Tube Power Supply – Heater, Grid & Screen

In research using Tesla coils it is inevitable that sooner or later a vacuum tube power supply will become a necessary and invaluable addition to the laboratory equipment. Vacuum tubes when correctly setup and operated are a robust and high power solution to driving Tesla coils from very low frequencies, and to well into the HF frequency band. Most of my experiments are conducted in the 160m amateur band with a centre frequency around 2Mc, and with tuning that can go down as low as 500kc, and up to almost 4Mc. A vacuum tube generator that can be flexibly configured to drive different configurations and types of tubes to power levels over 1kW, and even up to as high as 5kW, opens the door to many fascinating and unusual electrical phenomena, that can be observed and measured using Tesla coils driven at higher powers and higher frequencies. This post is the first in a sequence to look at my own tube power supply, designed specifically with rapid prototyping and Tesla coil research in mind, and is the product of using vacuum tubes of various different types and configurations in my research over the years ... Read post

Cylindrical Coil Transmission Gain – TC S21

In this post the cylindrical coil transmission gain S21 is explored using the DG8SAQ vector network analyser. The small signal ac input impedance Z11 has been explored and presented extensively for both flat and cylindrical Tesla coils, and the transmission gain study in this experimental post continues the small signal analysis of this type of Tesla coil. The S21 characteristics show that the Tesla coil has its lowest insertion loss at the fundamental series resonant frequency, and its highest loss at a parallel mode. The series resonant mode remains relatively stable with changing primary tuning characteristics such as number of turns, and variations in the primary tuning capacitor. However, the parallel mode shows strong dependence on both the primary turns and primary tuning capacitor ... Read post

High-Efficiency Transference of Electric Power – 11m Single Wire

In this second part on high efficiency transference of electric power, we take a look at the characteristics and power efficiency of a cylindrical coil TMT system where the transmitter and receiver coils are spaced further apart in the mid-field region. In this experiment a single wire transmission medium 11m long is used to separate the coils into different rooms at the laboratory, and a remote camera is used to observe the power at the receiver load measured by an RF wattmeter. Transference of electric power over 11m, and the characteristics of a TMT system coupled by the LMD mode at this distance, is shown to be remarkably different from the close mid-field region, and requires a very different setup and configuration of the experimental apparatus in order to optimise the efficiency of power transfer up to 96% ... Read post

High-Efficiency Transference of Electric Power

In this post we take a preliminary experimental look at the transference of electric power using a cylindrical coil TC and TMT, energised using a linear amplifier generator, and also the high power transfer efficiency that can be achieved in a properly matched system. The setup, tuning, and matching of the linear amplifier is covered in detail in the video experiment where a 500W incandescent lamp can be fully illuminated at power transfer efficiencies over 99% in the close mid-field region. The power is shown to be transferred to the receiver through a single wire between the transmitter and receiver coil through the longitudinal magneto-dielectric mode, and not through transverse electromagnetic radiation or through direct transformer induction. This high-efficiency, very low-loss transference of electric power is possible as the dielectric and magnetic fields of induction are contained around the single wire ... Read post

Cylindrical Coil Input Impedance – TC and TMT Z11

In the first part of this post we look at the small signal ac input impedance Z11 for a cylindrical Tesla coil, and then two coils electrically connected together by a single wire transmission medium to form a TMT system in the near-field to close mid-field region. This TMT system is suitable for studying transference of electric power as a small-scale investigation of Tesla's wireless power[1], where the single wire transmission medium between the transmit and receive coils replaces the Telluric connection between the two grounded and spatially separated secondary coils. In the second part of this post we go on to use the measured Z11 to take a detailed look at the matching requirements for different types of generators to the cylindrical coil system, and the advantages and limitations of these generators when applied to the exploration of the properties and phenomena of electricity ... Read post

Tesla Coil Geometry and Cylindrical Coil Design

Tesla used a range of different coil geometries throughout his experimental work, including flat[1], cylindrical[2], conical[3] , and separated cylindrical secondary with an extra coil[4]. Each of these different geometries present different advantages and different limitations, and hence it is important for any experiment using a Tesla coil or TMT system to choose a coil geometry best suited to the type of experiment at hand. Different experiments are designed to study different aspects of electrical phenomena and qualities including, displacement and transference of electric power, radiant energy and matter, wireless, single wire, and low-loss transmission, longitudinal modes and cavity effects, plasma and dielectric effects etc ... Read post

Negative Resistance and the Self Generating Discharge – Part 1

Negative resistance is a feature of the I-V characteristic of a discharge between two electrodes, and if correctly utilised can lead to unusual electrical phenomena within an electrical circuit. In this first part on this topic we explore the I-V properties of the negative resistance (NR) region of a carbon electrode spark gap (CSG), or carbon-arc gap. When the CSG is biased into the correct region, and combined with a switched (non-linear) impetus from the generator, the impedance of the circuit can be seen to reduce from the conventional short-circuit case, increasing the current in the circuit and intensifying the light emitted from an incandescent lamp load ... Read post

Tesla’s Radiant Energy and Matter – Part 1

Some of the most fascinating areas of research into the inner workings of electricity, are those that display unusual and interesting phenomena, and especially those not easily understood and explained by mainstream science and electromagnetism. The field surrounding Tesla's radiant energy and matter, the apparatus, experiments, and wealth of unusual electrical, and even non-electrical related phenomena, is a particular case to note. This first post in a sequence serves as a practical and experimental introduction to this area, along with consideration and discussion of the observed phenomena, and possible interpretations as to their origin and cause ... Read post

Vector Network Analyser – DG8SAQ

This post on the Vector Network Analyser, the DG8SAQ by SDR-Kits[1-3], is the first in a sequence looking at how to use advanced test equipment to measure the properties, characteristics, and electrical parameters associated with Tesla coils and TMT transmission systems. The small signal ac input impedance characteristics Z11, and also the transfer impedance characteristics Z21, are used a lot in the experiments and measurements presented in this website, and yield a lot of fascinating and intricate dynamic data that can assist in the design, operation, matching and tuning of experimental apparatus suitable for experiments in the displacement and transference of electric power ... Read post

Transference of Electric Power – Part 2

In this second part on the transference of electric power we take a look at the differences that arise when a spark gap generator (SGG) is used as the power source for the experiment rather than a single frequency oscillator as used in part 1. It is recommended to study  part 1 before this second part, in order to gain an underlying understanding of the overall experiment, phenomena, results, and suggested interpretation of the experimental results, that are characteristic to the practical investigations in the transference of electric power ... Read post

Transference of Electric Power – Part 1

In this first part we will look at both video experiments and measurements to investigate and demonstrate the transference of electric power via the transmission medium of a single wire, and combined with and without multiple loads. The experiments are undertaken using the flat coils designed, measured, and tested in detail here. Part 1 of this topic is intended to experimentally introduce the transference of electric power, and the various properties, phenomena, and effects that can be measured within such an electrical system when excited using the vacuum tube generator as a feedback oscillator, details here ... Read post

ESTC 2019 – Tesla’s Colorado Springs Experiment

ESTC 2019, the Energy, Science, and Technology Conference[1], included a presentation and working demonstration by Eric Dollard on Tesla's Colorado Springs experiment[2] (TCS), which is available through A & P Electronic Media[3,4]. Due to unforseen circumstances relating to the demonstration co-worker, the generator for this experiment was unavailable after the demonstration for additional experimentation, investigation, and follow-up demonstrations. In agreement with Eric Dollard I suggested that the spark gap generator from the Vril Science Multiwave Oscillator Product[5], (MWO), could be adapted, tuned, and applied to the Colorado Springs experiment, and in order to facilitate ongoing investigation and experimentation throughout the conference period. What follows in this post is the story of how this successful endeavour unfolded in the form of videos, pictures, measurements, and of course the final results ... Read post

Spark Gap Generator Measurements – Part2

Part 1 of the spark gap generator covered the major components of the system, along with the design steps taken to build a diathermy replica unit (DR). In this part measurements are carried out both in the frequency and time domains, to further understand the operating characteristics, and how best to match the output of the generator to the experimental load. In this part there is also consideration as to how the generator transforms the incoming mains supply to an output suitable for experiments in the displacement and transference of electric power ... Read post

Spark Gap Generator – Part1

In the early days of my research, and before we built the spark gap generator, it was unclear to me which parts of the electrical system were most directly responsible for generating unusual electrical phenomena, whether it be the generator or high voltage source, the types and arrangements of the various coils, or a combination of these elements setup and arranged in a specific manner, tuned in a specific way, and operated in a specific method ... Read post

1920s H.G. Fischer Diathermy

Later in the research, (and after the replica diathermy unit had been designed and built), I was lucky enough to come across a real 1920s H.G. Fischer diathermy unit (HGF), which although being sold untested, and in unknown condition, looked suprisingly good from the pictures. It survived the shipping from the USA to the UK all in one piece, and on closer inspection proved to be in good physical and working condition, including the thermo-ammeter, and the original fuse. The only part missing was the 6V power indicator bulb ... Read post

Multiwave Oscillator Impedance – Part 2

In part 2 of the multiwave oscillator impedance (MWO) measurements we take a look at the high frequency impedance characteristics Z11 for the MWO resonator rings (top-load). The MWO Tesla style drive coil measured in part 1 needs to be separated from the MWO top-load for this type of measurement, because the impedance and load of the drive coil masks out any resonant features at higher frequencies, making it impossible to measure the MWO when connected to the top of the secondary coil and measured at the input to the primary coil ... Read post

Multiwave Oscillator Impedance – Part 1

The original Lahkovsky Multiwave Oscillator (MWO) apparatus combines two Tesla style drive coils in a transmitter and receiver configuration, each consisting of a primary and secondary coil cylindrically mounted on axis. The top-load for both transmitter and receiver is a complex combination of concentric half-wave resonators. The impedance characteristics of even a single drive coil with top-load represents a complex measurement challenge with results that can span over a very wide frequency range, in the order of 100kc/s - > 1Gc/s ... Read post

Vacuum Tube Generator (811A) – Part1

The vacuum tube generator (VTG) mainly used for experiments in the displacement and transference of electric power is based around a pair of 811A power triode vacuum tubes, of either RCA or Russian origin, and with electrical characteristics generally as defined in the RCA 811A datasheet. The 811A's have demonstrated to be highly flexible, with high reliability, and good overall medium power performance, versus cost and availability, when used in a variety of different configurations. The final output of this generator with these tubes can provide a maximum sustained RF output power of ~600W, and peak output for short bursts (up to 10s) of 900W, and over a wide frequency band up to ~5Mc/s ... Read post

Displacement and Transference – Part 1

As an experimental researcher it is normally always my preferred choice to share and discuss any theory I may hold about my work and the larger subject area according to the progression of the experimental work, and whether it corroborates or refutes any specific theory, principle, conjecture, or hypothesis I may hold. The principles that appear clear in my mind, regarding the displacement and transference of electric power, have guided the entire direction of my research efforts over a good many years to establish the validity or otherwise of these principles. In other words, I am designing and building the nature of my experiments in such a way as to attempt to reveal and test these working hypotheses and conjectures, and in so doing uncover and make further known the inner workings of the electrical wheel of nature ... Read post

High Voltage Supply

The high voltage (HV) supply was one of the first items to be designed and constructed, and has subsequently been modified quite a few times to become what is now a flexible and reliable source of high voltage and current at the line frequency of 50Hz (UK standard), and up to sustained power outputs of 1600W, and peak power outputs up to 2500W ... Read post

Single Wire Currents – Part 1

Part 1 of single wire currents investigates the voltages and currents generated in the secondary coil, and connected load circuit, when the primary is driven from a suitable generator. In this part the generator used is a high voltage vacuum tube oscillator which derives the feedback for oscillation directly from the dominant flat coil resonant frequency ... Read post

Flat Coil Impedance – Part 3

This part measures the impedance characteristics Z11 (magnitude and phase) for the flat coil in a range of different experimental scenarios. There are some preliminary results presented here in order to give an indication of the more complex frequency characteristics that exist within the experimental scenarios. The measurements and explanantion of the results presented here is still work in process and hence this post has not been fully finished at this time. As soon as time allows I will extend the range of measurements and experiments, and provide more detailed explanations and implications of the presented results ... Read post

Flat Coil Impedance – Part 2

In this second part full input, small signal, impedance characteristics Z11 (magnitude and phase) with frequency of a single flat coil are measured using a Vector Nework Analyser (VNA). The SDR-Kits Vector Network Analyser 3E (VNA-SDR) is predominantly used as it provides data directly connected to a computer. Some measurements have also been cross-measured and checked using a Hewlett Packard 4195A Network Analyser (VNA-HP), and particularly when an  equivalent circuit function is required to model actual device circuit equivalent values ... Read post

Flat Coil Impedance – Part 1

In the next sequence of posts the flat coil impedance characteristics are investigated using a range of different measurement methods. Understanding the flat coils impedance charactertistics with frequency is imperative if the coil is to be used optimally, and investigated accurately in experiments regarding the displacement and transference of electric power ... Read post

Flat Coil Construction

The flat coil design has provided the necessary dimensions and materials for the secondary and primary coil to be constructed. This post will outline construction of the 3S-1P flat coil described in Part 3 of the design. The complete constructed flat coil is shown in Figures 1. below, and gives an overall impression of how the coil has been mechanically designed to accommodate the required electrical coil design for a range of different experimental scenarios ... Read post

Flat Coil Design – Part 3

Following on from part 2 it has been establised that the primary and secondary coils will be so arranged to contain equal weights of conductor, dependent on the geometry of the specific conductors being used, and so to ensure the continuity of conductor boundary conditions and hence the balance, continuity and coherence of the electric and magnetic fields of induction between the primary and the secondary coils ... Read post

Flat Coil Design – Part 2

The final coil required for the purpose of experiments to be undertaken in the displacement and transference of electric power, is a loosely coupled air core resonant transformer, or what has become known as a "Tesla Magnifying Transmitter" (TMT), sometimes also referred to as a "Magnifying Transformer" (MT), and described in more detail by Tesla[1,2], and notably through subsequent investigations by Dollard[3], amongst others ... Read post

Flat Coil Design – Part 1

The flat, spiral, or pancake coil, applied to the transmission of electric energy was presented in a patent by Tesla[1] in 1900, subsequently investigated by Dollard et al.[2], Mackay et al.[3], and no doubt by others. The design, implementation, and measurement of a flat coil is presented in the following sequence of posts. This coil has then been used in a range of experiments including single wire effects, wireless transmission of power, and investigations into the properties of displacement and transference of electric power. These experiments, and there results so far, will be reported in a subsequent sequence of posts ... Read post