Envelope-to: dave@picks.force9.co.uk
Delivery-date: Wed, 25 Jan 2006 18:49:41 +0000
Message-ID: <000b01c621df$f54a2ae0$2101a8c0@pcroelof>
From: "Roelof Bakker" <roelof@ndb.demon.nl>
To: rsgb_lf_group@blacksheep.org
References: <NKEMLGOEKANPNJOBFBAFGEKDCJAA.g4wgt@tiscali.co.uk> <016101c61d02$12ceca40$2101a8c0@pcroelof> <002b01c61d54$c510aaa0$20347ad5@w4o8m9> <013401c621bd$c7f33c20$2101a8c0@pcroelof> <000001c621d9$6ee29240$67b0fea9@lark>
Date: Wed, 25 Jan 2006 19:48:40 +0100
MIME-Version: 1.0
Subject: LF: Re: Re: Re: Re: Mini Whip and local noise
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Hello Alan, LF group,

Thank you for your comments.
I am actually living in a house with brick walls and wooden floors.
One of the tests I did was on the second floor of a large concrete community 
building.

>> What is often not appeciated about voltage probe antennas is that the 
>> output
signal voltage is dependent upon the height above ground <<

I have performed some height test as well and found the following figures:

height               rel. dB
=================
1.2 m / 4 ft            0 dB
2.4 m / 8 ft         + 4 dB
3.6 m / 12 ft       + 6 dB
4.8 m / 16 ft       + 8 dB

Shielding by bushes in my garden has also been noted. I had to raise it 
above these to restore a good s/n ratio. On the other hand, at an open field 
near a lake it worked first class 2 metre high and raising it improved 
signal strength but not the signal to noise ratio.

I have a 0.7 metre tunable loop hanging on the wall. One of these days I 
will try it on 137 kHz indoor.

Best regards,

Roelof Bakker, pa0rdt