Fri 21st Apr 2017, 07:42
I'm going to have a go with a random wire (31 feet). As I need a good ground, is it acceptable to use the bonded earth in the house - eg. the central heating pipework that is bonded to earth?
Fri 21st Apr 2017, 08:37
You can certainly try it although most CH uses plastic piping these days and you will be using the mains earth which will introduce some noise. A good earth is not an easy thing to achieve and you may have to lay ground radials just as you would for a vertical to get best results.
Fri 21st Apr 2017, 09:18
Fri 21st Apr 2017, 21:47
I had a random wire, around 14 metres in length, plugged directly into the back of my MFJ intellituner for some time without an earth and it worked okish.
I did eventually take an earth to a ground spike. However, before connecting, I checked the voltage between the spike and the house earth, which was around 5 volts, so I had no concerns over using it.
If your house is PME, which is very likely, there are potential hazards in using an external earth, especially if there is a local neutral fault. This is the reason I checked before connecting.
One of our club members is just under 50 volts on his, for which the local DNO said wasn't a concern.
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