11
RA
K20
11
RAK
7248
11
Conditions
Temperature
Humidity
Working
-35 ºC ~ +80 ºC
0% ~ 95%
Storage
-40 ºC ~ +85 ºC
0% ~ 95%
Table 7| GPS Environmental Requirements
3.2.4GPS Antenna Parameter
Antenna specifications are listed in the table below:
Item
Specifications
PET
Range of Receiving Frequency
1575.42±1.1
±2.5
Center Frequency (MHz) w/ 30mm2 GND plane
1575.42
±3.0
Bandwidth (MHz) (Return Loss
≤
-10dB)
≥10
±0.5
VSWR (in Center Frequency)
≤2.0
±0.5
Gain (Zenith) (dBi Typ.) w/ 70mm2 GND Plane
4.5
±0.5
Axial Ratio (dB) w/ 70mm2 GND Plane
3.0
±0.2
Polarization
Right-Handed Circular
-
Impedance (Ω)
50
-
Frequency Temperature Coefficient (ppm/ºC)
0±10
-
Table 8| GPS Antenna Paramete
Amplifier Specifications are listed in the table below:
Item
Specifications
Frequency Range
1575.42 MHz
Gain
27 dB
VSWR
≤ 2.0 V
Noise Coefficient
≤ 2.0 dBm
DC Voltage
3 ~ 5 V
DC Current
5 ± 2 mA
Table 9| Amplifier Specifications
Environmental test performance specifications are listed below:
Item
Normal Temp.
High Temp.
1
Low Temp.
2
Amplifier Gain
27dB ± 2.0
27dB ± 2.0
27dB ± 2.0
VSWR
≤ 2.0
≤ 2.0
≤ 2.0
Noise Coefficient
≤ 2.0
≤ 2.0
≤ 2.0
1. High temperature test: soap in temperature (85º C) and humidity (95%) chamber for 24-
hour and return to normal temperature (at least for 1-hour) without visual shapechange.
