Jim, I agree on your points.
What do you think about putting a capacitor in series with one of the
wires? That should create some interesting voltage patterns at the top
load, shouldn't it? Instead of a simple sine wave of voltage peak there
could be several simultaneous voltage peaks in steps. Also, the multiple
peaks can be static or time varying.
Certainly, the overall streamer length will suffer under most wave
patterns, but it could be possible to create more diverse streamer dynamic
and possibly even extend the streamer by almost double with just the right
frequency combination.
Installing a variable capacitor at the base of the coil on one of the legs
could add even more interesting effects. At the base of the coil it would
only be necessary to have a capacitor with high current rating. The
potential should be near zero in a tuned coil.
For that matter, wouldn't a carefully chosen capacitor placed at the ground
terminal of a single-wound secondary coil provide more reliable streamer
output?
Dave
On Thu, Mar 20, 2014 at 10:33 AM, Jim Lux <jimlux@xxxxxxxxxxxxx> wrote:
> On 3/20/14 7:36 AM, David Thomson wrote:
>
>> On Thu, Mar 20, 2014 at 7:22 AM, t-burns14 <t-burns14@xxxxxxxxxxx> wrote:
>>
>> Have any of you wound bifilar coils? What is the difference in
>>> performance?
>>>
>>>
>> Bifilar coils effectively increase the wire diameter by two. The
>> difference
>> is a higher current, lower potential output at the top load. The streamers
>> are brighter, thicker, and snappier.
>>
>> Now that I think about it, It also seems to add an extra dimension to the
>> resonance in the secondary. Instead of having a single conductor in
>> resonance, there are now two conductors in resonance.
>>
>> the conductors are very tightly coupled.. It's just like a coil wound
> with fatter wire or with Litz wire.
>
> Basically N/2 turns, same length.
>
> For long skinny coils, where the magnetic field coupling from one end of
> the coil to the other is lower, inductance is almost as much a function of
> length as number of turns.
>
> For a tight coil with all the turns in a small cross section (think
> transformer winding), the inductance is more like N^2, but for long coils,
> it's more like N...
>
>
> Check out the Wheeler equations and build a spreadsheet to experiment..
>
>
>
>
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