News from Rohde & Schwarz
Magazine for test & measurement and radio communication
News from Rohde & Schwarz Issue 1999/I - 161
TV via antenna: digitally fit: TV Test Transmitter SFQ Model 20
TV Test Transmitter SFQ is the solution for testing all digital TV receivers in development, production, quality assurance and service. Its speciality is that it can work as a test transmitter for established standards and adapt very fast to any newly introduced ones. The new SFQ model 20 is suitable for all measurement tasks of terrestrial TV in line with DVB-T standard.
TV via antenna: digitally fit: TV Test Transmitter SFQ Model 20
Type-approval tests of TETRA mobile radios: TETRA Protocol Test System TS1240
During the past year, TETRA has been firmly establishing itself to take over from the analog MPT1327 standard in wireless communication. About 25 projects are presently running in Europe and overseas. Any application based on analog systems is a potential market for TETRA. To ensure reliable communication – particularly for police, fire brigades and emergency services – not only RF parameters but also signalling procedures have to be tested in type approval of the transceivers, and this is where TETRA Protocol Test System TS1240 comes in.
Type-approval tests of TETRA mobile radios: TETRA Protocol Test System TS1240
CDMA, AMPS and IS136 measurements with one unit: Digital Radiocommunication Tester CMD80
The successful Digital Radiocommunication Tester CMD80 has evolved into a multimode mobile radio tester: It now masters D-AMPS according to IS136 along with CDMA and AMPS, making it an indispensable tool in the development, production and service of mobile radio equipment worldwide.
CDMA, AMPS and IS136 measurements with one unit: Digital Radiocommunication Tester CMD80
Test platform for HSCSD and multicarrier applications: Digital Radiocommunication Test Set CRTx-DUO
Mobile radio manufacturers frequently have to perform critical four-channel handover or cell selection/reselection tests during the development of a new model. They also require measurement equipment for testing new data services such as high-speed circuit-switched data (HSCSD) and general packet radio services (GPRS), which make use of more than one active timeslot at a time. CRTx-DUO, a combination of two Radio Test Sets CRTS, CRTP or CRTC, which can be operated as stand-alones again at any time, is a fully fledged four-channel tester ideal for these testing scenarios.
Test platform for HSCSD and multicarrier applications: Digital Radiocommunication Test Set CRTx-DUO
PC, teletype and radio team up:
Even though the combination of radio and teletype (RATT) is generally no longer regarded as a modern means of information exchange, it is often the only available basis for data transmission due to its widespread use. Whether onboard a ship or in an embassy, teletype is still frequently used for sending text messages by radio. Texts are normally written in the internationally defined format ACP-127 (allied communication protocol). For transmission, the individual teletype characters are converted to 5-bit Baudot code. FSK (frequency-shift keying) is used to modulate the radio link. With data transmission rates between 50 and 600 baud, FSK may be comparatively slow but it is very resistant to interference.
PC, teletype and radio team up:
Fit for the next millennium: W-CDMA signals
with Signal Generator SMIQ and Software WinIQSIM
There are two ways of upgrading Signal Generator SMIQ [1] to a source for W-CDMA (wideband code division multiple access) signals. One way involves using Modulation Generator AMIQ [2] to provide the necessary W-CDMA baseband signals for SMIQ. In this case the unit is operated via a convenient menu in Software WinIQSIM [3]. The other way is through W-CDMA option SMIQB43, which is now available and makes SMIQ a stand-alone W-CDMA source. The well-proven options Data Generator SMIQB10 and Modulation Coder SMIQB11 are used to generate the baseband signals.
Fit for the next millennium: W-CDMA signals
with Signal Generator SMIQ and Software WinIQSIM
Secure communication with ComSaveBox:
Serial links are widely used to transmit information. The data are usually transmitted via modems and public telephone networks. But anyone can access these routes, so there are threats to confidentiality and integrity of data. Data can be intercepted, manipulated or retained, for example, without the sender or recipient noticing. Consequently sensitive data have to be suitably protected against such threats. The most efficient method is the use of cryptography, ie transformation of data so that no conclusions can be drawn about their contents. Furthermore, there are special mechanisms to protect transmitted information against unnoticed manipulation.
Secure communication with ComSaveBox:
Use of R&S components for Inmarsat-E signal generation at navtec:
A new worldwide standard for transmitting and evaluating distress calls from ships and aircraft, Inmarsat-E, has established itself in the last few years. It is a system operating in conjunction with the four geostationary Inmarsat satellites. The standard was developed and formulated with the objective of ensuring reliable and unrestricted transmission of distress calls within the shortest possible time and for a large number of users. In contrast to LEO (low earth orbit) satellites, which can be received at a specific position on the earth only for a short time once every one to two hours, geostationary satellites guarantee reception and evaluation...
Use of R&S components for Inmarsat-E signal generation at navtec:
Use of Measurement Decoder DVMD
for quality control by Swiss broadcaster:
Broadcasters are increasingly turning to digital technology for better management of resources and the spectrum. When a broadcaster today decides in favour of satellite transmission, this will be in line with DVB and MPEG2 standards – at least in Europe. This means that the signal must be conditioned, compressed and multiplexed before it can be modulated and sent to...
Use of Measurement Decoder DVMD
for quality control by Swiss broadcaster:
High-power and multicarrier tests with Base-Station Test System TS8510:
TS8510 was designed by Rohde & Schwarz for manufacturers of GSM mobile-radio base stations and enables complex testing including type approval [1; 2]. Type-approval tests are the prerequisite for setting up new base stations in networks and are performed in compliance with BAPT 222 ZV 6 (Germany) and MPT 1378 (Britain) on the basis of GSM specifications 11.21and 11.23. They also extend to high-power base stations operating...
High-power and multicarrier tests with Base-Station Test System TS8510:
Portable, mobile or stationary radiomonitoring: Rohde & Schwarz has the ideal receiver every time
The selection of radiomonitoring receivers from Rohde & Schwarz satisfies practically all requirements for the detection, localization and display of signals in the frequency range 10 kHz to 3 GHz.
Portable, mobile or stationary radiomonitoring: Rohde & Schwarz has the ideal receiver every time
New functions added to Abis control software
for Radiocommunication Testers CMD54/57:
Digital Radiocommunication Testers CMD54/57 [1; 2] are tried and proven instruments for testing base stations (BTS) in production, installation and service. They can control base stations and measure their RF interfaces with the optional Abis interface and Abis control software, CMD assuming essential tasks of the base station controller (BSC). The Abis interface between the BSC and a BTS operates at a data transfer rate of 2.048 Mbit/s or 1.544 Mbit/s. The Abis protocol handles the exchange of data and signalling information between CMD and a BTS.
New functions added to Abis control software
for Radiocommunication Testers CMD54/57:
Probability of intercept for frequency hop signals using search receivers (II):
Given that the hopper’s frequency spacing is known from searching the frequency range, a receiver can be fixed tuned to one of the hop channels. The FH transmitter is then detected when its instantaneous frequency coincides with the set receive frequency. For a hop to be detectable its duration must be Th > Ti. In wait mode (hopper trap) the time required for synthesizer setting and signal processing does not influence probability of intercept, so Td = Ti applies in this case.
Probability of intercept for frequency hop signals using search receivers (II):
Mobile power measurement with NRT sensor and PC Card Adapter NRT-Z4:
Directional Power Meter NRT for power and reflection measurements on digital mobile-radio base stations has been a big success in its first two years on the market*. The sensors NRT-Z43 and NRT-Z44 have digital interfaces, which enable them to be used without the basic unit, ie directly at the serial interface of a PC, laptop or notebook. Previously this was made possible by Interface Adapter NRT-Z3 in combination with the graphical Windows user interface NRT-V. What makes the standalone solution so attractive for users working in R&D, production, service and installation is not only the possibility of immediate processing of measured results on a PC but also the favourable...
Mobile power measurement with NRT sensor and PC Card Adapter NRT-Z4:
CECOM tests products from Rohde & Schwarz:
In Ft. Monmouth, New Jersey, Rohde & Schwarz presented its radiocommunication products to the United States Army Communications Electronics Command (CECOM). This took place within the strategic objective to extend and secure the market for Rohde & Schwarz products in the US. The standards set by this central test and procurement authority for defense material (FIG 1) are extremely high: the products selected and purchased there definitely have quality and name.
CECOM tests products from Rohde & Schwarz:
Simulation of channel noise and nonlinear
amplifier distortion with Signal Generator SMIQ:
A state-of- the-art signal generator should not only be capable of delivering ideal signals with diverse types of modulation but also of simulating signal impairments of the kind encountered in practice. The impairments can originate from nonlinear transmitter stages, interference on the radio link or noisy receiver input stages.
Simulation of channel noise and nonlinear
amplifier distortion with Signal Generator SMIQ:
ACS100 test systems for calibration of
R&S test and measurement equipment worldwide:
Rohde & Schwarz produces and markets T&M equipment and systems of the highest quality and accuracy. Naturally, top-class equipment too needs to undergo regular tests for compliance with the accuracy specified in its data sheet. Speed of calibration is particularly important for equipment used on production lines, because ongoing production must not be impeded. For this reason, calibration has to fulfill the following requirements...
ACS100 test systems for calibration of
R&S test and measurement equipment worldwide:
Determination of bit error ratio in DVB: Test Hint
The following questions are salient when assessing the quality of a DVB (digital video broadcasting) system: How high is the available margin of a DVB transmission? Up to what C/N ratio can a settop box still demodulate and decode DVB signals? The answers are obtained through deliberate deterioration of the C/N ratio by superimposing white noise on the DVB signal. Appropriate conversion produces the bit error ratio (BER) as a function of the C/N ratio for QPSK modulation and all QAM modes.
Determination of bit error ratio in DVB: Test Hint
Determination of cable length and/or jitter margin of data transmission paths:
In the transmission of serial digital data signals such as video signals it may well be that the data signal received is errorfree although it is strongly disturbed. However, above a certain threshold even a slight increase of interference may cause complete transmission breakdown.
Determination of cable length and/or jitter margin of data transmission paths:
Picture quality measurements for digital TV:
At last a way of measuring the quality of television! There is surely no viewer who would not appreciate it. But to allay great hopes – or even fears – it is not the quality of the contents of TV programs that is meant. This will remain the subjective judgement of the viewer. Here quality means the quality of the picture itself, the requirements and methods of measuring it, the associated problems and newly emerging solutions.
Picture quality measurements for digital TV:
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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