Message-ID: <4D72471D.30904@talktalk.net>
Date: Sat, 05 Mar 2011 14:22:21 +0000
From: "qrss@talktalk.net" <qrss@talktalk.net>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.2.15) Gecko/20110303 Thunderbird/3.1.9
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
References: <AANLkTimy87NkJ3VXf4qeQ3NMehA_6HzAe6mHBJ6M_Sts@mail.gmail.com>
In-Reply-To: <AANLkTimy87NkJ3VXf4qeQ3NMehA_6HzAe6mHBJ6M_Sts@mail.gmail.com>
Subject: Re: LF: Sub 9kHz antenna tests.
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


Hi Gary

I am testing a very similar loop to your 1.1m square, mine is 800mm sq. 
and uses Litz wire. Results at the same hight as my E-Probe are 
disappointing as yet.

I have no pre amp on it, and am wondering whether it would be 
advantageous as when tuned to 8.9kHz the noise level rises by 10dB. I 
suppose I shall end up building an amp to try but I would welcome any 
thoughts from the group.

73 Eddie G3ZJO

On 05/03/2011 12:35, Gary - G4WGT wrote:
> Hi All,
>
> Whilst monitoring 9090kHz & 8970kHz using SpecLab at 423uHz, I am 
> testing 3 different VLF Rx antenna types :-
>
> 1 - An 84mH shielded ferrite loopstick (10mm x 200mm), 1 metre above 
> ground
> 2 - A modified PA0RDT Mini-Whip, 8 metres above ground
> 3 - A 1.1 metre square loop with 46 turns of 1mm insulated wire, 1 
> metre above ground
>
> Both of the loops using M0BMU VLF pre-amp.
>
> I have had No. 1 connected since 2000utc last night until 1030utc this 
> morning, no signals detected on the SpecLab display. I have connected 
> No. 2 at 1030utc & notice a fall in noise level of about 10dB & a 
> greater visibility of the Alpha signals. Later today I will connect 
> the large loop & report my findings.
>
> 73,
>
> Gary - G4WGT - IO83qo.