[Amps] New HF amplifier

[Jeff Blaine]

Larry,

This is true that toroids with partial windings used are fine - if the core 
power dissipation and local flux density limits don't exceed the capability 
of the core.

For a project here, I would be most interested to know if this can somehow 
be determined by observation alone?

Thanks

73/jeff/ac0c
www.ac0c.com


--------------------------------------------------
From: "Larry Benko" <xxw0qe at comcast.net>
Sent: Monday, August 02, 2010 12:05 PM
To: <amps at contesting.com>
Subject: Re: [Amps] New HF amplifier

> What are you using as the basis for this blanket comment?  There is
> absolutely nothing wrong with tapped toroids.  What causes problems is
> treating them as is usually done for air core coils which have the
> unused turns shorted out.  On a toroid you do NOT short out any turns if
> some of the turns are active.  Otherwise you get significant loss and
> heating in the toroid.
>
> Larry, W0QE
>
> Dennis OConnor wrote:
>> Tapped toroids show that the designer was too cheap to do the job 
>> right...
>>
>> Built cheap, for the cheap! Move along folks, nothing to see here... Move 
>> along...  Keep moving...
>>
>>
>> denny / k8do
>>
>>
>>
>>
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