LEA-M8S / LEA-M8T - Hardware integration manual
UBX-15030060 - R06
Design
Page 16 of 33
Production information
V), they can use the filtered supply voltage VCC_RF output to supply the antenna (see Figure 9). This
design is used for modules in combination with active antenna.
In case of different supply voltage, use a filtered external supply, see Figure 10.
Active antenna design using VCC_RF pin to supply the active antenna
Figure 9: Active antenna design, external supply from VCC_RF
Active antenna design powered from external supply
Figure 10 shows a design with a direct externally powered active antenna.
This circuit has to be used if the active antenna has a different supply voltage than the VCC_RF (for
example, if a 5 V active antenna is used).
Figure 10: Active antenna design, direct external supply
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In case VCC_RF voltage does not match with the antenna supply voltage, use a filtered external
supply as shown in Figure 10.
Antenna design with active antenna using antenna supervisor
An active antenna supervisor provides the means to check the antenna for open and short circuits
and to shut off the antenna supply if a short circuit is detected. The antenna supervisor is configured
using serial port UBX binary protocol message. Once enabled, the active antenna supervisor produces
status messages, reporting in NMEA and/or UBX binary protocol.
