>
>> Hans said:
>>
>> >I do not know whats inside the filter but if you are lucky
>> >it is a ladder filter with no ferrite transformers that degrade
>> >the filters big signal performance.
>
>Peter replied:
>
>> I did a lot of work on IMD in crystal filters back in the mid 1970's. The
>> ferrite transformer business I found interesting, since I was never able
>> to find a filter where the ferrite transformer was the problem - and this
>> was working with a number of filter manufacturers. I read about it in Ham
>> Radio magazine, but that was all.
>
>It's amazing what a single incorrect article can start.
"incorrect article" = examines self-declared expert's decrees.
>
>Because of stuff in ham books, people think:
>
>1.) Folded unipoles improve antenna ground system system
>efficiency.
>
>2.) Ferrites cause noticeable signal distortion if used anywhere in
>the system
>
depends on Webers per cubic meter. If the output waveform is notably
distorted, you have core saturation.
>3.) Parasitics cause tube and bandswitch failures.
>
? see Figure 24 on my Web site. See Figure 17.
end
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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