Re: [TCML] Stranded/silver plated wire (was Scientific Method)

[Drake Schutt <drake89@xxxxxxxxx>]

In response to both Herr Zapp and John Kirby-

Yes, DC's short posts do often leave more information to be desired.
However he is a frequent poster and often answers novice's questions that
others might respond with "check the archives".  That being said, he is the
only person (that i know of) on this list that actually makes a living of
our collective hobby.  A lot of business people that I know are often
pressed for time which would explain some of DC's short posts.

Drake Schutt

PS- I for one am jealous of DC and other's- imagine being able to build
Tesla Coils for a living!  Although I'm sure it's not all peaches and cream.


On Wed, Jul 29, 2009 at 7:05 PM, jc <johncatherine@xxxxxxxxxxxxx> wrote:

> DC
>
> Other members do not speak for me.  Far from being frustrated by your
> posts, on the contrary I am happy to learn what you have to share.
>
> Regards,
> John Kirby
>
>
> Quarkster wrote:
>
>> DC -
>>  Please explain what "not adequate" means, regarding 7 strand vs 19 strand
>> wire of the same gage.
>>  Why would the number of strands in a given size wire have any affect or
>> influence on winding the secondary coil, the performance of the completed
>> coil, cost, appearance, etc, etc.??
>>  (It's these incomplete statements with no supporting information that are
>> so frustrating to TCML readers!!)
>>  Knowing that the immediate response of EVERY reader of your post will be
>> "what possible difference can the number of strands make??", why not provide
>> the missing information in your original post?  Something like this would be
>> far, far more useful:
>>  "I use the 19 strand silver tinned type wire usually in 14 to 18 AWG on
>> many
>> of my high power coils.  The 7 strand is not adequate because:
>> (for example)
>>  "It is far stiffer than the 19 strand wire and does not conform closely
>> to the the secondary coilform."
>>  or  "The 19 strand wire has 12% lower AC resistance than the 7 strand
>> wire at the 125KHz resonant frequency of this particular 6" diameter X 32"
>> long secondary."
>>  Or whatever, just be specific! This is a technology forum, not a
>> gardening forum where "Plant the seeds sometime in August, and water
>> occassionally" is specific enough to get the desired results.
>>  Regards,
>> Herr Zapp
>>
>>
>>
>> --- On Wed, 7/29/09, DC Cox <resonance@xxxxxxxxxxxx> wrote:
>>
>>
>> From: DC Cox <resonance@xxxxxxxxxxxx>
>> Subject: Re: [TCML] Stranded/silver plated wire (was Scientific Method)
>> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
>> Date: Wednesday, July 29, 2009, 6:34 AM
>>
>>
>> I use the 19 strand silver tinned type wire usually in 14 to 18 AWG on
>> many
>> of my high power coils.  The 7 strand is not adequate.
>>
>> Dr. Resonance
>>
>>
>>
>>
>> On Tue, Jul 28, 2009 at 8:44 PM, jimlux <jimlux@xxxxxxxxxxxxx> wrote:
>>
>>
>>
>>> Lau, Gary wrote:
>>>
>>>
>>>
>>>> Are you saying that you use silver-plated STRANDED wire for
>>>> secondaries?  Granted, AC resistance and Q are far less important on
>>>> the secondary side, but the notion of this wire being superior to
>>>> common magnet wire is incorrect.  Stranded wire is inherently more
>>>> lossy at RF frequencies.  This is because the skin effect causes
>>>> current to travel on the outer surface of the bundle.  If a strand on
>>>> the outside of the bundle weaves to the interior of the bundle, the
>>>> current in that strand will try to find its way back to the surface,
>>>> and this means traveling to adjacent conductors, through any
>>>> resistive oxide layers between them.  This strand-hopping results in
>>>> a much higher AC resistance than if a single conductor were used.
>>>> This is the reason that Litz wire insulates the strands from one
>>>> another.
>>>>
>>>>
>>>>
>>> Most stranded wire is NOT braided. It's something like 7 strands, so the
>>>  outside strands stay outside. THe other thing is that 100kHz-ish
>>> frequencies have a fairly thick skin depth (0.2 mm in copper). It's not
>>> like
>>> at 15 MHz where skin depth is a few tens of microns.
>>>
>>>
>>>
>>>
>>>
>>>
>>>
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>>>>
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>>>
>>>
>>>
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>
>
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