For those interested in learning a little more about the multi-faceted subjects of radio control and electronics in general, we are offering a series of Technical Notes. Each of these takes a subject related to electronics or radio control and explains it in, what we hope is, an easy-to-understand way. Mathematics and formulae have been kept to a minimum and, in many cases, left out altogether.

For each Technical Note on this page there is a brief description of its contents and a rough guide as to its file size. To start off the download process right click the 'PDF' icon and select the 'Save Target As' option, or your web browsers equivalent, which should present a Save dialogue box from where you can select a destination folder.

 

The Technical Notes are available in .PDF format.
To obtain the free reader click the Get Acrobat icon.
 



Quick Finder - click in this list to jump straight there

How it Works: The Electronic Motor Speed Controller

How it Works: The PPM Radio Control System - Part1

How it Works: The PPM Radio Control System - Part2

How it Works: The PPM Radio Control System - Part3

General Info: The U.K. Radio Control Bands

General Info: Understanding Resistor Value Coding
     



How it Works: The Electronic Motor Speed Controller

This Technical Note offers an insight into the workings of the modern speed controller. It includes a functional description plus some oscilloscope shots showing the waveforms from a typical unit. In addition a glossary is provided giving an explanation of many of the features seen on the latest designs.

 Download the full Tech. Note here


MECTN001.PDF (53k)

How it Works: The PPM Radio Control System - Part 1

This Technical Note is divided into 3 parts with this part describing generally the terms and processes involved in communicating by radio. Using plenty of diagrams it covers basic radio techniques and goes on to provide simplified block diagrams of the various circuit sections contained in transmitters and receivers.

 Download the full Tech. Note here


MECTN003.PDF (58k)

How it Works: The PPM Radio Control System - Part 2

This second part of the Technical Note builds on the first and describes the operation of a typical low-cost 27MHz AM R/C transmitter but, because the principles involved are similar, most of the circuitry described is applicable to both AM and FM units operating on any of the frequency bands.

 Download the full Tech. Note here


MECTN004.PDF (43k)

How it Works: The PPM Radio Control System - Part 3

The final part of this Technical Note examines the final link in the communication chain. Again using plenty of diagrams, it describes how the receiver performs the two main functions of receiving the wanted RF carrier and decoding the transmitted information into signals suitable for driving the individual servos.

 Download the full Tech. Note here


MECTN005.PDF (40k)

General Info: The U.K. Radio Control Bands

This Technical Note gives specific information relating to the frequency bands licensed for use in the U.K. For each band details of the channel frequencies and their identification method are provided as well as maximum radiated power levels. It has recently been updated to include the 10 new channels in the 35MHz band.

 Download the full Tech. Note here


MECTN101.PDF (25k)

General Info: Understanding Resistor Value Coding

This Technical Note provides an insight into the 'prefered value' system of designating resistor values and gives a detailed description of some methods used to indicate a component's value. It shows how to read the coloured bands and also covers the more recent system making use of alpha-numeric coding.

 Download the full Tech. Note here


MECTN201.PDF (46k)