|
KEEP LEFT !!
----- Original Message -----
Sent: Monday, August 15, 2011 8:13
PM
Subject: Re: LF: Ferrite rods
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 <[email protected]>
wrote:
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.
>
--
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
https://sites.google.com/site/sub9khz/
--
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
https://sites.google.com/site/sub9khz/
|
|
