Geoscanner - GCB
Geological Radar
    Model: GCB 100/200/300/400/500/700/1000/1500/2000/3070
    Country of Origin: Sweden
    Use: GCB-100 is fully shielded with a very high front-to-back ratio, making it an ideal choice for noisy environments. If a survey that requires deep penetration is on the agenda, then GCB-100 is the perfect companion. It is therefore perfectly suited for deep geotechnical surveys and archeological investigations.
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GCB-100 is a 100MHz ground coupled bow tie antenna and the smallest 100 MHz antenna on the market, weighing only 11.5kg(23.14 pounds). GCB-100 is fully shielded with a very high front-to-back ratio, making it an ideal choice for noisy environments. If a survey that requires deep penetration is on the agenda, then GCB-100 is the perfect companion. It is therefore perfectly suited for deep geotechnical surveys and archeological investigations. As with all other antennas manufactured by Geoscanners, this antenna is fully compatible with the rest of the Geoscanners products. Furthermore, GCB-100 is also compatible with GSSI control units. This gives endless possibilities and allows the user to change antennas without having to purchase complete new systems. The high efficiency of GCB-100, together with the excellent sensitivity of the receiver electronics, allows for very deep surveys with outstanding resolution and clarity of the data. All of this is possible while still having a small and light weight antenna.

GCB-100 is perfectly suited for relatively deep utility detection. Depending on the relative dielectric permittivity (RDP) of the area under survey and its electrical conductivity properties it is possible to reach down to 15 meters penetration with this antenna. The data shown in figure 1 shows the results obtained from surveying a sandy road in the forest outside Boden, Sweden. It shows good penetration, way beyond the 15 meters depth, and excellent resolution of the different layers. It is important to keep in mind that in areas with high conductivity values of the order of 5 mS and more, the penetration can be heavily affected. Setting in these conditions very long ranges and high gains it is not going to improve the situation in any favorable way



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