Section 6
Electromagnetic Compatibility

Routes of entry

6C1 Recall that interference occurs through local radio transmissions being conveyed to the affected equipment through pick up in house wiring, TV antenna down-leads, telephone wiring etc and particularly at VHF/UHF by direct pick-up in the internal circuits of the affected equipment

There are many ways that neighbour's house might pick up amateur transmissions and the following are examples telephone wiring, mains wiring, hifi loudspeaker wiring and of course a TV antenna.

The following explains more.

The interference can transfer from one piece of equipment to another in various ways:-

1. Be radiated from that antenna


2. Be induced between wires that are running in close proximity to each other


3. by conduction along a cable which is linked to both the sending and receiving equipment

The interference can be picked up by ALL of the following :-

1. the television aerial and downlead / feeders and aerial and downleads / feeders Radios and video recorders


2. telephone wiring both directly from the radiate signal and induced between several wires running close together


3. the mains wiring in the home


4. Hi-Fi loudspeaker wiring and at VHF/UHF by direct pickup by the internal circuits of the affected equipment itself.

The origin of some of the text on this page is from the RSGB with additions by the web master