All of that heat is produced by RF heating the core instead of being
radiated. It's all a matter of what you want to do with your RF :-)
One concern is the curie temperature - that temperature where the properties
of the core change dramatically. In an antenna matching network (a.k.a.
tuner) the
Ken,
When you do the research and math, worth bearing in mind that powdered iron
(and ferrite) cores can generate intermodulation products. Usually this
problem will affect the receive performance of an antenna matching
network, or a receiver's front end filters, if exposed to strong signals
From: Ken Alexander k.alexan...@rogers.com
To: Elecraft elecraft@mailman.qth.net
Sent: Monday, April 30, 2012 11:14:33 AM
Subject: [Elecraft] Loading inductor Question
Folks,
Given that inductors on toroid cores are used extensively in autotuners, is
there any reason (assuming I choose
MFJ-902 tuner uses a single toroid with taps. The toroid becomes hot on some
frequencies with 100W but survives. I guess losses are small compared to
convenience of a very small unit.
From what I understand, the iron cores can have Q in excess of 300 if they
are below saturation. How much will
Folks,
Given that inductors on toroid cores are used extensively in autotuners, is
there any reason (assuming I choose the right size core, made of the correct
material for the application and winding it with the right size wire) for not
using one as a base loading inductor on a vertical
-boun...@mailman.qth.net] On Behalf Of Ken Alexander
Sent: Monday, April 30, 2012 8:15 AM
To: Elecraft
Subject: [Elecraft] Loading inductor Question
Folks,
Given that inductors on toroid cores are used extensively in autotuners, is
there any reason (assuming I choose the right size core, made
Ken -
A toroidal inductor should work fine, it is understood that the core
must be of the proper material and size to handle the expected power and
frequency range. Keep in mind that many of the automatic tuners use
toroidal inductors in their design. There is some advantage to
Here's a program that will let you compare toroid vs air core losses:
http://www.dl5swb.de/html/mini_ring_core_calculator.htm
Phil - AD5X
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Help:
On 4/30/2012 8:14 AM, Ken Alexander wrote:
Any down side to doing this?
Suitable core material is crucial here. The core materials used for RFI
suppression (including those used for common mode transmitting chokes)
work by adding lots of loss into the common mode circuit because they
are
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