Rohde & Schwarz
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Gunn Diode Tutorial

Gunn diode or Transferred Electron Device tutorial with information about its use in microwave applications and its structure, technology, and operation.

GSM EDGE Network Architecture

Overview or tutorial about the basics of the enhancements required for the GSM EDGE network architecture including the GGSN and SGSN.

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Frequency Modulation Advantages and Disadvantages

Summary of the advantages and disadvantages of frequency modulation, FM, detailing why it is used in certain applications and not others.

NFC Security

Notes and details about NFC, Near Field Communications security and the issues related to ensuring secure communications.

Facts of the day

27 January 2015

History - It was on this day in 1880 that Thomas Edison filed his patent for an electric incandescent lamp

Quote - Although human subtlety makes a variety of inventions by different means to the same end, it will never devise an invention more beautiful, more simple or more direct than does nature, because in her inventions nothing is lacking, and nothing is superfluous. - Leonardo da Vinci.

The way things are - Any new circuit design will contain at least one part that is obsolete, two parts that are unobtainable and three that are still under development.

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GPIB IEEE 488: Operation & Protocol

Notes and summary about the GPIB, or IEEE 4888 bus - how it works, the protocol and the purposes of the various lines.

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Antenna directivity and gain

Overview, summary, tutorial about the basics of RF antenna directivity (aerial directivity) and gain including isotropic radiators, polar diagrams and antenna dBi figures and antenna dBd figures.

 

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