Transmission Line Experiments
Evidence and theory suggesting our understanding of electromagnetic radiation may be incomplete. An exploration of what we don't know about light.
ResearchOpen Source Hardware Projects
Links to hardware projects which may be obtained completely assembled directly from the manufacturer, or built yourself from full source files.
OSHWSome Thoughts on HOA Antennas
Slides from a short presentation to the San Juan County Amateur Radio Society club, 9 February 2024.
PDF · 2024Another Look At Transmission Lines RadComm+ · RSGB
The common theory for coaxial line which has its basis in a circuit model by Heaviside from the 1880's is at odds with the physics expressed by Einstein and Schelkunoff. Previous articles have shown theoretical results and practical applications from a newer understanding. This article further discusses some of what we've missed, why we've missed it, and why it might matter.
SWTL Summary and Demonstration Pacificon 2016
A summary of the Surface Wave Transmission Line (SWTL) technology, demonstrations, and related activities. Note: this is not "G-Line" as described by Goubau (which required slowing the wave down), nor is it the same as what Tesla described.
Transmission and recovery of 144 MHz power guided along a single 0.013" (0.32 mm) conductor at 144.5 MHz using very lightweight launchers. This system can power quadcopters/aerostats for continuous flight while providing an extremely low-loss connection to elevated antennas — enabling quickly deployable, long-range, very high bandwidth communications for Internet, emergency, and other uses.
Transmitting real power across a short single 0.013" (0.32 mm) conductor Surface Wave Transmission Line (SWTL) at 146 MHz.
Any Ham Can Have a 400′ Tower! Pacificon 2015
October 2015 Pacificon Presentation on SWTL and aerostat technology.
Using SWTLs to Power Multi-Rotor Aircraft Supporting a High-Altitude Antenna
A method for keeping a quadcopter or other motorized aerostat aloft permanently while simultaneously supporting and feeding antennas at great height.
Propagation Measurement Using a Quadcopter QEX May/June 2016
Describes the use of a quadcopter to measure relative attenuations due to beam deformation by ground and attenuation due to terrain and foliage absorption. (Reprinted with permission, ARRL.)
At the Pacificon 2011 Antenna Forum, I gave a presentation covering three different amateur applications for surface wave transmission line, along with a new antenna theory for understanding conventional antennas such as dipoles and monopoles as surface wave devices. All but the first have been published as a three-part series in ARRL QEX.
A Flying Antenna YouTube only
A helium-balloon-supported, very broadband antenna made from paper, producing 40+ dB gain.
A Surface Wave Transmission Line QEX May/June 2012
A New Antenna Model QEX July/Aug 2012
A new antenna theory describing a dipole (or monopole) as a surface wave device. (Reprinted with permission, ARRL.) See errata below.
All-Band Antenna QEX Nov/Dec 2012
An antenna providing operation from 160 m through 3 cm on a single structure.
Letters from Readers QEX Sept/Oct 2012
"A 40+ dB Gain Antenna Made From Paper" — The Flying Antenna Video
-
What's the Problem with Amateur Packet Radio?
Selections from an introductory higher speed packet presentation at the September 1996 ARRL/TAPR Digital Communications Conference, with additions on improving higher-speed amateur networks.
-
ARRL Conference Papers
Theoretical basis and practical development of higher-speed amateur radio networks.
- On-Channel Active Repeaters
- Old Antennas
-
Old Microwave Link Hardware
Other old hardware projects.