Re: LF: Ferrite rods

[Roger Lapthorn <rogerlapthorn@gmail.com>]

Thanks Steve and John for information.

Mal - thanks for your always helpful comments. We love them.

73s
Roger G3XBM

On 15 August 2011 18:45, Steve, g4vbd <steve.g4vbd@sky.com> wrote:

Guys

Its £49.00 from this web site

 

http://www.lulu.com/product/paperback/channel-characterisation-and-system-design-for-sub-surface-communications/11253100

 

too expensive for me - but if you find a pdf then I'd be interested as well

Found this though

Electrode Contact Impedance Measurement in Through-The-Earth Communications

 

http://dcis2009.unizar.es/FILES/CR2/p30.pdf

 

regards

Steve, g4vbd

 

On Mon, Aug 15, 2011 at 12:02 PM, Roger Lapthorn <rogerlapthorn@gmail.com> wrote:

Is this PhD document publically available as a PDF John?

73s
Roger G3XBM

On 15 August 2011 11:26, John Rabson <john.rabson@numeo.fr> wrote:

There is an extensive discussion of ferrite rod antennas in Chapter 4 of:

       Gibson, David (2004) Channel Characterisation and System Design for Sub-Surface Communications PhD thesis, Leeds University 2004.

John
F5VLF

On 15 Aug 2011, at 09:46CEST, Roger Lapthorn wrote:

> Although I've little experience of ferrite rods on LF receive I did wind my 600uH 500kHz ATU loading coil for my 5w transverter on one.  With just a 5m top loaded vertical it worked well without saturation problems when  sitting on the bedroom table. At QRP it is less lossy as less wire is needed.
>
> People have successfully engineered (single turn I think) ferrite rods as TX antennas for 10MHz QRPp WSPR. Somewhere I have some information on this. As long as saturation is avoided there is some mileage for HF TX applications in very compact QRP stations.
>
> Worth some experiments on LF receive Stefan.
>
> 73s
> Roger G3XBM
>
> Via my iPod Touch 4g 2.4GHz handheld.
>

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