Articles written by: Ward Silver, N0AX

Technical Articles

Inductor Selection: Manufacturers Part Numbers

Amateurs have long used the Amidon (www.amidoncorp.com) part numbering system for ferrite and powdered iron toroid cores. For powdered iron cores, the Amidon part number begins with a T and […]

Technical Articles

Inductor Selection: Design Sensitivities

When you start designing your own circuits, one of the biggest challenges is not obtaining component values, but choosing from many different types of components all having the same value! […]

Technical Articles

Tips for Battery Replacement in Computers, Radios, or Lab Equipment

Due to the lower cost and better performance of non-volatile memory, it is now a common feature of microcontrollers. This reduces the need for batteries to provide backup power to […]

Technical Articles

CW Contesting (Part 2): Making QSOs for Real and Tips on Better Scores

In Part 1 of our series on CW Contesting, we looked at some of the basics of getting started. Today, we’ll delve further into making QSOs and tips on improving […]

Technical Articles

CW Contesting (Part 1): Getting Started

Most days, the CW bands are kind of quiet.  But on certain days, suddenly there are stations tuning up, conducting short QSOs, and then at the top of an hour […]

Technical Articles

Using Transformers for Impedance Matching vs. Isolation

Transformers for Impedance Matching One of a transformer’s important functions is impedance transformation. Impedance transformation is just changing the ratio of voltage-to-current in one winding to a different ratio of […]

Technical Articles

Guide to Low-Power Contesting (Part 2): Techniques and Tips on Making QSOs

In Part 1 of our series on low-powering contesting, we looked at the basic equipment you’ll need. Today, let’s touch on a few tips on competing, contest resources, and opportunities […]

Technical Articles

Guide to Low-Power Contesting (Part 1): Getting Started

Field Day was fun, wasn’t it?  Maybe you’re thinking, “I can do that from home!” And so you can—this discussion is about how to have some success with a modest […]

Technical Articles

What To Look For in Your First Mobile Rig

After getting a license, there are so many things to learn! One of the biggest (and the most fun) is what you learn as you choose your radio. This article […]

Technical Articles

How to Put up a Field Day Tower Safely

Field Day (June 22and 23, 2019) is almost here and the planning is underway — for radios, tents, food, antennas—and how to keep them up!  You may be lucky and […]