Electromagnetic Fields
1G1 Recall the
Note:
Recall the purpose of basic EMF restriction.
"What is EMF", it is Electromagnetic Force. So where does this come from. All radio transmitters creates EMF when ever it generates a Radio Signal and this is propagated away from the antenna as a field of radiation.
The purpose of an EMF restriction is to prevent levels of EMF which could adversely affect the general public being exposed to hight radio frequency fields than is considered safe.
Equipment to which the EMF restrictions apply
The rules apply to any radio transmitting equipment radiating more than 10 watts EIRP but this does not apply to hand held transceivers which are transmitting much lower power levels.
Transmit power level at which the EMF restrictions apply
From the previous section it was explained that the power level where the restrictions apply is 10 watts EIRP, which is simply put ERP Effective rediated Power but using the isotropic reference. So what is isotropic reference well is relates to an isotropic antenna which is defined as a hypothetical antenna having the same radiation in all directions (i.e., uniform radiation). It is assumed that the power gain of an isotropic antenna is 1.0. However at Foundation Level it is considered sufficient to recall that 10 watt EIRP is the same as 6.1 watt ERP. persons to which the EMF restrictions apply
The restrictions apply to all radio amateurs
Need to keep a record of assessments carried out
Because the restrictions apply to you, then you must carry out an assessment and keep a record of the results to determine the "Compliance Distance" which is the closest point a person may be to an antenna and be below the limit of the EMF restriction.
The origin of some of the text on this page is from the RSGB with additions by the web master