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From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <4C694CC6.3010609@o2.ie>
Date: Mon, 16 Aug 2010 16:51:27 +0100
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Subject: LF: Re: Earth electrode antenna tests
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Hi Tony, why do you think the directivity is wrong? It looks as though they
are operating like loops with the majority of the loop area in the ground.
This is a fairly common appreciation of ground "aerials" though Dave Gibson
doesnt seem to agree
 :-))

Alan
G3NYK

----- Original Message ----- 
From: "Tony" <ei8jk@o2.ie>
To: <rsgb_lf_group@blacksheep.org>
Sent: Monday, August 16, 2010 3:35 PM
Subject: LF: Earth electrode antenna tests


>   Yesterday I spent some time playing with different antennae.
> I started by laying out another wire 52m long orientated roughly
> north/south and then I shortened my original wire also to be 52m and
> this one is east/west, both terminated with an earth rod.
> Results were not as expected however as although the two earth electrode
> antennae show most definite directivity they were the wrong direction.
>
> I monitored BBC R. Bristol on 1548 KHz which is about 500 Km due east of
> me and on the inverted L (tuned VSWR 1.6:1) I could just detect a
> carrier heterodyne, on the N/S earth electrode antenna it was S1 but on
> the E/W earth electrode antenna it was S3.
> RNE5 on 531 KHz about 960 Km due south of me was S3 on the E/W and S8 on
> the N/S
>
> HGA22 (135 KHz) to my east was S4 on the E/W and S1 on N/S
>
> Readings were taken about 12:00 utc so most definitely ground wave.
>
> I was expecting the directivity to be broadside on the earth electrode
> antennae, but they seem to behave like a Beverage in that respect, but
> something that I think I will investigate further, maybe see if there is
> any difference if I terminate them with a resistor.
> I'm sure Mal is correct though that they would be useless to TX through
> but for RX they seem to have possibilities especially after dark as they
> are a lot quieter.
>
> All good fun.
> 73, Tony, EI8JK.
>