[Elecraft] K3 related - non-linear audio transformer behavior

[Jack Smith]

Paul:

I've revised my non-linear transformer page in two respects:
1. Added the plot you requested. (Almost at the bottom of the page)
2. Added square wave ringing data for four transformers, although I am 
not at all convinced that square wave ringing is an appropriate figure 
of merit for a transformer used in a narrowly bandwidth limited 
communications receiver.

The page is:
http://www.cliftonlaboratories.com/non-linear_transformer_behavior.htm

Paul Christensen wrote:
> Jack:
>
> With regard to the plots under "Comparisons and Conclusions," and also 
> under "Frequency Response Compared,"  is it possible to change the 
> source Z from 600-ohms to 50-ohms and re-test?
>
> It would be an interesting exercise to see if THD (at ~ 1V RMS) and 
> the high-end frequency response of the Bourns transformer changes 
> significantly. Tnx!
>
> Paul, W9AC
>
> ----- Original Message ----- From: "Jack Smith" 
> <jack.smith at cliftonlaboratories.com>
> To: "'Elecraft'" <elecraft at mailman.qth.net>
> Sent: Saturday, September 20, 2008 8:02 AM
> Subject: [Elecraft] K3 related - non-linear audio transformer behavior
>
>
>> I've spent the last two weeks measuring and analyzing non-linear 
>> behavior of several audio transformers, focusing on the Tamura 
>> TTC-108 used as isolation transformers in the K3.
>>
>> My data and analysis is now available at 
>> http://www.cliftonlaboratories.com/non-linear_transformer_behavior.htm
>>
>>
>> Jack K8ZOA
>> www.cliftonlaboratories.com
>>
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>
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