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LF: Earth losses

To: [email protected]
Subject: LF: Earth losses
From: "captbrian" <[email protected]>
Date: Wed, 9 Jul 2003 19:15:26 +0100
Reply-to: [email protected]
Sender: <[email protected]>
Thanks for all this ...

Three  more then I'm away to S.Wales for a few days 2m mobile only down the
M4

Is 24in wide 24 ft. long [inside the ridge of my roof } of aluminium foil
tacked to the rafters not better as a top capacity than 100ft of top-wire
down the garden ?. Either way I am stuck with 24' vertical  but my
top-loading coil and feed point and capacity can be inside the attic.

I thought that at LF,  losses through brickwork were so slight that it
wouldn't matter that the vertical was almost touching brickwork at endwall
of house ??. If it's temperamental rhododendrons tho' ????....

As a separate  matter does anyone know a site that gives figures for
attenuation of sigs from an attic antenna at various frequencies ?? HF/VHF

Bryan


-----Original Message-----
From: Alan Melia <[email protected]>
To: [email protected] <[email protected]>
Date: 09 July 2003 15:52
Subject: LF: Re: Re: re Earth losses


Hi Bryan re1) You will get this.....ask any patent seeker.
               2) it supplemented the mains earth and a couple of
spikes...NB connecting the mains earth made a lot of difference. However
Finbar has an underground armoured to a pole and transformer, and I guess
there is quite a good earth at the pole to protect the transformer. His
counterpoise had this effect as he already had about 1000pF or top-load
wire
out (5 wires) Hence my preference in 3 of topwires before counterpoise. I
also believe from the article that Peter quoted in the Handbook that there
is an advantage to earthing the remote end of the counterpoise if it is
under a top-wire. I have no independent tests to confirm that yet.
               3) difficult it probably depends on a lot of local factors,
but personally I would put two in the air. Top load can be fan or zig-zag,
and can be relatively light gauge wire as it carries less current, and not
really "radiating current" (that may be contentious)

               I hope that helps a bit.

Cheers de Alan G3NYK
[email protected]

----- Original Message -----
From: "captbrian" <[email protected]>
To: <[email protected]>
Sent: 09 July 2003 15:02
Subject: LF: Re: re Earth losses


1) every time I  have a good idea some other B(oy) thought of it first.

2)  Did Finbar's wire replace or supplement the real earth?

3) If you only had a given amount of wire for the horizontal , would you
put:

One in the sky and one underneath it near ground

OR

Two in the sky. and a ground rod.

Bryan






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