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How it Works: The Electronic Motor Speed Controller | |
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How it Works: The PPM Radio Control System - Part1 | |
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How it Works: The PPM Radio Control System - Part2 | |
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How it Works: The PPM Radio Control System - Part3 | |
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General Info: The U.K. Radio Control Bands | |
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General Info: Understanding Resistor Value Coding | |
| 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. |
MECTN001.PDF (53k) |
| 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. |
MECTN003.PDF (58k) |
| 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. |
MECTN004.PDF (43k) |
| 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. |
MECTN005.PDF (40k) |
| 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. |
MECTN101.PDF (25k) |
| 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. |
MECTN201.PDF (46k) |
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