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 […]
An Amateur Radio Blog by DX Engineering Articles written by: Ward Silver, N0AX
Technical Articles
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! […]
Clifton Labs / Technical Articles
Using Copper Tubing Windings on a Binocular-Core Transformer
It is often effective to use copper tubing as single-turn winding on a binocular-core transformer. The tubing has extremely low losses and minimizes leakage inductance which extends the transformer’s high […]
Clifton Labs / Technical Articles
Permeability and Ferrite Material
Since the article was written in 2008, other types of ferrite material have been introduced with different characteristics over the MF and HF frequency ranges. Type 31 has become popular […]
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
How to Protect Wire from Ferrite
Before winding wire, particularly enameled wire, on a bare ferrite core, take steps to protect the wire from the abrasive ferrite’s edges and corners. If the core has an inside […]
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 […]
