Radio Wave Power And How It Gets Reduced By Distance

Introduction

Some people are very concerned that radio wave power coming from radio transmitters’ antennas will harm people. In particular people are troubled by mobile phone masts causing long term health problems when they are near to their homes.

I just want to make it clear how much a transmitter’s power diminishes as it spreads out from a transmitter. I’m sure some feel it must follow a simple linear law such as:

  • double the distance and get half the power,
  • triple the distance and get a third of the power,
  • quadruple the distance and get a quarter of the power.

When in fact it follows an inverse square law which is nonlinear and gives this type of result:

  • double the distance and get a quarter of the power,
  • triple the distance and get a ninth of the power,
  • quadruple the distance and get a sixteenth of the power.

This means the power (and damaging energy) is much lower than might be expected at any particular distance. Even within a short distance the power can drop considerably.

Mains Extension Cable Safety Issues With UK 13 Amp Plug

Introduction

There are three Mains Extension Cable Safety issues covered in this post which are:

  • A UK 13 Amp Mains Extension Cable Safety Issue where socket can become dangerously exposed. I came across it by chance when I landed on the PlugSafe site. I’ve linked to their site in this post so you can see what they have to say about the subject. I’ve also produced my own pictures depicting the problem so you can see what I’m referring to. Full credit to PlugSafe for making us all aware.
  • A fire risk due to overheating of coiled up mains extension cables when used for heavy loads.
  • A risk of shock when using old 13A plugs which don’t have insulated pins for Live and Neutral connections.