Link Microtek is now stocking the new Nardalert S3 RF radiation monitor from Narda Safety Test Solutions.

Featuring an innovative design with removable sensor module, the S3 unit allows rapid support in the field, simplifies calibration logistics and offers a simple means of implementing future upgrades. These are significant benefits for organisations such as broadcast and telecoms companies, which typically operate a large number of monitors to protect personnel working in the vicinity of high-power transmitters.

The frequency response of the sensor module is shaped to match the requirements of the ICNIRP international standard. Should the monitor detect electric field strengths that approach or exceed the specified exposure limit, it will generate visual, audible and vibration alarms to alert the user. The unit’s two alarm thresholds are preset to 50 percent and 200 percent of exposure limit but can be altered to other values if required.

The Nardalert S3 also features a top-mounted colour display, which shows battery status, sensor information and the frequency band of any detected fields.

For more advanced applications, an S3 ‘Optioned’ model provides additional functionality such as storage and display of exposure history and transfer of recorded data via USB or fibre-optic links.

Designed to be worn on the body or used as a fixed area monitor, the Nardalert S3 is housed in a rugged plastic casing measuring just 117.1 x
82.6 x 31.8mm and weighing only 230g with sensor attached.

It is powered by an RCR123A rechargeable lithium-ion battery, which provides approximately 25 hours of operation and can be charged either via a computer’s USB port or using the universal charger supplied.

Each monitor also comes with belt clip, lanyard clip, silicone rubber skin for additional shock protection, USB cable, software, operating manual, calibration certificate and carrying case. Optional accessories include fibre-optic cables and converters, as well as a mounting bracket to facilitate area monitoring.

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Amesys Products from Link Microtek

Link Microtek, the specialist supplier of microwave and RF components and systems, has been appointed as UK representative for French defence-systems manufacturer, Amesys.

Based in Aix-en-Provence, Amesys offers a comprehensive range of non-ITAR equipment for signal intelligence applications in the defence and security fields.

Commenting on the appointment, Link Microtek’s managing director, Steve Cranstone, said: “Link Microtek is already well established as a supplier of components and subsystems to the defence sector, and this new agreement will enable us to move up a level to offer a range of complete systems to UK military and government customers.”

The Amesys product portfolio includes instruments for the interception, demodulation, decoding, recording and analysis of signals, as well as a variety of jamming systems, radar simulation systems, ruggedised computers and missile launch systems.

Olivier Bohbot, managing director of Amesys’s sales arm, Elexo, believes that Link’s expertise will be invaluable: “Link Microtek has many years of experience in microwave and RF defence electronics, and we are confident that this agreement marks the beginning of a very successful partnership.”

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New isotropic E-H field analyser provides accurate measurements at LW, MW and SW transmitter sites

Now available from Link Microtek, the leading UK supplier of RF radiation safety systems, is an innovative field analyser designed to provide accurate isotropic measurements of both electric and magnetic fields in the vicinity of long-, medium- and short-wave broadcast transmitters.

Manufactured by Narda Safety Test Solutions, the EHP-200 includes built-in spectrum analysis capability over the frequency range 9kHz to 30MHz and accommodates all the field sensors and measurement circuitry in a robust housing only 92 x 92 x 109mm in size.Using a rugged optical-fibre link, the field analyser displays results in real time either on a PC or on the optional 8053-Display unit. The EHP-200 can handle a wide range of field levels from 0.02 to 1000 V/m and 0.6 mA/m to 300 A/m, and it features a frequency resolution down to 1kHz for detailed measurements. Dynamic range is greater than 80dB.

All measurement functions are user-programmable with the EHP-200 control software, which is supplied as standard. Other standard accessories include a 10m optical-fibre cable, carrying bag, plastic pole, mini tripod, battery charger and an operating manual with test and calibration certificates.

With the built-in rechargeable Li-Ion battery providing up to 8 hours of continuous operation, the new field analyser is particularly useful for ensuring safety around the sites of large antennas, controlling the transmitted power in the actual radiation direction, and testing the functionality of the transmitting antennas. In addition, the EHP-200 can effectively measure the wave impedance of the field, thereby enabling users to identify the borders between far-field regions – which have an impedance of 377 ohm – and near-field regions, whose wave impedance is determined by the characteristics of the antennas.

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Directional couplers reduce costs without compromising performance

Link Microtek, the specialist supplier of RF and microwave components, has expanded its range of Tiger Microwave products with the addition of the TGD-A1 series of directional couplers.
These competitively priced devices are manufactured to exceptionally high quality standards and provide excellent performance for a wide variety of military and commercial applications over the frequency range 500MHz to 18GHz.

Equipped with SMA-type female connectors as standard, the directional couplers feature insertion losses as low as 0.4dB and VSWR values ranging from 1.2:1 to 1.6:1, while operating temperature range is specified as -55 to 85degC. They have a directivity of 10dB, 12dB or 20dB and a frequency sensitivity of +/-0.7dB or +/-1.0dB.

Available with coupling values of 6, 10, 20 or 30dB, the TGD-A1 series couplers are particularly suitable for use in microwave test systems and for integration into mobile-phone infrastructure or satellite communications equipment.

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