[Amps] confused reading amidon ferrite specs?

[Will Matney]

Dan,

For 2-30 MHz, the guy a Palomar Engineers said to use 61 in place of 43. Their literature says to look at the frequency spec of each transformer (which is for narrow band types), and for broadband types, the upper frequency can be multiplied by X10 if I recall. The lower frequency though needs to be kept was the way I read it. Palomar buys direct from Amidon also. In designing the transformers, an inductive reactance of at least 200 ohms should be met, and make sure the flux density is below the knee on it's BH curve which is the linear region. Maximum Permeability is reached just above the start of the knee on the curve from the bottom.

Best,

Will

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On 3/7/06 at 7:24 AM Dan Sawyer wrote:

>I have to say I am very confused reading Amidon ferrite core specs.
>
>http://www.amidoncorp.com/aai_ferritecores.htm
>
>As an example in the paragraph description material 61 and 67 cores are 
>good for transformers up to 200 MHz while in the spec sheet the 
>transformer claim is 500 MHz and 1000 MHz respectively.
>
>I am interested in building a solid state 1200 watt power amp for 160 
>through 6 meters. What are the materials suitable for the input and 
>output transformers in that range?
>
>Thanks - Dan - kb0qil
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