Rohde & Schwarz
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.


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.

IMPATT Diode: Operation & Theory

Essential details about the operation and theory behind the IMPATT diode, explaining how it works and how this impacts on its operation.


Current Sense Transformer Performance

Paul Lee, Director of Business Development, Murata Power Solutions UK, describes some techniques to employ to achieve best performance for current transformers used for monitoring, control and protection


Op Amp Gain Calculations & Tutorial

Essential circuit details, equations and calculations for operational amplifier gain for generic, open and closed loop circuit configurations.

Facts of the day

29 August 2014

History - It was on 29th August 1885 that Gottlieb Daimler patented the world's first motorcycle

Even years ago, some people did not like the telephone. Mark Twain wrote: "It is my heart-warm and world embracing Christmas hope and aspiration for all of us, the high, the low, the poor, the rich, the admired, and the despised, may eventually be gathered in a heaven of everlasting bliss, except the inventor of the telephone!"

Fact - Hedy Lamarr, the Holywood actress was the co-inventor of the frequency hopping technique used in radios and mobile phones to avoid interference and jamming. (see the article on Hedy Lamarr) 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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