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.
- Another Look at Reflections
The classic article series on transmission lines by M. Walter Maxwell, W2DU. Well worth reading if you wish to understand SWR and its effect on system efficiency
- 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
- 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.
- 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.