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Hardware Integration Guide
Characteristics
Impedance
VSWR max
Polarization
Typical radiated gain
4.5.
Primary Antenna Diagnostics
The primary antenna diagnostic feature allows the AirPrime AR7558 embedded module to determine
if the primary antenna connected to the module is: open, shorted or normal. The antenna connected
to this interface needs to have a DC resistance to ground of 10 kΩ ± 1k embedded inside.
The ARx55x FW accepts two limits which are used to evaluate the status of the antenna, representing
the short and open thresholds. Refer to document [7] for the syntax of AT+ANTLIMT.
Table 16.
Primary Antenna ADC Characteristics
ADC Voltage Range
Resolution
ADC Values
Voltage/ADC step
1 Assumes 10kΩ Nominal DC resistance in the attached antenna and internal to AirPrime AR7558 device
The following example illustrates the Antenna states and resistance values for a typical limit setting.
AT+ANTLIMT=1,839,1088
Table 17.
Primary Antenna Diagnostics Ranges
Antenna State
Short
Normal
Open
Note:
Highlighted numbers in the table above are programmed as shortLim and openLim using the
+ANTLIMT command.
4.6.
RX2 Antenna Diagnostics
The RX2 antenna diagnostic feature allows the AirPrime AR75580 to determine if the RX2 antenna
connected to the module is: open, shorted or normal. The antenna connected to this interface needs
to have a DC resistance to ground of 10 kΩ ± 1k embedded inside.
4116922
CDMA BC0,
WCDMA B5
RX
869-894
50 Ω
RF
DC
10 kΩ ± 1k
RX
1.5: 1
TX
1.5: 1
Linear, vertical
0 dBi in one direction at least
Min
0
-
0
Min ADC
0
841
1088
Rev 1.1
CDMA BC1,
LTE B4
WCDMA B2
2110 – 2155
1930-1990
Nom
Max
0.9
1.8
15
16383
~0.0011
Max ADC
Antenna Resistance Range
~ ≤ 7 kΩ
839
7 kΩ < x < 13 kΩ
1086
≥ 13 kΩ
1900
RF Specification
LTE B13
746 – 756
Units
Volts
Bit
Volts
January 21, 2015
22
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