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Re: LF: Ferrite rods

To: [email protected]
Subject: Re: LF: Ferrite rods
From: John Rabson <[email protected]>
Date: Mon, 15 Aug 2011 21:19:46 +0200
In-reply-to: <002e01cc5b74$8fe894a0$0401a8c0@xphd97xgq27nyf>
References: <[email protected]><[email protected]><CAHAQVWPwiuzbcH15q1hEjg1g+a0+NywcK967gn4U_g5=G6tCcA@mail.gmail.com> <CADoP_A+oet8E6V9JJqcjjw54NKkgV=5soWUPr5wW39ZXtXUA=w@mail.gmail.com> <002e01cc5b74$8fe894a0$0401a8c0@xphd97xgq27nyf>
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CREGies do!
John F5VLF

On 15 Aug 2011, at 19:55CEST, mal hamilton wrote:

Who wants sub surface !!!!!!!!!! Stay above ground as long as possible!!
G3KEV
 
----- Original Message -----
Sent: Monday, August 15, 2011 6:45 PM
Subject: Re: LF: Ferrite rods

Guys
Its £49.00 from this web site
 
 
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

 
 
regards
Steve, g4vbd


 
On Mon, Aug 15, 2011 at 12:02 PM, Roger Lapthorn <[email protected]> wrote:
Is this PhD document publically available as a PDF John?

73s
Roger G3XBM


On 15 August 2011 11:26, John Rabson <[email protected]> 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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