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Re: [TCML] first coil
Hi Douglas,
The primary may need some more thought. I have no problem with the
angle, but the secondary position is important. "IF" the bottom
secondary was even with the bottom inside primary turn, then coupling
would be 0.192 which is too high. This will cause damaging racing sparks
along the secondary form (inside and outside). Javatc recommends 0.13
coupling for this particular coil. So, I set the auto-coupling adjust to
0.13 and ran the program. The program then adjusts the primary height
until 0.13 is achieved. The secondary bottom turn ended up at 1.93
inches above the primary inside turn. So round that to 2 inches.
For the 12/30 NST, the desired value for a static gap is 0.01uF. With
your primary, this is 12.75 turns. This will end up at 42 feet of
primary conductor. You could use 1/4" spacing and get down to about 37
feet of conductor which would then need 13 turns. However, it's wise to
add a couple more turns than needed, so figure on a 15 turn primary for
a .01uF cap.
Here's how the coil looks after the coupling was adjusted to 0.13:
http://www.classictesla.com/temp/ds01.gif
All in all, not a bad coil. Spark lengths could be 28" if your NST was
full of piss and vinegar, but likely 20" to 25" will be realized if the
gap is well built.
Take care,
Bart
PS. Copy of my numbers follow:
---------------------------------------------------
J A V A T C version 11.7 - CONSOLIDATED OUTPUT
Monday, April 28, 2008 6:24:51 PM
Units = Inches
Ambient Temp = 68°F
----------------------------------------------------
Surrounding Inputs:
----------------------------------------------------
100 = Ground Plane Radius
100 = Wall Radius
150 = Ceiling Height
----------------------------------------------------
Secondary Coil Inputs:
----------------------------------------------------
Current Profile = G.PROFILE_LOADED
2.2 = Radius 1
2.2 = Radius 2
20 = Height 1
36 = Height 2
940 = Turns
26 = Wire Awg
----------------------------------------------------
Primary Coil Inputs:
----------------------------------------------------
2.5 = Radius 1
6.71 = Radius 2
17.877 = Height 1
20.189 = Height 2
13.5172 = Turns
0.25 = Wire Diameter
0.01 = Primary Cap (uF)
30 = Total Lead Length
0.2 = Lead Diameter
----------------------------------------------------
Top Load Inputs:
----------------------------------------------------
Toroid #1: minor=4, major=14, height=39, topload
Disc #1: inside=0, outside=6, height=39, topload
----------------------------------------------------
Secondary Outputs:
----------------------------------------------------
240.97 kHz = Secondary Resonant Frequency
90 deg° = Angle of Secondary
16 inch = Length of Winding
58.8 inch = Turns Per Unit
0.00108 inch = Space Between Turns (edge to edge)
1082.8 ft = Length of Wire
3.64:1 = H/D Aspect Ratio
43.8334 Ohms = DC Resistance
35886 Ohms = Reactance at Resonance
0.83 lbs = Weight of Wire
23.702 mH = Les-Effective Series Inductance
1443.959 mH = Lee-Equivalent Energy Inductance <-- ignore this
number. I see a problem I need to fix.
23.987 mH = Ldc-Low Frequency Inductance
18.405 pF = Ces-Effective Shunt Capacitance
17.687 pF = Cee-Equivalent Energy Capacitance
27.871 pF = Cdc-Low Frequency Capacitance
5.82 mils = Skin Depth
14.361 pF = Topload Effective Capacitance
132.0624 Ohms = Effective AC Resistance
272 = Q
----------------------------------------------------
Primary Outputs:
----------------------------------------------------
240.97 kHz = Primary Resonant Frequency
0 % = Percent Detuned
29 deg° = Angle of Primary
32.59 ft = Length of Wire
5.41 mOhms = DC Resistance
0.105 inch = Average spacing between turns (edge to edge)
1.872 inch = Proximity between coils
1.21 inch = Recommended minimum proximity between coils
42.762 µH = Ldc-Low Frequency Inductance
0.01 µF = Cap size needed with Primary L (reference)
0.861 µH = Lead Length Inductance
131.767 µH = Lm-Mutual Inductance
0.13 k = Coupling Coefficient
0.13 k = Recommended Coupling Coefficient
7.69 = Number of half cycles for energy transfer at K
15.79 µs = Time for total energy transfer (ideal quench time)
----------------------------------------------------
Transformer Inputs:
----------------------------------------------------
120 [volts] = Transformer Rated Input Voltage
12000 [volts] = Transformer Rated Output Voltage
30 [mA] = Transformer Rated Output Current
60 [Hz] = Mains Frequency
120 [volts] = Transformer Applied Voltage
0 [amps] = Transformer Ballast Current
0 [ohms] = Measured Primary Resistance
0 [ohms] = Measured Secondary Resistance
----------------------------------------------------
Transformer Outputs:
----------------------------------------------------
360 [volt*amps] = Rated Transformer VA
400000 [ohms] = Transformer Impedence
12000 [rms volts] = Effective Output Voltage
3 [rms amps] = Effective Transformer Primary Current
0.03 [rms amps] = Effective Transformer Secondary Current
360 [volt*amps] = Effective Input VA
0.0066 [uF] = Resonant Cap Size
0.0099 [uF] = Static gap LTR Cap Size
0.0173 [uF] = SRSG LTR Cap Size
66 [uF] = Power Factor Cap Size
16971 [peak volts] = Voltage Across Cap
42426 [peak volts] = Recommended Cap Voltage Rating
1.44 [joules] = Primary Cap Energy
259.5 [peak amps] = Primary Instantaneous Current
27.4 [inch] = Spark Length (JF equation using Resonance Research Corp.
factors)
7.9 [amps] = Sec Base Current
----------------------------------------------------
Static Spark Gap Inputs:
----------------------------------------------------
5 = Number of Electrodes
1 [inch] = Electrode Diameter
0.21 [inch] = Total Gap Spacing
----------------------------------------------------
Static Spark Gap Outputs:
----------------------------------------------------
0.053 [inch] = Gap Spacing Between Each Electrode
16971 [peak volts] = Charging Voltage
16567 [peak volts] = Arc Voltage
35601 [volts] = Voltage Gradient at Electrode
78891 [volts/inch] = Arc Voltage per unit
97.6 [%] = Percent Cp Charged When Gap Fires
10.473 [ms] = Time To Arc Voltage
95 [BPS] = Breaks Per Second
1.37 [joules] = Effective Cap Energy
393930 [rms volts] = Terminal Voltage
131 [power] = Energy Across Gap
28.6 [inch] = Static Gap Spark Length (using energy equation)
douglas smith wrote:
hi i have some specs to show you could you give me an idea how it looks
12kv 30ma nst ,primary dia .25, spacing .38, hole dia 5", angle30 deg,20' of coil. secondary, 26awg, 940 turns, s/h 16", s/d 4.4. top load r/d 4", overall dia14"
will use static spark gap w/fan ,not sure on caps yet
thanks
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