Re: ferrite mini coil

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <PeterCGMN-at-aol-dot-com>


In a message dated 1/20/02 1:27:24 PM, tesla-at-pupman-dot-com writes:

>Before contemplating any use of a ferrite rod I recommend a
>flux-density calculation for the expected operating voltage and
>frequency.  I'd be very much worried about saturation losses and total
>failure.  About 20 years ago I tried using a ferrite slug to tune the
>loading coil for a VLF band transmitter, and had serious problems with
>saturation at 181 kHz with a voltage of only 1000 across the coil, which
>had about 3 mH inductance. This coil had a cylindrical core about 5/8"
>diameter.  I suspect that with your transistor radio antenna rod the
>diameter and area are much smaller, again leading to problems.
>
>Ed

Okay, once again pardon my stupidity, but what do you mean by the term 
"saturation"

73, Kc0Ion, "Ion-Boy"