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Portable node B analysis

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Anritsu has introduced the MT8220A UMTS Master, a portable handheld Node B analyser that the company says brings the size, performance and cost advantages of its Spectrum Master to 3G/UMTS applications. Covering the UMTS ranges of 824 to 894 MHz and 1710 to 2170 MHz, as well 2300 to 2700 MHz, the MT8220A can conduct both RF and demodulated measurements.

In addition, it functions as a spectrum analyser with continuous frequency coverage up to 7.1 GHz, with Displayed Average Noise Level (DANL) of typically –153 dBm at 1 GHz.

The company says the MT8220A is suited for use by 3G/UMTS service providers, contractors and installers who install and maintain UMTS/W-CDMA Node B equipment.

Accurate RF measurements

The MT8220A can be used in the field to conduct all necessary UMTS/W-CDMA RF measurements. The company says a self-calibrating RF front-end and a precision frequency reference ensure that RF measurements are accurate. RF measurements that can be made with the MT8220A include adjacent channel leakage power, occupied bandwidth and a spectral emission mask for analysing a base station’s output.

For demodulation measurements, the MT8220A has a code domain power display that can display all 512 Orthogonal Variable Spreading Factor (OVSF) codes in the UMTS/W-CDMA signal relative to total power or pilot power. There is also a codogram display that identifies code power variations over time and traffic activity over time. The MT8220A measures Error Vector Magnitude (EVM) with a resolution of 0.1 percent, for highly accurate determination of a transmitter’s modulation quality.

The MT8220A has an Over-the-Air (OTA) option that allows technicians to perform measurements while staying in their trucks. The OTA measurement can detect the six strongest scrambling codes, and display them in both graphical and table formats.

An eye on H&S

Recognising the increased concern for health and safety, the company has designed the MT8220A to support the European ECC (02) 04 recommendation for measuring non-ionising electromagnetic radiation providing a new concept in EMI testing. Anritsu partnered with Antenessa, a provider of technologies that assess systems for human exposure to electromagnetic fields, to develop custom software that plots data from both GSM channel power and UMTS/W-CDMA Power in the Common Pilot Channel (CPICH) measurements for EMI analysis.

Because the MT8220A is built on the Spectrum MasterTM platform, the company says it is lightweight and durable. Its large 21.5-cm, daylight-viewable TFT display makes it easier to see measurement results. In addition to eight standard languages, two user-defined custom languages can be installed in the MT8220A. For downloading data, the MT8220A features compact Flash, USB 2.0 and Ethernet 10/100 interfaces.

Broadband cable and antenna analysers

Anritsu has also introduced the Broadband Site Master S810D/S820D series cable and antenna analysers. The company claims these units provide the “widest frequency bandwidth of any handheld instrument, allowing for the precise detection of faults in cables and antennas used in wireless backhaul and defence/aerospace applications”. The models cover the frequency range 25 MHz to 20 GHz (model S820D) and provide increased frequency coverage, performance and functionality in a portable instrument.

For microwave frequencies, the S810D/S820D combine vector error correction and waveguide dispersion corrections, for a claimed portable distance-to-fault (DTF) accuracy of ±1 cm in both coaxial and waveguide media. When time is critical, the S810D/S820D can find connector transitions, jumpers, kinks and degradation of antenna systems where benchtop instruments are not practical.

The S810D/S820D offer standard return loss, VSWR, cable loss and DTF displays for installing, maintaining and trouble-shooting cables and antennas. In addition, an optional GPS receiver is available for providing location information with archived data. An optional Power Monitor feature enables the measurement of transmitters and long cables, when the analysers are configured with an external synthesiser.

With increased measurement speed and faster DTF calculation capability, the S810D/S820D allow measurements to be updated and displayed in real time. The S810D/S820D also features the company’s patented RF interference rejection to ensure accurate and repeatable measurements, even in the presence of high RF activity.

A data management and analysis software suite, dubbed Handheld Software Tools, is standard with the S810D/S820D. Handheld Software Tools provides users with a method of managing, archiving and analysing system performance, trends and the general system condition. With the software, users can store field-acquired cable and antenna plots for downloading to any Windows-based PC. This allows current test data to be analysed and compared to historical performance data.

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