>Rich Said:
>
>You prefer to use a core that can saturate?.
>
>Fred Says:
>
>I don't have or ever will have a ferrite toroid core saturation problem
>because Amidon specifies the ones to use and also states what happens well
>before saturation can ever occur. You might like to get their more detailed
>publication that specifies and provides salient characteristics of their
>products.
I have saturated ferrite cores.
>The air core "ugly balun" is saturation proof.
>Mine is dated 1996 so there is probably a more current one
>available. They have no title to the book (8 x 11 size) so you have to ask
>for the detailed manual.
>
I have the book provided by the ferrite manufacturer.
>Rich says:
>
>This tuner was not intended for QRPP. Not saturating with large suds was
>an important issue for the balun.
>
>Fred Says:
>
>Understood. I am not referring to a QRPP area. I am only referring to the
>ferrite core issue.
>
power counts. SWR counts.
>Also, I mentioned the problem where an L-Matching network can not match all
>impedances . Nevertheless, a fairly wide load impedance range is covered by
>swapping input and output of the L-network --
good point. This is why I used a 2-position switch.
>but there are load impedances
>that can not be matched as I previously stated (included the fact that it
>takes eight L-network configurations to match all load impedances --
either the shunt C is across the input, or it is across the output. I
count 2.
> I have
>proved that to myself and Phillip Smith, like I said before, also has).
>But, like the old EF Johnson Matchbox which many are still using, an
>external shunt or series reactive component can easily be added to allow a
>conjugate impedance match.
>
If a conjugate match were provided, amplifier efficiency would be no more
than 50%.
>Rich says:
>
>A saturation-proof, low-cost, non-resonant, non-incendiary balun is a
>"poor solution" ?
>
>Fred says:
>
>Again, they are not balun ferrite cores as you describe. The correct
>choice of a ferrite balun toroid core, will prevent those problems
>concerning saturation from occurring.
>
>Rich says:
>
>I deliberately did not answer that question because I smelt red herring.
>
>Fred Says:
>
>I don't understand the "smelling of a red herring" statement? Am merely
>curious regarding what you use to measure the balun and toroid ferrite core
>characteristics?
I did not measure the ferrite core balun./see below.
>Also, how did you determine that the configuration you
>chose will match all load impedances?
>
>Have you experienced any ferrite core saturation problems and/or failures?
>
I experienced Feculent TVI at 555MHz.
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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