User's Manual

DE910 Series Hardware User Guide
1vv0301183 Rev.1 – 2015-2-13
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 41 of 70
An example of GNSS antenna supply circuit is shown in the following image:
When using the Telit DE921, since there’s no antenna connector on the module, the antenna
must be connected to the DE921 through the PCB with the antenna pad.
In the case that the antenna is not directly connected at the antenna pad of the DE921, then a
PCB line is required.
This line of transmission shall fulfill the following requirements:
Antenna Line on PCB Requirements
Characteristic Impedance
50Ohm
Max Attenuation
0.3dB
Coupling with other signals shall be avoided
Cold End (Ground Plane) of antenna shall be equipotential to the DE921 ground pads
Furthermore if the device is developed for the US and/or Canada market, it must comply with
the FCC and/or IC requirements.
This device is to be used only for mobile and fixed application.
WARNING:
The DE921 software is implemented differently depending on the configurations of an
external device. Please refer to the AT command User Guide in detail.