Re: Streamer Loading

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>

Hi all,
        I am more inclined than ever to think that this tuning to
match spark capacitance is not what's really going on. The results of
adjusting the coupling on Steve Ward's system that he posted last
week appear to me to support the view that the tuning is really a
sideband-enhancement thing. I think an experiment could be designed
to test where the truth lies. I hope to do some coiling in the not-
too-distant future to try and find out.

Malcolm

On 1 May 2005, at 10:42, Tesla list wrote:

> Original poster: "S&JY" <youngsters@xxxxxxxxxxxxxxx>
>
> Here's a way to quite accurately tune your primary to your secondary,
> taking into account the extra capacitance from streamer loading.  From
> your toroid, horizontally suspend a wire starting at the toroid, with
> the other end attached to some string to hold it horzontally.  The
> length of the wire should be the same as your typical streamer length.
>  Now measure the secondary frequency.  Then disconnect the toroid from
> the secondary, and tune the primary to the secondary frequency.  Your
> tuning should be very close to optimum - within a couple tenths of a
> primary turn.  (Remember to reconnect the toroid).
>
> Here is an example of the effect of a "wire streamer" on Fsec for a 7"
> diameter by 27 inch center to center toroid:
>
> Fsec (KHz)    Wire streamer length (ft)
> 143.3                0 (bare toroid)
> 139.8                2
> 138.4                2.5
> 137.3                3
> 136                    3.5
> 134.7                4
>
> For the 4 ft case, the primary is tuned about 6.4% lower for my coil.
>
> I used a home-built dip-meter with six foot leads to the sensor coil
> so I could be away from the coil and not significantly influence it's
> resonant frequency.  I measured the dip-meter frequency with a digital
> counter.  But using a Terry Tuner would work as well - just keep
> yourself as far away from the secondary as you can.
>
> Happy tuning,
> --Steve Y.
>
>
>