This page contains an index of technical articles and data 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
Five page article, with photographs, showing the construction of a prototype HF amplifier on a PCB and it's assembly into a FLEXI-BOX.
How does an antenna work?
A detailed analysis of the real behaviour of an antenna in a series of articles.
Antenna Current Distribution
Antenna Voltage, Phase, Power and Impedance Distribution
Antenna Near Field Radiation
Elevation of Antenna Radiation
How does a stub filter work
An analysis of a sine wave signals behaviour in a stub filter.
An explanation of how to use the LINEST function in Excel.
An explanation of how to use the LOGEST function in Excel.
Characteristic Impedance of PCB tracks using a Vector Network Analyser
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
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 including E12(10%), E24(5%), E48(2%), E96(1%), E192(0.5%)
RF Trap With Attenuators circuit description
A circuit description of this unique FLEXI-BOX project.
The importance of using calibration standard definitions
for a Vector Network Analyser
An article investigating the need to use standard definitions for a Vector Network Analyser analyzer.
Understanding Coaxial RF Transmission Lines by Measurement and Calculation
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.