[Amps] confused reading amidon ferrite specs?

[Dan Sawyer]

Should mix 67 support a 1.8 to 55 MHz 1200 watt transformer?

On this topic:
    1. What physical form should be used?
    2. What is a reasonable turns on the 50 Ohm side (to start design).

Dan

R at contesting.com;Measures wrote:

>On Mar 7, 2006, at 9:03 AM, Jim Brown wrote:
>
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>>On Tue, 7 Mar 2006 08:56:08 -0800, R at contesting.com;Measures wrote:
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>>>On an oscilloscope, using 100w of RF, I observed that mix #61 begins 
>>>to
>>>distort the waveform at c. 13MHz.  Those who don't desire to generate
>>>harmonics should probably follow the manufacturer's specs and not
>>>operate 61 above 10MHz.
>>>      
>>>
>>The distortion and losses will depend on many variables, including the
>>power level, the size of the core, and the number of turns.
>>    
>>
>
>Agreed.  Waveform distortion is the result of of a combination of too 
>many Webers and too much f.
>
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>>What were your
>>test conditions (core size, turns, etc.)?
>>    
>>
>
>I don't remember the details, Jim, however, as I recall it was a 2.4" 
>mix-61, mu=125,  core for a 450-ohm 8170 grid terminator R.  Whereas 
>everything looked wonderful on  the 'scope at 1W, at 100W, it did not.  
>After I read Permag Pacific's tech specs on mix-61, it was apparent 
>that the seller didn't.  As a result of seeing the harmonic distortion 
>above 13MHz with 100W, I switched to mix-67 (mu=40, rated by mfg at 
>80MHz max) and observed a clean sinewave at 29MHz.
>  
>
>>Jim Brown K9YC
>>
>>
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>>    
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>
>
>
>Rich Measures, 805.386.3734, AG6K, www.somis.org
>
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