EVK-M8U User Guide
UBX-15023994 - R01
Advance Information
Device description
Page 8 of 26
3
Device description
3.1
Interface connection and measurement
For connecting the EVK to a PC, use a standard SUBD-9 cable and the included USB cable. The use of RS232 and
external power supply is optional. USB provides both power and a communication channel.
Figure 1: Connecting the unit for power supply and communication
3.2
Active antenna
The EVK-M8U evaluation kit includes a GPS / GLONASS / BeiDou antenna with a 3 m cable. It is possible to
connect various active and passive GNSS antennas with SMA connectors to the evaluation unit.
The recommended maximum antenna supply current for active antennas is 30 mA.
3.3
Evaluation unit
Figure 2 shows the front and the rear panel of the EVK-M8U evaluation unit.
Front panel
Rear panel
Figure 2: EVK-M8U evaluation unit – front and rear panels
3.3.1
Antenna connector
An SMA female jack is available on the front side (see Figure 2) of the evaluation unit for connecting an active or
passive antenna. The EVK provides a DC supply at the RF input of 3.3 V for active antennas. The maximum
supported antenna current is 30mA; internal protection limits the maximum short circuit current to 60 mA.
To avoid the damage of RF input caused by ESD or Electrical Overstress, and to seek maximum consistency and
repeatability of performance independently of the RF component used, the EVK-M8U has an onboard LNA.
The connector is only to be used with a GNSS antenna or simulator. Do not connect this
equipment to cable distribution systems.
