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Printed Circuit Board. Are usually made of Fibreglass or SRBP (Synthetic Resin Bonded Paper) with a copper laminate on one or both sides, forming the electrical circuit. A detailed Wikipedia article is available here. Most MERG Kits contain a PCB, the majority of them are single sided through hole construction. As the electronics become more sophisticated so double sided and surface mount technologies are being introduced.
Software for producing the “Gerber” files which are used in the etching process to produce the required PCB’s
The PECO implementation of the Point motor, notable because they are constructed so as to be directly attached to both N and 00 gauge PECO track, thus making it easier to line up the pull and throw of the point
Phase Modulation. A specialist modulation mainly used in Radar equipment, the phase rather than the frequency of the carrier wave is varied in order to obtain information
A complex integrated circuit which may be programmed to carry out a controlled sequence of events, ie certain output events controlled by an input event
A piece of electronic kit designed by Gordon Hopkins which may be used to switch fast action point motors See TB G16/14
A piece of electronic kit designed by Gordon Hopkins which may be used to switch slow action point motors See TB G16/15
Solenoid Point motor /relay driver with onboard relay see TBG16/26
An electro mechanical device for switching points. There are many examples of point motors, some are fast solenoid switched and others slower acting motor switched
A track based device for manually or electrically switching one input track to two or more tracks, or two or more tracks into one track. Also called turnouts in NA.
Abbreviation for Potentiometer see below
Power to the track is divided into sections. Can be to assist fault finding, to avoid shutting down the whole layout if a short occurs, and in large layouts to provide separate power supplies one to each district.
A controller including a power supply to the track.
The activity of entering a list of instructions that a computer can act on. That is “run” the programme. These instructions take the form of a programming language that the computer can understand.
The means to facilitate manually driven trains following one another on the same track but in different electrical sections powered by different controllers. (See MERG Journal August 2005 page 10)
Power supply unit
RPC System - PTP (Point-to-Point)
Self contained (non-PC) automatic data transfer system for up to 960 functions each way, using standard RPC Modules. Includes PCBs and all components.
Can be any shape and is normally a short period of time
There are basically 3 forms of pulse modulation, Amplitude, Position, and width, each having its own characteristics and uses. This type of modulation may be superimposed onto RF or on DC voltages.