User's Manual

www.malags.com
24
6 1 GHz shielded antenna
_________________________________________________
The 1 GHz shielded antenna (Fig. 6.1) for RAMAC/GPR has
been designed for surveys on shallow environments such as
roadbeds, concrete constructions, archaeological sites etc.
With the antenna a survey depth in these materials of roughly
1 m (two way travel time of 15-25 ns) can be expected. Local
conditions may however affect this value in both directions.
Figure 6.1 Shielded 1 GHz antenna together with cable hose.
Power is fed through the standard RAMAC/GPR battery pack
that attaches to the top of the antenna. Alternative power
supplies are either to use of the alkaline power pack available
as an extra item or to feed the required power through an
external power cable to the 9-pin connector on the top of the
antenna. The power requirement for the 1 GHz shielded
antenna is 6-14 V DC and a minimum of 1.5 Ah.
Preparing the antenna for survey includes:
?? Connecting the optical fibres to the three connectors. It
is important to connect the fibres as they are marked or
to connect the corresponding colours to the right
connector at the control unit.