News from Rohde & Schwarz
Magazine for test & measurement and radio communication
News from Rohde & Schwarz Issue 1998/IV - 160
The ideal analyzer for the third mobile-radio generation: Signal Analyzer FSIQ
The decision to implement digital wideband CDMA for the third generation of mobile radio – following analog FM and GSM – represents a milestone not only in transmission technology but also in the related measurement technology because of the larger bandwidth available for transmitting data and graphics. The FSIQ signal analyzer family was developed specially for examining the physical parameters of wideband CDMA signals, besides supporting the measurements used for previous transmission modes.
The ideal analyzer for the third mobile-radio generation: Signal Analyzer FSIQ
Test signals for digital WorldSpace satellite sound broadcasting: Vector Signal Generator SMIQ02W / SMIQ03W
WorldSpace of Washington is currently setting up a digital satellite system to provide a wide range of programs to countries with inadequate broadcasting infrastructure. The planned, portable sound receivers have a built-in patch antenna for direct satellite reception. Rohde & Schwarz supplies the test equipment for use in the production of such receivers.
Test signals for digital WorldSpace satellite sound broadcasting: Vector Signal Generator SMIQ02W / SMIQ03W
Fast switching by network: Antenna Switch Matrix NVX
The increasing scale of automation in radiomonitoring makes special demands on the RF parameters and switching speeds of today’s antenna switch matrixes. Custom configurations are also a necessity. Antenna Switch Matrix NVX meets these requirements thanks to modular design and a flexible control system based on the optical Ethernet.
Fast switching by network: Antenna Switch Matrix NVX
New transmitters for TV band III: Solid-State VHF TV Transmitters NM500
In the NM500 family, Rohde & Schwarz is introducing a new series of solid-state MOSFET transmitters for band III. Output power of 5 to 20 kW can be achieved simply and cost-effectively by cascading several units.
New transmitters for TV band III: Solid-State VHF TV Transmitters NM500
Enormous capability wrapped up small: Spectrum Analyzer U3661
New in the ULIS family of spectrum analyzers from Advantest is U3661, the world’s first portable, battery-operable microwave spectrum analyzer in synthesizer technology.
Enormous capability wrapped up small: Spectrum Analyzer U3661
Allrounder for radiomonitoring up to 3 GHz: Receiving Antenna System AU900A4
The capabilities of state-of-the-art receivers can only be fully utilized if an equally high-grade antenna optimizes the interface where the electromagnetic wave is brought in. Otherwise signal quality will be lost that cannot be regained anywhere in the receiving system. Compact Antenna System AU900A4 from Rohde & Schwarz is the ideal transducer for the different wavelengths throughout the frequency range 10 kHz to 3 GHz.
Allrounder for radiomonitoring up to 3 GHz: Receiving Antenna System AU900A4
ACP measurements for W-CDMA using Signal Generator SMIQ and Low ACP option:
The new mobile-radio generation based on W-CDMA (wideband codedivision multiple access) is aiming at high transmission quality together with high availability and economy. This is to be guaranteed by specifications like the one relating to adjacent-channel power (ACP), which will ensure unimpaired communication in adjacent frequency channels. In the special case of W-CDMA this specification makes very high demands on the measurement technology. Rohde & Schwarz’s response to this was to develop Low ACP option SMIQB46 for Signal Generator SMIQ.
ACP measurements for W-CDMA using Signal Generator SMIQ and Low ACP option:
Application software: making measurements easier
Many a measurement is simpler and faster with the help of a computer. Rohde & Schwarz has developed a number of programs to support a wide variety of measurements. The software – obtainable with application notes – runs under Windows 3.1, Windows 95 and Windows NT 4.
Application software: making measurements easier
TDMA direction finding with Digital VHF/UHF Monitoring Direction Finder DDF05M:
Scarcity of frequencies means that TDMA (time-division multiple access) is being used to an increasing extent. The GSM standard for mobile phones is a classic example. User information for eight subscribers is alternately transmitted in bursts (timeslots C0 to C7) with a duration of 577 µs in a frequency channel 200 kHz wide (FIG 1). TDMA is also due to be introduced for the VHF digital link (VDL) in air-traffic control (118 to 137 MHz), starting up ...
TDMA direction finding with Digital VHF/UHF Monitoring Direction Finder DDF05M:
Mobile interference measurement in GSM networks:
One of the accompaniments of constantly expanding GSM mobile networks is the occurrence of local interference pockets where signal carriers of different mobile cells superimpose on each other. Traffic capacity is then reduced and in the worst case, when no alternative channel is available, a call is disconnected. Specialists localize these pockets, identify the interference and its source and eliminate the cause through antenna adjustment, power adaptation or skilful reassignment of frequency resources.
Mobile interference measurement in GSM networks:
Probability of intercept for frequency hop signals using search receivers (I):
This article is not only intended to brush up the reader’s knowledge on the subject but also presents latest scientific findings. The probability of intercept for bursts and frequency hop signals by means of search receivers or scanning direction finders is calculated on a general basis and with particular attention to multichannel receivers and overlapping search and hop frequency ranges. The article also deals in detail with the timing of the receiver sequence coinciding with the hopper sequence*. For the sake of simplicity, ideal conditions are assumed.
Probability of intercept for frequency hop signals using search receivers (I):
Virtual networks: new applications for Network Analyzers ZVR and ZVC:
Virtual Embedding Networks option ZVR-K9 is a new tool that opens up a whole variety of new applications for Network Analyzers ZVR and ZVC [1]. This software allows so-called virtual networks to be taken into account in S-parameter measurements.
Virtual networks: new applications for Network Analyzers ZVR and ZVC:
Controlling radio transceivers on Intranet:
As the PC made inroads into just about every aspect of daily life, its use for controlling equipment was obviously only a matter of time. Equipment control by PC is subject to constant change, as it is linked to what is happening in computer engineering. The latest development in radio control from Rohde & Schwarz – Radio Remote Control Software DS110 (RRC software) – makes use of the most advanced technologies to be found in computer networks today and its concept sets standards for future developments. The software incorporates a wide variety of tools, Java-based web browsers and relational database management systems as well as client/server architectures.
Controlling radio transceivers on Intranet:
HF Airborne Radio XK516D1 well on course:
Transceiver XK516D1 – an HF airborne radio for use in passenger and cargo aircraft – has proven to be a great success worldwide, which can be attributed among other things to its capability to transmit and receive both speech and data.
HF Airborne Radio XK516D1 well on course:
EMC test center of SEE in Luxembourg:
The EMC test center of SEE (Service de l’Energie de l’Etat) in Capellen, Luxembourg, has been operational for more than one year now. A wide variety of products are tested here and certified for compliance with the European EMC directive. The center was implemented in close cooperation with Rohde & Schwarz, which was responsible for turnkey delivery and project management. An anechoic chamber (FIG 1) is used for testing radiated emission and immunity of equipment. The chamber’s shielding is specified for frequencies up ...
EMC test center of SEE in Luxembourg:
Industrial Controllers PSM12 / 17 – the next generation:
When it comes to professional measurements, the controller should not be the weakest link in the chain but rather be able to meet special requirements. These may include shock and vibration resistance, especially for use in vehicles or industrial environments, ultra-low temperature effect, high immunity to interference even in strong electromagnetic fields as well as low inherent emission so that measurements will not be impaired by fields produced by the controller. PSM offers ideal characteristics for all key applications, shock resistance in mobile applications, rackability, built-in measurement facilities for use in production and high EMI shielding.
Industrial Controllers PSM12 / 17 – the next generation:
New test van for Bayerischer Rundfunk:
The transmitter operations department of the Bavarian broadcaster Bayerischer Rundfunk (BR) runs a mobile test laboratory for supervision of its transmitter facilities. The measurements performed throughout the broadcasting area (14 main network transmitters and 343 TV transposers) are required for rebuilding, modifying or renovating ...
New test van for Bayerischer Rundfunk:
EMC test system for MTU Munich of Daimler-Benz Aerospace:
An EMC test system from Rohde & Schwarz has gone into operation for BCI (bulk current injection) tests at Motoren- und Turbinen-Union (MTU) in Munich. The company is now able to carry out its own EMC tests on engine control systems, test equipment for control systems and ground handling equipment throughout the development phase as well as perform type-certification tests. The system allows tests to various regulations such as EFA standard SPE-J-000-E-1000, CS-EFA2, MIL-STD-461D, CS114, ISO 11452-4 and can be extended for other test procedures.
EMC test system for MTU Munich of Daimler-Benz Aerospace:
W-CDMA, T&M technology for third-generation mobile radio:
The next mobile-radio generation will present possibilities far beyond those presently available. With today’s so-called second-generation units we can telephone and, with certain restrictions, send brief messages and faxes, but the third generation has to enable far greater access to information. Requirements range from Intranet or Internet links through multimedia to video on demand...
W-CDMA, T&M technology for third-generation mobile radio:
Accurate data-rate measurement in digital video broadcasting: Test Hint
Data transmission rate has to be measured frequently in digital television, independently of an MPEG2 Measurement Decoder DVMD and directly after DVB modulation. Direct measurement of the symbol rate is not always accurate enough, even if it is determined with accuracy of 1 kHz as with TV Test Receiver EFA. Seen in relation to the data rates of 38.153 Mbit/s and 64 QAM (DVB-C) common in today’s cable systems, 1 kHz resolution is equivalent to an error of ...
Accurate data-rate measurement in digital video broadcasting: Test Hint
E-mail via shortwave into Internet: state of the art in HF communications
The good old shortwave radio set has been perfected in several ways. Information data rates of a few uncertain tens of bits per second were increased to more than 3000 errorfree bit/s by sophisticated modem techniques and error correction. Intelligent algorithms were created to adapt transmission parameters to channel quality or initiate a change to a better channel. System-oriented considerations turned a unit for transmitting Morse into a LAN/WAN-compatible communications system permitting all kinds of data to be exchanged. FIG 1 shows a modern workstation based on Rohde & Schwarz’s HF Transceiver XK2000.
E-mail via shortwave into Internet: state of the art in HF communications
ROHDE & SCHWARZ GmbH & Co. KG
Muehldorfstrasse 15, 81671 Munich, Germany
Phone: +49 89 41 29 - 0
Fax: +49 89 41 29 12 164
e-Mail: CustomerSupport@rohde-schwarz.com
Internet: http://www.rohde-schwarz.com/
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