System MINI¶

The System Blue Mini, or System Mini for short, is a System Blue in which some unimportant components have been omitted for cost reasons. It supports two H-field channels. This is the main application of ​​application for the detectors. The third H-field channel and the E-field channel have been omitted. Furthermore, certain filter options that should only be used in noisy environments have been omitted. The detector works optimally with the preamplifier PCB 23.1. The u-blox MAX-M10S was installed as the new GNSS module. It supports the simultaneous reception of various GNSS (GPS, GLONASS, Galileo, and BeiDou). System Mini is powered via a USB-C socket.

Assembly¶

The PCBs have several through-hole technology (THT) components which need to be soldered by yourself. As they are almost identical to the BLUE PCBs you can use the assembly instructions there.

Some additional notes:

• The RJ-45 HanRun socket with the LEDs is the Ethernet socket. The other RJ-45 socket is the connection to the preamplifier.
• The electrolytic capacitor C500 (560µF – 1000µF) is only necessary if you use an untrustworthy power supply or if the board is powered via the terminal. Do not solder this capacitor if you are using an intelligent USB-C power supply, such as the one used to charge notebooks.
• If you have one of the test boards 22.0/1, then please do not change the jumper settings, these are for selecting different power supply options for some components and for the coding of the board.

H-field preamplifier 23.1¶

The H-field preamplifier PCB 23.1 has 6 input pins. The two outer pins, pin 1 and pin 6, are ground. They can be used for shielding antennas. Pin 2 and 3 is the first amplifier input, pin 4 and 5 is the second amplifier input.

Operation¶

The firmware for System MINI is the same as BLUE, but only the two amplifier inputs are shown.