Rohde & Schwarz
Rohde & Schwarz

MultiCarrier Modulation, MCM Techniques

Multicarrier modulation is now widely used, especially in the form of OFDM. However the principle is used in many other formats that are being researched for future applications.

HSPA, High Speed Packet Access, Tutorial

Essentials of HSPA or High Speed Packet Access, developed by 3GPP, provides high speed data for 3G UMTS cellular telecommunications systems.


Capacitor Types - An Overview

Essentials about the different types of capacitor that are available: performance, construction, specifications, parameters, advantages, disadvantages of the differnet capacitor types and where they are best used.

Capacitor Smoothing Circuits & Calculations

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

Facts of the day

20 August 2014

History - It was on 20th August 1920 that the first commercial radio station, 8MK (WWJ), began broadcasting in Detroit, Michigan, USA.

Quote - All religions, arts and sciences are branches of the same tree. All these aspirations are directed toward ennobling man's life, lifting it from the sphere of mere physical existence and leading the individual towards freedom. - Albert Einstein

The way things are - If you cannot understand something, then say it is intuitively obvious.


LED Lighting Power Supplies

Andrew Bryars, Technical Manager, XP Power provides an engineer’s guide to selecting power supplies for LED lighting applications.


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

GPS GLONASS, Galileo and BeiDou for Mobile Devices
GPS GLONASS, Galileo and BeiDou for Mobile Devices

Ivan G Petrovski
Location services are an increasingly important element for mobile handsets....
Read more . .

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