Rohde & Schwarz

What is VoLTE, Voice over LTE

Details of VoLTE Voice over LTE the IMS IP Multimedia Subsystem based technology supported by GSMA for providing a unified format for Voice traffic over LTE channels.


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

Capacitor Smoothing Circuits & Calculations

Notes, details & calculations for smoothing capacitor circuits used with rectifiers with details of ripple voltage and ripple current.


What is a Phototransistor?

Multipage easy to read phototransistor (photo transistor) tutorial providing details about phototransistor its properties, how it works and how it is used.

Facts of the day

23 April 2014

History - It was on 23 Apr 1858 that Max Planck was born. He was a German theoretical physicist who introduced the quantum theory in 1900, for which he was awarded the Nobel Prize for Physics in 1918.

Quote - All truths are easy to understand once they are discovered; the point is to discover them. Galileo Galilei

The way things are - A computer makes as many mistakes in two seconds as 20 men make in working for 20 years.


How to use a Spectrum Analyzer

Key essentials, hints and tips about using a spectrum analyzer: how to use one to make radio frequency tests and measurements.


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

Dilbert from

Sensors, Actuators, and Their Interfaces: A Multidisciplinary Introduction
Sensors, Actuators, and Their Interfaces: A Multidisciplinary Introduction

Nathan Ida
Sensors and actuators are becoming increasingly important. While they had...
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