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Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
As ... said you can think of any conventional TC as a magnifier because only the lower part of the secondary is actually magnetically coupled to the primary. The remaining part of the secondary is not coupled to the primary and this is the part that is free to resonate. The location on the secondary where this division takes place depends on the coupling coefficient k.
The magnifier arrangement simply physically seperates the two parts of the secondary coil: The section that takes part in transformer action via magnetic coupling with the primary, and the section that is free to take part in resonance with the topload capacitance.
Once the secondary is split into two discrete coils the geommetry and construction of each coil can then be optimised for its purpose. Coupling in the pri-sec transformer can be tightened to the maximum to get the best transformer action with less risk of flashover because the voltage at the top of the secondary is only moderately large. The wire thickness can be increased to minimise conduction losses here where RF current is high. The number of turns here is more important because it is turns-ratio that governs voltage gain in the transformer section.
Conversely, the free-standing resonantor section can use much thinner wire to achieve lots more inductance because it is resonant action that is important here and current decreases towards the top of the resonator. The resonator with toroid can also be located some distance from the pri and sec wiring, rsg, etc and base-fed from the pri-sec transformer via a transmission line. This greatly reduces the chances of the pri-sec, rsg or supply electronics getting hit by rogue discharges from the toroid.
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What is beneficial about Tesla magnifiers?
