Products
Unshielded Antennas
Unshielded antennas consist of separate transmitter and receiver elements and electronics, allowing them to be operated in several modes for different survey techniques, such as reflection profiling, velocity profiling (common mid-point (CMP), or wide angle reflection and refraction (WARR)), and cross-scanning (tomography). MALÅ ’s unshielded antennas are designed for use in applications that require maximum depth penetration. However, due to the fact that these antennas are unshielded, they are more suitable for use in areas with little or no background noise. Wooden handles are provided for use with the 50, 100 and 200 MHz antennas; these are used to carry the antennas and to also keep them separated and stabilized during measurements. Due to the size of the 25 MHz unshielded antenna elements, wooden handles are not practical, so strapping is provided to aid in separation and carrying. Like all of MALÅ ’s systems, the unshielded antennas have been designed with modularity in mind. The unshielded antenna electronics are compatible and interchangeable across the unshielded range. This reduces the cost for owning or expanding a system.
Brief Description & Technical Specification
MALÅ ’s range of unshielded antennas is operated with the ProEx¹ radar control unit.
25 MHz
The unshielded 25 MHz antennas are suitable for investigations requiring deep penetration. Antenna elements are detachable for easy transportation.
Dimensions: 4.06 x 0.20 x 0.07 m - Weight: 3.85 kg
Applications: geological and stratigraphical surveys in open terrain.
50 MHz
The unshielded 50 MHz antennas are suitable for investigations that require medium to deep depth penetration. They are lightweight and are suitable for one-person operation. Antenna elements are detachable for easy transportation.
Dimensions: 2.06 x 0.20 x 0.07 m – Weight: 2.65 kg
Applications: geological and geotechnical applications.
100 MHz
The unshielded 100 MHz antenna is the most popular in this range and is suitable for a wide range of applications that require medium depth penetration with reasonable resolution.
Dimensions: 1.04 x 0.16 x 0.04 m – Weight: 1.10 kg
Applications: river and lake bottom mapping, landfill studies, Karst, deep pipe and bedrock detection.
200 MHz
The unshielded 200 MHz antennas are suitable for investigations that require mid-range penetration depth with good resolution. The compactness of the antenna facilitates surveys in more vegetated terrain.
Dimensions: 0.54 x 0.16 x 0.04 m – Weight: 0.55 kg
Applications: utility detection, bedrock and cavity detection.
Unshielded Accessories
A number of accessories are available for the unshielded antennas, including:
- Soft-sledge for long profiles
- Options for distance measurement and trace triggering
- Fiber optic cables are available in several lengths
¹ Requires shielded antenna electronics (22-001267).
More information: at manufacturer's site
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