Home » Events » REHIS Northern Centre Amplitude Modulation Workshop REHIS Northern Centre Amplitude Modulation Workshop REHIS Northern Centre Amplitude Modulation Workshop. The workshop is open to REHIS members of both the Northern and Southern Centres. See the attached document for further details. Additional Files Event Location Aberdeen Event Date 28/03/2017 9:00 am Event End Date 28/03/2017 3:00 pm