User's Manual

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Table 2.1. Approximate depth ranges for different antenna

frequencies.

Antenna

frequency

(MHz)

Lower limit

of object

target size

(m)

Approximate

depth range *

(m)

Approximate penetration

depth (m)

100 0.1 - 1 2 - 15 15 - 25

250 0.05 - 0.5 1 - 10 5 - 15

500 0.04 1 - 5 3 - 10

800 0.02 0.4 - 2 1 - 6

* In normal geological environment absent of low resistive

layers

For the interpretation part the velocity of different geological

environment is needed for the best possible depth

interpretation. The following velocities can then be used (Table

2.2). It has to be remembered that the values given are only

approximate, and can vary greatly with the water content in the

medium. The larger value given for velocity applies to

unsaturated media.