Message-ID: <4C696537.6090107@o2.ie>
Date: Mon, 16 Aug 2010 17:20:07 +0100
From: Tony <ei8jk@o2.ie>
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Subject: Re: LF: Re: Earth electrode antenna tests
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  Hi Alan.

Last week I hooked up my sig genny to the loop and the maximum signal 
was at right angles to the wire, so I was expecting receive to be the same.
Seems not.

Tony, EI8JK


On 16/08/2010 16:51, Alan Melia wrote:
> 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.
>>
>
>
>