Technical Articles

This page contains an index of the technical articles on our website.

Accurate Method for Measuring Relative Dielectric Constant of a PCB Using a Vector Network Analyser analyzer and parallel plates.
Single page method, condensed from the five page article  below, for those in a hurry. Uses a VNA and has an accompanying calculator.

Building a HF amplifier in a FLEXI-BOX Part 1
Five page article, with photographs, showing the construction of a prototype HF amplifier on a PCB and it's assembly into a FLEXI-BOX.

Logest Function
An explanation of how to use the LOGEST function in Excel.

Measuring Characteristic Impedance of PCB tracks using a Vector Network Analyser Part 1
Three page article which expands on a method from Transmission Lines and Networks by Walter C. Johnson, McGraw-Hill 1963 p155 Para 4.7 Measurement of the Characteristics of lines. With an accompanying calculator.

Measuring Relative Dielectric Constant using parallel plate method and Vector Network Analyser Part 1
A five page article that describes how Chemandy Electronics investigated an accurate parallel plate measurement method using a Vector Network Analyser. With an accompanying calculator.

Preferred Resistor Values
A table of preferred resistor values

RF Trap With Attenuators circuit description
A circuit description of this unique FLEXI-BOX project.

Understanding Coaxial RF Transmission Lines by Measurement and Calculation Page 1
A lengthy study of coaxial cables and transmission line theory in simple, logical steps, using a method of measurement and calculation. Hard going and sometimes deviating from classical transmission line theory, this slowly growing article will hopefully shed light on a difficult but intriguing subject.

VHF Pre-amplifier Description
A circuit description of a common base configuration pre-amp that can be used in local or remote powered modes.