>
>At 01:50 PM 1/21/2000 -0700, you wrote:
>>
>>>
>>>Rich insists,
>>>
>>>
>>> "For this application, Type 61 ferrite is rated by the manufacturer at
>>>10MHz max. Using type 61 (mu=c.125) material at 14MHz, sinewave
>>>distortion can easily be seen on an oscilloscope. Type 43 ferrite is
>>>rated at 50MHz."
>>>
>>>I know we've gone thru this before, but my Amidon catalog lists 61
>>>ferrite used in (low Q) BROAD BAND transmission line transformer service
>>>good to 200 mHz. A la, most every balun and un-un on the market.
>>>
>
>>Amidon is Not a manufacturer of ferrite material.
>>
>
>What a completely worthless reply to the original message. He didn't say
>that Amidon manufactures anything Rich, he quoted a spec from the Amidon
>catalog. The Amidon catalog quotes specs provided by Amidon's suppliers.
>Amidon is a distributor - everyone already knows that.
>
I have the ferrite manufacturer's catalog, Phil. It has some different
specifications than Amidon's catalog. . I confirmed that, at least in
this application, with Type-61 material, core saturation begins just
below14MHz. Why use a 10MHz rated material when 50MHz rated material is
available? // It is my opinion that a lot of ham testing of ferrites is
done at less than full suds. With QRPP, Type 61 material tested ok
here at 30MHz.
cheers, Phil.
- Rich..., 805.386.3734, www.vcnet.com/measures.
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