Message-ID: <000201c34648$df53b320$6c1686d4@captbrian>
From: "captbrian" <captbrian@ukonline.co.uk>
To: rsgb_lf_group@blacksheep.org
Date: Wed, 9 Jul 2003 19:15:26 +0100
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Subject: LF: Earth losses
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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 <Alan.Melia@btinternet.com>
To: rsgb_lf_group@blacksheep.org <rsgb_lf_group@blacksheep.org>
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
>alan.melia@btinternet.com
>
>----- Original Message -----
>From: "captbrian" <captbrian@ukonline.co.uk>
>To: <rsgb_lf_group@blacksheep.org>
>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
>
>
>
>