Passive RFI Generators Inside and Outside Your Station
It is not unusual to be able to hear the harmonics of a nearby transmitter, amateur radio or not. No signal is a perfect sine wave and it’s easy to […]
An Amateur Radio Blog by DX Engineering Articles written by: Ward Silver, N0AX
Technical Articles
Field Day / Technical Articles
HF Summertime Propagation…with Propagation Advice for Field Day
SummertimeOperatin’ is easySunspots jumpin’Your antenna’s up highThe openings switchThose bands just keep changin’The regions and seasonsTell you why(apologies to George Gershwin and DuBose Heyward) It seems like just a few […]
Technical Articles
Getting the Most from Portable HF Antenna Systems
Portable operating—in parks, on islands, atop summits—has become delightfully popular over the past few years. It’s not hard to figure out why, either. You get to combine visiting new places, […]
Uncategorized
Baluns and Common-Mode Impedance: How Much is Enough?
There is a lot of interest in baluns these days—that’s good. There is also a lot of confusion about baluns these days—that’s not so good. This article starts by defining […]
Antenna Tech / Technical Articles
How to Build Aluminum Antennas
Next to wires, antennas made of aluminum tubing and rod are the most common type of amateur radio antenna construction. There is a wide range of high-quality aluminum alloy available, […]
Amateur Radio News
The Yasme Foundation–Part of DX History
Editor’s Note: Thanks especially to Hamgallery.com, managed by Tom Roscoe, K8CX, for several of the images used here. There are many, many more wonderful photos and graphics on his website […]
Antenna Tech / Technical Articles
An Overview of Beverage Receiving Antennas–What Makes Them So Special?
(Thanks to the ARRL for sharing Figures 1-3 from the article “The Beverage Antenna, 100 Years Later” in the November 2021 issue of QST—see the reference list below.) There is […]
Technical Articles
Powdered-Iron Cores: How Do They Compare to Ferrite?
In an earlier OnAllBands article (“What Is Ferrite, Anyway?”) I explored the use of ferrite cores for chokes, baluns, and other amateur radio applications. In recent years, ferrite-core components like […]
Technical Articles
How to Check Rotators from the Ground
If you have ever stood at the base of a tower, looking forlornly upward, wondering “What’s WRONG with that [adjective] rotator?!” you are not alone. That simple piece of gear […]
Technical Articles
Feeding End-Fed Antennas
“End-fed” antennas, in particular the “End-Fed Half-Wave” (EFHW), are all the rage these days, particularly for portable operation. Throw a string over a tree branch, haul up one end, connect […]
