Understanding transmission lines is an important part of the art of radio--the proper selection and use of a feedline is often more important than the choice of radio. This is particularly true of multiband antennas fed with tuners--it is possible to lose several S-units of transmit signal strength by making poor decisions.
- Understanding SWR by Example
QST November 2006
- Measuring Cable Loss
QEX May/June 2005
- Better Feedline Loss Measurements with Antenna Analyzers
QST March 2004 Hints and Kinks
- Measuring Cable Loss
QEX, May 2005, pp 44-46
An improved-accuracy method of measuring coaxial cable loss with antenna analyzers.
- Using 1/2-Inch 75-Ohm CATV Hardline
QST January 2000, p. 91 (World Above 50 MHz)
Consider using Hardline when planning a VHF/UHF repeater or even a home station.
- Don't Solder to Connector Adapters!
QST December 1995, p.76 (Hints and Hinks)
A warning about the installation of PL-259s to smaller coax cable.
- "My Feed Line Tunes My Antenna!"
QST November 1991, pp. 33-35
A discussion on how the feed line can change the resonant frequency of the antenna.
- The Whys of Transmission Lines Part 1
QST January 1965, pp. 25-28
A beginner’s guide to transmission lines.
- The Whys of Transmission Lines Part 2
QST February 1965, pp. 24-26
Standing-wave ratio and line losses
- The Whys of Transmission Lines Part 3
QST March 1965, pp. 19-22
Putting the antenna and line together
- Another Look at Reflections
Everything you wanted to know about SWR … and then some.
- The SWR Obsession
QST, April 1994, pp. 70-72, 74
What is your SWR meter really saying?
- The Lure of the Ladder Line
QST December 1993, pp. 70-71
Discussion of some advantages to using ladder-line in place of coax to feed multiband dipoles.
- Proving the Conjugate Matching Power Theorem
QEX July 2000, pp. 55-58
- Let's Talk Transmission Lines
QST June 1997, pp. 57-59
Coax or ladder-line? Which dielectric? How do I reduce losses?
- Opening Lines: A Short History of Coaxial Cable
QST August 2001, pp. 62-64
Nothing technical, just why coax is.
Hardline connectors made out of copper plumbing hardware. Installing PL-259s on aluminum CATV Hardline using a barrel connector and a copper pipe adapter.
Kenneth L. Nist, KQ6QV has free software for calculating arbitrary transmission line impedance, as well as transmission line equations for Mathcad 11.