have this, use this calculator to calculate the safe distance from the antenna. Please beware that the frequency and power level of the RF field, distance from the antenna to a person, and radiation pattern of the antenna are all factors that affect the RF exposure of people near an amateur station antenna as well as how much you are transmitting. Also keep in mind that while you yourself are limited to the controlled maximum compliance distance, you must ensure that any other people are as far as the uncontrolled maximum compliance distance away.