Confidential
MANUAL
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Document number
Revision
7/198 17-LXE 108 566 Uen
A
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It is very important not to connect these two signals together. It will create a ground-loop, which results in noise
being added to the audio signals, both ATMS and AFMS.
3.2 Optional Antenna Diagnostic
The GM41 module includes a feature that indicates whether an antenna is available. This feature requires the
application to have a 10k resistor of no more than 5% tolerance built in to the antenna between the antenna and
ground (GND).
Figure 29: Antenna Detect
The following table shows the limitations of the detection circuitry. The antenna status is reported via an AT-
command (AT*E2ANTDI).
Antenna Resistor
Measurement
Antenna status
GM41 SW
Report
Min.
Max.
Unit
Absolute
Antenna Short (BAD)
2
5340
Ω
Grey Area
Antenna Short or Antenna
Normal
5350
6290
Ω
Absolute
Antenna Normal (GOOD)
0
6300
24300
Ω
Grey Area
Antenna Normal or
Antenna Open
24400
30200
Ω
Absolute
Antenna Open (BAD)
1
30300
Ω
Table 27: Antenna Status
