Telluric Transference of Electric Power – MF Band 27-70 Miles

This experimental post is a follow on from the field-work reported so far in Telluric Transference of Electric Power – MF Band 2-8 Miles and Transference of Electric Power – Single Wire vs Telluric. In this new experiment the same TMT apparatus and generator is used at 1.86 Mc and 400W of transmit power, and the telluric transmission medium is extended into the far-field region at 27 and 70 mile field locations from the TX coil. At the 27 mile location a natural lake was used as the telluric ground connection for the RX coil, and the transmitted signal could just be received, and was shown to result from the combination of a telluric-wave component through the ground, and a radio-wave component above the ground. At the 70 mile location the sea was used as the telluric ground connection, but despite many different combinations of configuration, tuning, measurements, and instruments, the transmitted signal could not be received either through the telluric-wave or the radio-wave. The dominant transmission mode in these experiments appears to be Transverse Electromagnetic (TEM), and it is conjectured that in the more distant far-field a three coil TMT arrangement using Tesla’s extra coil may be necessary to “pull” or “draw” the transmitted signal through the coherent cavity via the Longitudinal Magneto-Dielectric (LMD) transmission mode.

The video experiment demonstrates and includes aspects of the following:

1. Portable Tesla receiver (RX) setup and tuning, using a cylindrical coil tuned in the 160m amateur radio band, for radio-wave and telluric-wave field experiments in the far-field region.

2. Telluric ground connection using a submerged aluminium metal plate, firstly in a natural lake 27 miles from the lab transmitter (TX), and secondly in the sea at 8 miles from the TX.

3. Small signal ac impedance measurements using a vector network analyser, to tune the RX Tesla coil to the series and parallel resonant modes.

4. Fine tuning to different modes, and optimal received signal strength at 1.86Mc, using a telescopic aerial at the top-end of the RX secondary coil.

5. Comparison of radio-wave and telluric-wave measurement by re-tuning the RX coil from the Telluric ground plate connection, to an ungrounded single wire bottom-end extension.

6. At 27 miles the TX signal could be received and was just audible with a TX input power in the range 20-400W. At 70 miles no audible tone could be detected at either the parallel or serial modes.

7. The lower parallel resonant mode of the RX Tesla coil was found to receive the maximum signal strength at 27 miles.

Video Viewing Note: To Improve clarity of the very small audio tone received from the transmitter, an audio spectrum analysis pane is added to the video during the receiver experiments. The tone is only just audible in the video, and can be confirmed when a steady 335-343Hz peak appears in the audio spectrum analysis.

Two-Coil Telluric Transmission and Next Steps

In this experimental post is has been demonstrated that telluric transference of electric power was possible over 27 miles using a 1.86Mc cylindrical coil TMT system, although the signal was very small and could only just be detected. At 70 miles no signal could be received either from the telluric-wave or radio-wave. The results received in this experiment are consistent with those obtained in previous telluric transference of electric power experiments, and also Telluric Transference of Electric Power – Brookmans Park AM Radio Transmitter, where it was demonstrated at 909kc that only ~ 50mW of power could be received at the Tesla transformer receiver 300m (approximately one wavelength) from a 150kW broadcast radio transmitter station. It appears from all the results obtained so far for telluric transference of electric power, that the following preliminary conclusions can be drawn:

1. The frequency of the generator, 1860kc and 909kc, leads to very high power absorption losses in the earth close around the transmitter ground system, resulting in very little transferred power through the ground.

2. The tension or “pressure” exerted on the Tesla transformer receiver coil was extremely low even when connected to a ground node, natural water feature, or the sea, and only tiny amounts of power could be received and transformed into the primary circuit at the receiver.

3. Mismatched transmission modes of the TX (TEM) and RX (LMD) in the case of the radio station transmitter, where there is no coherent tuned cavity formed between the two in the telluric channel as there would be in a complete TMT system.

4. The size, extent, and low impedance of the ground connection at both the TX and RX would be critical in the currently investigated telluric transmission in order to minimise signal loss at all stages of the transmission. This huge signal loss across all parts of the transmission medium implies that the TEM mode of transmission is dominant over the LMD mode.

In view of these results it appears clear that the transmitter is not able to “push” the transmitted signal from the TX to the RX in the TEM mode through the ground, there is simply no mechanism for this which does not lead to very high absorption of the transmitter power in the earth. At close to medium far field distance the TEM mode can reach the receiver coil both through both telluric-wave and radio-wave transmission, and decays in signal strength over the distance as we would expect for a normal radio transmission. In all the telluric experiments undertaken so far it appears that the LMD mode has not been adequately established between TX and RX outside of the near mid-field region. It is conjectured that in order to establish the LMD mode between TX and RX in the far field it would be necessary to establish a coherent cavity between the two coils, where transmitted power can be “pulled” or “drawn” through the transmission medium to the receiver. It may be possible to establish this coherent cavity using a three-coil system employing Tesla’s extra coil at the transmitter and receiver, which is also a closer reflection of Tesla’s original magnifying transmitter system. It is further conjectured that the extra coil will assist in creating a cavity between the secondary and extra coil, and hence down into the ground system.

Next steps are to continue to explore Telluric Transference of Electric Power at a range of field locations using a three coil TMT system including Tesla’s extra coil, and then at lower frequencies, and ultimately if possible down into the LF-band where Tesla was working with his own experiments. Lower frequency experiments present considerable challenges, including TMT size and scale, generator type and compatibility, radio regulation and licensing, availability of field locations, and resourcing and funding. If these challenges can be overcome then it may be possible to finally confirm or refute the possibility of high-efficiency telluric transference of power, and understand in much greater detail and accuracy the legacy that Tesla has left us to explore.


1. A & P Electronic Media, AMInnovations by Adrian Marsh, 2019, EMediaPress

2. Dollard, E. and Energetic Forum Members, Energetic Forum, 2008 onwards.