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An overview of radio telemetry, concentrating on low power, short‐range systems which can be operated without equipment licences. Describes transmission mechanisms, aerials and the two main types of analogue modulation: amplitude modulation (AM) and frequency modulation (FM).Outlines the...
A report from a seminar on advanced sensing held on 9th November 1993 as part of the DTI Advanced Sensors Technology Programme (ASTTP). The first subject covered was multiplexing for control systems and looked at the present diversity of bus systems supporting field devices from the viewpoint of...
Looks at radio frequency design relating to the expanding field of data transmission with the arrival of purpose‐made modules, particularly at 418MHz. Describes the three main types of antennae to be considered at 418 MHz, the vertical whip, the tuned loop and the helical. Discusses the...
Describes the basic principles of radio remote control, dealing specifically with safety aspects, transmitters, receivers, transmitted telegrams, the Hamming code to indicate the origination of errors, and emergency stop circuits. Concludes with the specification for DTI approval in the UK and a...
Reports on the research and development work carried out at Central Research Laboratories Ltd (CRL), concentrating on their physical and chemical sensing techniques and the manufacture of sensors based on silicon field effect transistors (FETs). Describes the use of FETs in ion sensitive field...
Describes the increasing need for simple and efficient antennas and looks at the performance of quarter wavelength and helical antennas. Concludes the optimum performances from both antennas are ruled by the choice of a suitable ground plane. The helical antenna is capable of producing a...
Describes how radio telemetry can interface with process control systems such as supervisory control and data acquisition (SCADA) and distributed control systems (DCS) greatly increasing their power and efficiency. Outlines the basis of radio telemetry, the behaviour of electromagnetic waves,...
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