[TowerTalk] W2AU Baluns??

[Wes Stewart]

I stand corrected re: W2AU v W2DU.

Nevertheless, Walt's comments did apply to some manufactured products.

On 3/15/2017 8:04 PM, Jim Brown wrote:
> Wes,
>
> I think you may be confusing W2AU-branded parts with W2DU's. Walt's original 
> common mode choke design paper was excellent -- as I'm sure you know, he built 
> and tested units with 50, 100, and 200 #73 Fair-Rite beads. The 200 bead 
> design was the best, but the commercial products I know of use only 50 beads. 
> This makes them far less effective and also greatly reduces their power 
> handling. Walt's choice of #73 was excellent -- it causes the choke to have a 
> predominantly resistive impedance from 80 - 15M. That cheapie trick of the mfr 
> is what makes them a fuse -- the greater the resistive impedance, the more 
> power than can handle.
>
> And, of course, some folks who failed to understand the need for resistive 
> impedance, not reactance, started telling people to use #43 cores. And after I 
> showed the virtue of the new (around 2003) #31 material, those who didn't 
> bother to read my tutorial showing how chokes work decided that a string of 
> #31 cores was even better. Which it is NOT, except on 2M. :)
>
> 73, Jim K9YC
>
> On Wed,3/15/2017 7:40 PM, Wes Stewart wrote:
>> It's disturbing to me to see my late friend Walt Maxwell, W2DU, disparaged 
>> this way.
>>
>> Walt addressed this issue before his passing here: 
>> http://www.eham.net/reviews/detail/2300
>
>
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