Spectracom Corporation
EPSILON CLOCK MODEL EC22S
EPSILON CLOCK User’s Manual
8-3
of the sky, at an angle higher than or equal to 65° (optimum at 85°), is recommended
per the following example:
Figure 8 - 1. GPS Antenna Locations.
NOTE:
The open view angles are given according to the criteria of a complete GPS
constellation of 24 satellites, evenly distributed i around the Earth.
8.2.2 Gain calculation
To ensure the correct reception of the GPS signal, the overall system of antenna /
cable / protection (and line amplifier / splitter if used) requires a relative gain of 15 to
30 dB.
Example:
GPS Signals
GPS antenna placed in direct view of the sky
50 m of KX4 cable (-30 dB typical / 100 m)
G1 = 35 dB typical
G2 = - 15 dB
EPSILON SSU
Lightning protection
G3 = -1 dB
Figure 8 - 2. Gain calculation.
G1 + G2 + G3 = 35 dB - 15 dB - 1 dB =
19 dB
Thus: 15 dB < G1 + G2 + G3=19 dB < 30 dB
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