Hi:
The material permeability gets reduced to effective permeability depending on the rod length / diameter radio (you would
like it to be >= 100) to realize the material permeability).
For example: http://www.magneticsgroup.com/pdf/erods.pdf
More on ferrite loop sticks at:
http://www.prc68.com/I/Loop.shtml
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/Brooke4Congress.html
li...@lazygranch.com wrote:
Wouldn't the difference be directly proportional to the relative permeability?
If so, the difference would be more like 125, not 10, depending on core
material.
-----Original Message-----
From: ehydra<ehy...@arcor.de>
Sender: time-nuts-boun...@febo.com
Date: Sat, 17 Mar 2012 21:22:17
To: Marek Peca<ma...@duch.cz>; Discussion of precise time and frequency
measurement<time-nuts@febo.com>
Reply-To: ehy...@arcor.de, Discussion of precise time and frequency measurement
<time-nuts@febo.com>
Subject: Re: [time-nuts] WWVB BPSK Receiver Project? (fwd)
Marek Peca schrieb:
This was almost the only reason for ferrite rod -- simplicity and
attenuation of TVs, some LCDs, 50Hz etc.
If you make the antenna about 10x bigger you can omit the whole ferrite.
The only benefit of a ferrite loaded coil is the size of it!
In ancient time radios had flat air coils like spider webs. In fact they
are named after spiders in german.
This air coil can be resonated too!
I can imagine a resonated vertical antenna. Never seen that but all it
requires is a low impedance pre-amp stage and a loading coil of very high Q.
- Henry
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