HE910 Hardware User Guide
1VV0300925 Rev. 32 Page 67 of 111 2019-11-25
An example of GPS Antenna Supply circuit is shown in the following image:
Figure 7-1 GPS Antenna Suply circuit
NOTE:
The maximum DC voltage applicable to the ANT_GPS pin is 5V. In
case this is exceeded, a series capacitor has to be included in the
design to avoid exceeding the maximum input DC level.
7.3.11. Shielding
Shielding the RF circuitry generally is ineffective because the interference is getting into
the GPS antenna itself, the most sensitive portion of the RF path. The antenna cannot be
shielded because then it can’t receive the GPS signals.
There are two solutions, one is to move the antenna away from the source of interference
or the second is to shield the digital interference to prevent it from getting to the antenna.
7.3.12. GPS Antenna – Installation
• The HE910 due to its characteristics of sensitivity is capable to perform a Fix
inside the buildings. (In any case the sensitivity could be affected by the building
characteristics i.e. shielding).
• The Antenna must not be co-located or operating in conjunction with any other
antenna or transmitter.
• Antenna must not be installed inside metal cases.
• Antenna must be installed also according to the Antenna manufacturer instructions
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