SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R11 Design-in Page 90 of 157
Reported values close to the used diagnostic resistor nominal value (i.e. values from 13 k to 17 k if
a 15 k diagnostic resistor is used) indicate that the antenna is correctly connected.
Values close to the measurement range maximum limit (approximately 50 k) or an open-circuit
“over range” report (see the SARA-R4/N4 series AT Commands Manual [2]) means that that the antenna
is not connected or the RF cable is broken.
Reported values below the measurement range minimum limit (1 k) highlights a short to GND at
antenna or along the RF cable.
Measurement inside the valid measurement range and outside the expected range may indicate an
unclean connection, a damaged antenna or incorrect value of the antenna load resistor for diagnostics.
Reported value could differ from the real resistance value of the diagnostic resistor mounted inside the
antenna assembly due to antenna cable length, antenna cable capacity and the used measurement
method.
☞ If the antenna detection function is not required by the customer application, the ANT_DET pin can be
left not connected and the ANT pin can be directly connected to the antenna connector by means of
a 50 transmission line as described in Figure 34.
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