Gentlemen, gentlemen, with all your horror stories you will frighten Martin
in to giving up amateur radio.
We need to answer his questions, and to do that we need to define the
problems, as I see it they are
1 Is his supply PME, and if so what is to be done about it, and what is to
be done to separate the RF noise from the mains, and the mains earth.
2 The RF earth lead could be a resonant length on some bands giving high or
low impedances and voltages, what can be done about it, or even does he need
an RF earth connection at all. What can he do to ensure that no high voltage
RF conductors can come into contact with anyone.
3 What can he do about lightening protection.
4 What can he do to ensure he does not create TVI or BCI to his neighbours.
All of the forgoing questions can be answered, but Martin deeds to supply a
few more details about
his home and surroundings.
some of the questions are as follows:
Is he in the UK if not where is he.
What kind of electricity supply does he have, overhead or underground
feeder, is it PME,
Is his building a high rise block, if not what type/height is it.
Where are the antenna's going to be mounted, on his building or on separate
self supporting structures or other buildings.
Are the antenna's and feeders going to be coax, balanced, or end, fed. Are
they resonant, broadband, or tunable.
Can he use an RF earth or counterpoise.
Martin wants the safest, cost affective solutions for his installation. All
of the problems and hazards are curable with a little care, and he will
still have a suitable and sensitive installation.
I recommend he obtains a copy of the RSGB book "HF antenna collection" which
has the Peter Chadwick article "the Killing ground" reproduced in it.
Another version is in the RSGB Book "The radio amateur guide to EMC.
This reply is already too long so I will put more answers regarding ELCB's
and RCCD's and PME in another email.
> Hi, and thank you for reading this.
> I am in stalling my radio station in to the small "box room" on the 2nd
> of the building and I have in the past not worried about a separate earth
> the station. But as this station is going to be a more permanent
> than my other previous locations I want to make sure that :-
> 1) the station is safe electrically. (of course the supply earth will be
> 2) protected form static (lightening etc).
> 3) has a good RF performance. (this means low resistance earth connection)
> 4) is as clear of EMC problems as possible.
> So any one got some pointers or helpful hints on installing a separate
> earth. The ground connection is easy 3 to 6 off 6' long 1" dia copper
> driven all the way in to the soil (I know it is a big is job but not
> The bit I am puzzling over is do I use a heavy copper strap as used on
> lightening conductors to provide a common earth for every thing or just
> static protection and then a separate heavy conductor to provide the shack
> equipment earth.
> In either case how can I ensure that the earthing does not radiate RF (I
> that making sure the aerials are correctly balanced with suitable baluns
> fitted is
> the answer here.)
> I did here about using RG8 type coax and connecting both inner and screen
> to the hardware in the ground but only connecting the shack earth buss to
> inner - any thoughts on this.
> Cheers Martin