Brainstorm Electronics DXD/GPS, Руководство по эксплуатации

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Page 26 DXD/PTP/GPS User Manual (rev 2.10)
18.3 Appendix C: GNSS Antenna Recommendations
Below are recommendations for active and passive antennas. Both can be used with the DXD/GPS. However, the distance
between the antenna and the receiver is an important factor in selecting the proper antenna. The GPS signal is very weak and
needs to be amplified to travel down a long cable to the receiver. The gain of the antenna and the quality of the cable will
determine the maximum cable length.
18.3.1 RECOMMENDED ACTIVE ANTENNA
[*1] Including cable loss / High Gain mode (FLNA: Open)
[*2] Including cable loss / Low Gain mode (FLNA: High)
[*3] For best jammer resistance (and lower power consumption), use 10 dB lower gain than the max gain.
18.3.2 RECOMMENDED PASSIVE ANTENNA
[*1] High Gain mode (FLNA: Open)
Item MIN TYP MAX Unit Note
GPS/QZSS center frequency - 1575.42 - MHz 2.046 MHz bandwidth
GLONASS center frequency - 1602 - MHz 9 MHz bandwidth
Galileo center frequency - 1572.42 - MHz 4.092 MHz bandwidth
Antenna element gain 0 - - dBi
Amplifier gain1 10 - 35 [*3] dB [*1]
Amplifier gain2 15 - 50 [*3] dB [*2]
Amplifier NF - 1.5 3 dB
Impedance - 50 - Ω
VSWR - - 2 -
Item MIN TYP MAX Unit Note
GPS/QZSS center frequency - 1575.42 - MHz 2.046 MHz bandwidth
GLONASS center frequency - 1602 - MHz 9 MHz bandwidth
Galileo center frequency - 1572.42 - MHz 4.092 MHz bandwidth
Antenna element gain 0 - - dBi [*1]
Impedance - 50 - Ω
VSWR - - 2 -