Datawell 45100, Manual

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Example 2:
a “maximum setup” for 10 km mainly over fresh water ice with other obstacles will have an
approximate loss of:
+ 2 dB (transmit antenna, see A.2)
- 136 dB (distance over fresh water ice, see A3.1)
- 10 dB (max. wave height 8 meters, see A.3.5)
- 10 dB (some obstacles)
+ 10 dB (normal antenna height of 20 meters)
+ 8 dB (gain of receiving antenna, see A.4)
which adds up to -138 dB which is 5 dB’s more than the maximum loss of -133 dB so that this
setup will
not guarantee reception under all circumstances.