Rohde & Schwarz

Quality Factor Q Tutorial

Q Factor or Quality factor used with inductors and other items in resonant circuits to indicate resistive losses, resonant sharpness. It is a key parameter in any filter design.


Comparison of 8-QAM, 16-QAM, 32-QAM, 64-QAM 128-QAM, 256-QAM, etc

Comparison between 8 QAM (8QAM), 16 QAM (16QAM), 32 QAM (32QAM), 64 QAM (64QAM), 128 QAM (128QAM), and 256 QAM (256QAM), - forms of Quadrature Amplitude Modulation

Zener Diode Circuits and Applications

A summary or tutorial covering the essentials of the Zener diode or voltage reference diode used in many power supply and other circuits.

Facts of the day

31 July 2014

History - This day in 1910, wireless was used for the first time to apprehend a criminal, Dr Crippen - who was escaping from UK. The ships captain spotted him and informed the authorities enabling him to be arrested.

Quote - I think there's a world market for about five computers.- Thomas Watson, founder of IBM. Said well before the introduction of any PCs!

The way things are - A failure will not appear until a unit has passed final inspection.


Wi-Fi 802.11 Channels & Frequencies

List of Wi-Fi / WLAN / 802.11 bands, their channel frequencies and bandwidth, 2.4 & 5 GHz allocations worldwide, & summary of which WiFi channels can be used together. news from

Applied Optimization Methods for Wireless Networks
Applied Optimization Methods for Wireless Networks

Professor Y. Thomas Hou, Dr Yi Shi, Professor Hanif D. Sherali
The use of wireless networks has increased dramatically in recent years. In...
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