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@contesting.com;Measures wrote:
>On Mar 7, 2006, at 9:03 AM, Jim Brown wrote:
>
>
>
>>On Tue, 7 Mar 2006 08:56:08 -0800, R@contesting.com;Measures wrote:
>>
>>
>>
>>>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.
>
>
>
>>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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>
>
>
>Rich Measures, 805.386.3734, AG6K, www.somis.org
>
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