Message-ID: <4C6965C5.6030805@o2.ie>
Date: Mon, 16 Aug 2010 17:22:29 +0100
From: Tony <ei8jk@o2.ie>
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Subject: Re: LF: Re: Earth electrode antenna tests
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  I will try that tomorrow Mal, but I'm almost sure it's bi-directional 
anyway.
The Spanish station to my south would have been endfire and Bristol to 
my east would have been backfire.

Tony, EI8JK

On 16/08/2010 16:59, mal hamilton wrote:
> Tony
> Unterminate(remove) the earth rods from the wires and see if  you get
> bi-directional properties, if so it would indicate a Beverage configured
> system.
> Some Earth type antennas described on here by some are only bodged
> Beverages. The only time to Earth an antenna wire is to avoid a lightening
> strike!!
>
> de mal/g3kev
>
> ----- 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.
>>
>
>
>