THRU-THE-EARTH RADIOLOCATION
Home
About
Contact
Thru-the-Earth Gear
Basic-1 & Basic2 Radios
Locating Ground Zero
DQ Radiolocation Receivers
Class-E Underground beacon for DQ receivers
>
Best Inductance Equation
SSB voice Transverter
The Single-Wire Ultraphone
Technical Articles
Applications
Antarctica
Commercial Applications
Links
These articles are in downloadable PDF format
Radio Location Accuracy Report by Charles Bishop, 1974. Carefully done with tons of data!
Short Radio Location accuracy presentation based on the above paper (2023)
Radiolocation and Communications on Bill Stone's 2023 Expedition to Cheve in Oaxaca, Mexico
A miniaturized radiolocation beacon with a ferrite core antenna for easier deployment in caves.
The Pease Ultraphone - a Single Wire Telephone for extreme conditions.
Data transmission through a long single wire phone line
Thru-the-Earth 2-way voice communications with cave divers using acoustic diver voice gear converted to RF.
Locating Ground Zero by the shape of the magnetic field
Radiolocation at Wakulla Springs, Florida, CREG Journal 37
Real time tracking of an underwater beacon. This was written for tracking Bill Stone's Endurance vehicle under ice in Lake Bonnie Antarctica, but also applies to divers in underground springs and to dry caves as well.
Converting CB radios (or ham radios) for use as low frequency cave radios, by Ian Drummond
An Improved Version of Ian Drummond's CB to 185kHz Transverters, by Brian Pease
Determining the Optimum frequency for Thru-the-Earth communications with loop antennas - theory and actual tests.
Obtaining and using an Experimental license from the FCC in the years prior to Radio Amateur access to the 2200 and 630 meter bands
Overview of the original 3496Hz "DQ" Beacon receiver from CREG Journal 24
Constructing the 3496Hz DQ Beacon receiver, from CREG Journal 28
Depth by Radiolocation, an Extreme Case. Includes theory and conductivity measurement.
Conductivity at Castleguard Meadows, from CREG Journal 27
Thru-The-Earth (TTE) texting using a computer sound card with a very simple interface.
A 500 Watt 15kHz beacon received at 2km range with pocket-size antennas. Full construction article!
Update on TTE texting, using WSQ "Cave Radio" at 5kHz
Calculating the inductance of ferrite rod antennas and measuring the approximate permeability of ferrite rods.
Selection of a tablet for cave surveying.
Paperless Cave Surveying update- DistoX, TopoDroid, Tablets.
An experiment to directly measure the optimum frequency for a given TTE path.
The famous Mark Mallory article on load-invariant Class-E amplifiers
A new miniature piezoelectric VLF dipole antenna for TTE communications. Is it better than a simple loop?