Test & Measurement

Remote analyser enables 24/7 outdoor monitoring

22nd January 2021
Mick Elliott

The new Real Time Outdoor Remote Analyser is the latest addition to Narda Safety Test Solutions SignalShark family. Following on from the Handheld Analyser and the Remote Unit, it closes the last remaining gap in applications.

The rugged, remote-controlled signal analyser brings the necessary performance to monitor tasks requiring 24/7 operation outdoors.

This includes in the open air, mounted at height on an antenna tower, in the freezing cold or scorching heat, open to all weathers and completely on its own.

High up where there is the best view for locating interference but there is usually not much infrastructure, is where the new unit excels.

Under inhospitable conditions, it detects and analyses, classifies, and localizes RF signals between 8 kHz and 8 GHz and is the equal of its two siblings.

With its real time bandwidth of 40 MHz, even the briefest and most infrequent signal events will not escape.

The new Outdoor Unit operates in the open air with the same precision and reliability for which the German RF test and measurement specialist has become renowned in this field for the past more than 20 years.

The instrument is specially constructed to allow it to operate without problems within a robust, weatherproof, diecast aluminum housing that also acts as a heatsink, without any openings for ventilation being needed.

This means that the instrument is hermetically sealed to comply with protection class IP65, while still allowing the heat produced by the real time analyzer and integrated Windows 10 computer to be dissipated effectively. Its operating temperature range is stated as -20 to 55 °C.

Narda is aiming the new Outdoor Unit of the SignalShark at all professions and users that are tasked with long term monitoring under open air conditions. This includes various authorities, including system integrators for civil and military system solutions, border protection, and the police.

Since all three SignalShark units use the identical GUI, users only have to learn how to use one device to be able to use any of the different units for all kinds of applications without any problems.

For example, a police officer who detects a mobile interferer can simply switch from the SignalShark Outdoor Unit to the Handheld device and use this on the ground together with the ADFA automatic direction-finding antenna to track down and apprehend the culprit either on foot or in the patrol car.

The new Real Time Outdoor Remote Analyzer is also suitable for the latest monitoring tasks, for example, to ensure that the frequency ranges being used for the rollout of 5G services are clean, that is, free of interference or unoccupied.

These frequencies in particular need specific and permanent monitoring because they have to some extent only recently been officially released or they may be located immediately adjacent to terrestrial broadcasters such as TV transmitters.

The latter pose a not inconsiderable threat of interference at frequencies around the 700 MHz mark. The Outdoor Unit is also very compact, weighing just 13 kg, which is a considerable advantage that makes the test engineer’s job easy when it comes to mounting it in its most usual location, high up on a tower where it has a clear “view” all round.

As with the other devices in the SignalShark range, the Outdoor Unit is also designed as an open platform. This means that it too communicates using standardised languages and uses and supports common formats that are customarily used by the scientific community.

The range of expansion modules includes non-Narda third party products.

It means additional applications from other manufacturers can be run on this Windows10-based instrument with its Intel quad-core processor, e.g. for classifying digitally modulated signals. Integration into any software environment is possible thanks to a well-documented SCPI command sequence and VITA 49 compliant I/Q data streaming.

Apart from the LTE antenna in the Modem version, the device does not have a built in or fixed antenna. This means that the antenna can be freely selected according to the application. The Outdoor Unit is equipped with three switchable RF connections to allow connection of three different antennas for different frequency ranges or to cover different directions.

If it is used in conjunction with the Narda automatic direction-finding antenna ADFA, for example, interference in the spectrum can be traced and its direction found straight away.

Even if the Outdoor Unit is “only” used with an off the shelf omnidirectional antenna, it is still possible to localize a signal. This is because the unit supports both automatic direction-finding and TDOA. TDOA software can determine the precise location from where a signal is transmitted by calculating the time when the signal was received by which antenna in a TDO network of at least three units.

Narda offers two versions of the new SignalShark model: The PoE (Power over Ethernet) Outdoor Unit uses a single Ethernet cable for data communication and to provide its power supply as well as the supply for the automatic antenna. This simplifies connection to a building.

The Modem version for stand-alone operation uses a DC supply, possibly from a solar panel, and includes a built in LTE modem for data transfer and remote control. This means that the device is 100% autonomous when there is a mobile network available during daylight. At night, the Outdoor Unit draws reliable power from the inbuilt rechargeable batteries that are charged up during the day.

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