News from Rohde & Schwarz
Magazine for test & measurement and radio communication
News from Rohde & Schwarz Issue 1998/III - 159
With PostMan express onto Internet via satellite: SpaceMan DS101
The increasing amount of information flooding data networks such as the Internet is loading wired analog and even digital networks to the limits of their capacity. The consequences are unacceptable waiting times and constraints on realtime applications. By combining shortwave and TV satellite data transmission, the SpaceMan system from Rohde & Schwarz does away with traffic jams on the information highway and in addition provides access to wired networks in areas lacking the necessary infrastructure.
With PostMan express onto Internet via satellite: SpaceMan DS101
New test equipment for type approval of telephones for satellitebased mobile radio system ICO: UT Development Tool TS1232, System Simulator TS1230, Conformance Test System TS8200
It will soon be reality – a satellite-based mobile radio system supporting terrestrial networks so that anyone can be called worldwide with a single mobile phone. The test equipment required for the development, quality control and type approval of these dual-mode phones comes from Rohde & Schwarz.
New test equipment for type approval of telephones for satellitebased mobile radio system ICO: UT Development Tool TS1232, System Simulator TS1230, Conformance Test System TS8200
Convenient generation of complex I/Q signals: I/Q Modulation Generator AMIQ
The number of systems using complex digital modulation has dramatically increased in every field of communications. Usually these elaborate signals are generated with the aid of I/Q modulators. AMIQ is a dual-channel, userprogrammable waveform generator designed throughout for the generation of corresponding baseband signals.
Convenient generation of complex I/Q signals: I/Q Modulation Generator AMIQ
New approaches in calculating complex I/Q signals: I/Q Simulation Software WinIQSIM
The number of modulation methods using I/Q in mobile communication systems has increased rapidly in the past few years. Examples are GSM, now in use worldwide, and the American mobile radio standard NADC. The generation of test signals for these systems is taking more and more time, since just familiarizing with a particular standard can be so time-consuming. With the definition of mobile radio standards of the third generation, the demand for new methods of modulation and channel access is greater than ever.
New approaches in calculating complex I/Q signals: I/Q Simulation Software WinIQSIM
Speech quality of GSM mobile phones improved by precise audio measurement: Audio Analyzer UPL16
Once a yuppie status symbol, the mobile phone has now become an item of everyday use. Even fixed network subscriber lines are being replaced to an increasing extent by mobile phones. As a result, more speech quality is demanded of mobile phones. With its new model from Audio Analyzer family UPL, specially tailored to mobile phone testing in quality assurance and production, Rohde & Schwarz contributes to improving the acoustic quality of future mobile phone generations.
Speech quality of GSM mobile phones improved by precise audio measurement: Audio Analyzer UPL16
Classic VHF sound broadcasting at its very best: Solid-state VHF FM Transmitters SR6..E1
Despite digital audio and video broadcasting, forecasts still anticipate an attractive market ahead for analog FM transmitter technology over the next 15 to 20 years. Rohde & Schwarz responded to these prospects and revised its highly successful, tried and tested generation of solid-state transmitters. The result is even more compact transmitters for an excellent price/performance ratio.
Classic VHF sound broadcasting at its very best: Solid-state VHF FM Transmitters SR6..E1
Freely programmable RF parameter measurements on GSM mobile phones:
Sooner or later every manufacturer of mobiles has to test prototypes for compliance using an internationally recognized type-approval test procedure that comprises both extensive signalling tests and dedicated RF tests. These RF tests include the following...
Freely programmable RF parameter measurements on GSM mobile phones:
STI makes DAB more user-friendly:
Together with other renowned companies, Rohde & Schwarz has implemented a preliminary version of the service transport interface (STI to standard ETS 300 797) as a bidirectional connection in the DAB transmission link between source encoders and ensemble multiplexer. DAB Source Encoders of the new DMU family are optionally equipped with STI, and it can be retrofitted in all existing DAB Ensemble Multiplexers DM001.
STI makes DAB more user-friendly:
Application of DF antennas for Direction Finders
DDF0xS and DDF0xM:
The wide selection of DF antennas available in the ADD family allows tailor-made adaptation of Digital Scanning Direction Finders DDF0xS [1] and Digital Monitoring Direction Finders DDF0xM [2] to any task [3]. These antennas cover the frequency range 0.3 to 3000 MHz and, depending on the type chosen, enable operation as a correlative interferometer or by the Watson-Watt principle (FIG 1).
Application of DF antennas for Direction Finders
DDF0xS and DDF0xM:
MPEG2 transport stream analysis in networked DVB monitoring system using Stream Explorer software:
MPEG2 Measurement Decoder DVMD [1] and the optional Stream Explorer ® [2] software form a test system for comprehensive monitoring and detailed analysis of MPEG2 transport streams. A whole variety of extended functions make the market leader fit for new tasks. The increased networking of DVB transmission equipment calls for network-compatible test systems into which the new Stream Explorer (version 2.00) with all its complex analysis functions can be integrated. In addition, extended measurement functions in both DVMD and Stream Explorer allow insight into the increasingly complex and flexible structures of MPEG2 transport streams.
MPEG2 transport stream analysis in networked DVB monitoring system using Stream Explorer software:
Correct usage of quantities, units and equations (III):
Level is the logarithmic ratio of two power or two field quantities, provided the denominator is a fixed value of a reference quantity of the same dimension as the numerator [8]. Decibel (dB) is again used as the unit. The value of the reference quantity should always be specified when giving numerical values of levels. According to IEC 27-3 [9] the reference quantity in parentheses can follow the dB symbol to obtain an abbreviated form. If the numerical value of the reference quantity equals ...
Correct usage of quantities, units and equations (III):
Antenna System AK610 for HF radiomonitoring:
All the components required in a radio receiving system have to be optimized to produce the best possible design. And a very important part of this process is selection of the right antenna. In the HF range in particular, a lot of importance attaches to matching the antenna – especially its vertical radiation patterns – to the reception task. Signals with high-angle radiation as well as those with a low angle of incidence need to be received, and both short and global distances have to be covered without a gap.
Antenna System AK610 for HF radiomonitoring:
ACCESSNET® Trunked Radio System for Oman Aviation Services:
At the beginning of the 70s, Muscat, capital of the Sultanate of Oman, had only a simple airstrip lying in a plain in a rough and rocky mountainous area. Flight operations were handled in the simplest possible way from a small terminal building. In the past 25 years this airstrip has undergone continuous modernization and expansion to become today’s Seeb International Airport (FIG 1), which with about three million passengers per year is now among the most efficient and advanced ...
ACCESSNET® Trunked Radio System for Oman Aviation Services:
VOR-ILS analyzer for air traffic control:
Rohde & Schwarz Cologne Plant developed VOR-ILS Analyzer EVS200 for the inspection and maintenance of modern air traffic control systems especially for DFS (German air traffic control) in Offenbach and has already supplied 36 units. Among other things DFS is responsible for the proper functioning of instrument landing systems (ILS) at 17 German civil airports and of VHF omnidirectional radio beacons (VOR).
VOR-ILS analyzer for air traffic control:
Spectrum Analyzer R3131, an allrounder for the small budget:
Model R3131 from Advantest is a spectrum analyzer representing a new generation. This instrument, marketed by Rohde & Schwarz, offers versatile applications in manual operation as well as in system use and all that for unbeatable price/performance. With its clear-cut user interface, compact size, weight of only 12 kg and attractive price, R3131 is an obvious choice as a personal analyzer for every workplace in design and service, besides being an ideal, budget-priced tool for raining purposes.
Spectrum Analyzer R3131, an allrounder for the small budget:
HF Transceivers XK2000: new functions and features
HF Transceiver Family XK2000 [1; 2] is now offering a large variety of new features. For operators of systems already supplied the good news is that in most cases only a software update or minor hardware modifications are necessary. In addition to an attractive, improved man-machine interface the user will especially appreciate the new applications in naval communications.
HF Transceivers XK2000: new functions and features
PostMan on tour: In its PostMan software package [1] Rohde & Schwarz has created a unique, so far unmatched product that opens up new avenues in message handling. PostMan has been introduced to a wide public at many presentations and live demonstrations all over the world. Featuring international standard interfaces and TCP/IP protocol transmission, PostMan can be integrated into any existing communication systems and applications.
PostMan on tour: In its PostMan software package [1] Rohde & Schwarz has created a unique, so far unmatched product that opens up new avenues in message handling. PostMan has been introduced to a wide public at many presentations and live demonstrations all over the world. Featuring international standard interfaces and TCP/IP protocol transmission, PostMan can be integrated into any existing communication systems and applications.
Another step to becoming a global player: Rohde & Schwarz Support Centre Asia
Business in Asia has been very good in recent years, and Rohde & Schwarz has now taken an important step towards emphasizing its presence on one of the fastest growing telecommunications markets by establishing the Rohde & Schwarz Support Centre Asia (SCA) as a private limited company.
Another step to becoming a global player: Rohde & Schwarz Support Centre Asia
R&S France demonstrates automatic production test line:
In March this year Rohde & Schwarz France organized in Meudon-la-Foręt a project day on the subject of “automated measurements in production” to demonstrate its know-how in this field. Invited guests were able to experience an automatic test line in action (photo). At the same time videos of various systems already in operation at key customers were shown in an adjacent hall. The test line presented was to be just an example. Rohde & Schwarz France’s specialty is being able to offer global solutions while at the same time taking into account a customer’s specific testing needs. As to the type of products tested, it is obvious that the demodulator of a TV set needs a different approach than a component for a radiotelephone or a consumer electronics product. Although the goal is always the same, ie the best possible quality, the means of achieving it are different. Rohde & Schwarz has a large variety of instruments and systems allowing measurements to be performed in areas as different as in-circuit and ...
R&S France demonstrates automatic production test line:
Precise measurement of adjacent-channel power on wideband CDMA signals:
For measuring suppression of the power radiated in adjacent channels with W-CDMA (wideband code division multiple access) signals, instruments must have sufficient margin relative to the tolerance limits laid down in specifications. This requirement becomes even more stringent for a spectrum analyzer used to measure the ACPR (adjacent-channel power ratio) on modules and components in the transmission path of W-CDMA base stations. Spectrum Analyzer FSE with its wide dynamic range is the ideal choice for this application. The attainable ACPR value is limited by the inherent noise floor of the spectrum analyzer and the increase of nonlinear distortion products. For this reason the level at the mixer has to be set very carefully. Use of RF Attenuator RSG...
Precise measurement of adjacent-channel power on wideband CDMA signals:
Focus on service: Mitsubishi Electric Europe B.V. opens new EMC competence center
Mitsubishi Electric Europe B.V., whose German subsidiary opened its new EMC competence center in Ratingen in April 1998, intends to offer economical and extremely fast EMC certifications also for customers other than Mitsubishi. The new center consists of a test lab that is accredited for all areas of electronics and as its main task checks compliance with RFI limits for CE label award, as well as of a unit that assesses the environmental electromagnetic compatibility of equipment and systems. The new EMC competence center not only works for the Mitsubishi group, it is also available to all other manufacturers of electrical and electronic goods and offers a wide range of services such as preconformance consultation during design and EMC planning.
Focus on service: Mitsubishi Electric Europe B.V. opens new EMC competence center
International measurement program: Spectral occupancy at high frequency in Europe
The HF spectrum (3 MHz to 30 MHz) is capable of long-range communication with modest transmitter powers by the ionospheric reflection of low-angle sky waves. It is also used for short-range communication by ground wave or by the ionospheric reflection of high-angle sky waves, the latter technique being important in mountainous or forest terrain. Examples of HF users are international broadcasters, land-based fixed and mobile, maritime mobile and aeromobile operators. To enable organized use of the spectrum, the International Telecommunication Union defines a number of frequency allocations across the spectrum for each type of user.
International measurement program: Spectral occupancy at high frequency in Europe
ROHDE & SCHWARZ GmbH & Co. KG
Muehldorfstrasse 15, 81671 Munich, Germany
Phone: +49 89 41 29 - 0
Fax: +49 89 41 29 12 164
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Internet: http://www.rohde-schwarz.com/
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