>From Palomars website;
61 mix
u = 125
For RFI: 1-1000 MHz
For Coils: .2 to 10 MHz
For Xfmrs: .2 to 100 MHz
Is the only one that covers the full range from 160 to 6 meters or 2-30 MHz for
that matter. Amidon and Fair-Rite say the same thing in some of their
literature.
http://www.palomar-engineers.com/Ferrite_Cores/ferrite_cores.html
*********** REPLY SEPARATOR ***********
On 3/7/06 at 8:56 AM R; Measures wrote:
>On Mar 7, 2006, at 8:16 AM, Will Matney wrote:
>
>> Dan,
>>
>> For 2-30 MHz, the guy a Palomar Engineers said to use 61 in place of
>> 43.
>
>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.
>
>> 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
>>
>> *********** REPLY SEPARATOR ***********
>>
>> 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
>>> _______________________________________________
>>> Amps mailing list
>>> Amps@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>
>
>
>Rich Measures, 805.386.3734, AG6K, www.somis.org
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