Antenna Specifications |
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| Appendix C | ||||
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| Table 12: Antenna Gain Depending on Cable Length Required |
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| Cable PNs | ANTENNA GAIN | CABLE TYPE | MAX. LENGTH a | MIN. LENGTH |
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| 0 dB (no LNA) | 3 meter (3 dB) | 0 feet |
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| +12 dB | 20 meter (12 dB) | 0 feet |
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| +36 dB | 65 meter (36 dB) | 50 meter (28 dB) |
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a.A 1 dB loss for the coaxial cable is usually required between the
The +26 dB and +36 dB antenna can accept a supply voltage between 5 and 18 VDC. It is recommended to compute the drop in the coaxial cable so the active antenna will always see the minimum operating voltage of 4.5 Volt. Table 13 lists the current taken by each of these antenna.
Table 13: Typical Current Consumption Versus Antenna Gain
Antenna Gain | Current Consumption |
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+12 dB | 20 mA |
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+26 dB | 35 mA |
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+36 dB | 50 mA |
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C.2 Geodetic Active Antenna
For DGPS applications where <1 m accuracy is required, it is strongly recommended you use an active geodetic GPS antenna if possible. In the event where the cable length between the receiver and the antenna is very short (less than one meter), a passive antenna could then be considered. Table 14 lists the specifications for recommended passive antennas. Complete drawings are at the end of this appendix.
SUPERSTAR II User Manual Rev 3 | 57 |