20-03-2021, 04:31 PM
As has been said, Jeffrey has got it well summarised as regard EMC causing inconvenience to others. The other side to the matter of EMC is safety. Here we are talking of high power sources like transmitters.
There was a thread about this on the UKVRR board recently, mainly populated by RSGB members. The hazard from strong (non-ionising) RF fields is mainly internal heating of body tissues, with nerve stimulation also considered a factor below about 10 MHz.
The International Commission on Non-Ionising Radiation Protection (ICNIRP) have published https://www.icnirp.org/cms/upload/public...dl2020.pdf
As you might imagine, this has been a concern for those of us preparing to run the BHTG transmitter. As I understand it, the maximum permitted field intensity at our frequencies is 2 watts per square meter. Both Ofcom and the RSGB have helpfully provided 'safe' distance calculators, which allegedly take into account the vagaries of the near field, which at low VHF is noticeably affected by the wavelength as well as by the inverse square law.
There was a thread about this on the UKVRR board recently, mainly populated by RSGB members. The hazard from strong (non-ionising) RF fields is mainly internal heating of body tissues, with nerve stimulation also considered a factor below about 10 MHz.
The International Commission on Non-Ionising Radiation Protection (ICNIRP) have published https://www.icnirp.org/cms/upload/public...dl2020.pdf
As you might imagine, this has been a concern for those of us preparing to run the BHTG transmitter. As I understand it, the maximum permitted field intensity at our frequencies is 2 watts per square meter. Both Ofcom and the RSGB have helpfully provided 'safe' distance calculators, which allegedly take into account the vagaries of the near field, which at low VHF is noticeably affected by the wavelength as well as by the inverse square law.
