[Lowfer] a thought on coils

Thu, 14 Feb 2002 19:47:13 -0800

Ed,

A good place to find out something about ferrite cores and such would be at
http://www.amidoncorp.com/f_mfg.htm. This will answer a lot of questions. In
a nut shell though, ferrite cores increase the inductance of a coil for a
given amount of turns. The greater the permeability, the more inductance per
turn. Ferrite is not generally used in LF antenna coils because it can
easily saturate and overheat which cause numerous problems, the worst case
being, your coil catches on fire or melts down. Not good. If your new to the
hobby I would stay away from ferrite and just wind a good air coil using the
ideas presented on the list or maybe one of the numerous web sites
specializing in LF . I see you already have a good address for Litz wire so
I won't bother with that. Somebody on the list might be willing to
share/sell some small quantity so you can experiment. My current coil uses
16 gauge stranded copper and it works fine. The Frequency of Walt's (WI)
beacon was 188.700 kHz. Hope this helps.

73
John/AB4MS/JDH

----- Original Message -----
From: Peter Barick <[email protected]>
To: <[email protected]>
Sent: Thursday, February 14, 2002 3:07 PM
Subject: RE: [Lowfer] a thought on coils

>
> >>> [email protected] 02/14/02 03:57PM >>>
> The questions I have are: 1) no knowledge of what ferrite; 2) where
> can
> I get some/a lot of, litz wire; and, finally: 3) what was the freq?
>
> 73  Ed Tanton  N4XY  <[email protected]>
> website:   http://www.n4xy.com
> --------------------------------------------
>
> Hi Ed,
>
> Litz wire is not inexpensive for the big sizes, but here is a "king
> size" supplier:
> http://www.wiretron.com/litz.html
>
> Then there's Nebraska Surplus that has small litz for cheep. You can do
> an easy search for them.
>
> A recent poster here offered litz. Maybe he's lurking.
>
> Peter
>
> _______________________________________________
> Lowfer mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/lowfer