Additional Information

Owned by Thomas Möller
Last updated: 10 Nov, 2022
2 min read

Noise from the Processor Board:

The processor board which the USB Connect 4G - XX is connected to may emit RF noise signals which results from the clocks of the processor as well as the data rate of digital interfaces such as USB. This RF noise may be received by the internal antenna of the USB Connect 4G - XX and therefore may limit your receive sensitivity. This may lead to a considerable lower RX-sensitivity in the down link. Therefore the following is recommended:

  • Ensure proper EMC-shielding of the processor board.

Noise from an active USB-Connection:

The USB-connection is a high speed data interface with a clock, which might also cause interfering RF-noise. The USB 2.0 clock noise shows up at multiples of 480 MHz since the USB clock is 48 MHz * 10 = 480 MBit/s. This type of RF-noise is quite commonly seen at 480/960 MHz on USB powered wireless devices. This might affect performance of the USB Connect LPWA in the lower frequency bands.

Therefore the following is recommended:

  • Ensure proper EMC-shielding of the USB-Connection.

 

SIM Card Access

  • Unscrew the enclosure of side with the label.

  • Lift off the enclosure halve at the front of the USB connector and then pull in the direction of the USB connector.

  • Now you can see the SIM card holder and open its flaps by sliding them in the opposite direction from the USB connector. You are now able to put any 3FF SIM card in the holder.

  • To reassemble, go backwards.

 

Effects of mechanical shocks

If the stick falls vertically onto the USB connector, there is a possibility that the flap of the SIM card holder will open and the SIM card will fall out. A cover is offered for this case, which additionally blocks the mechanism of the SIM card holder and thus fulfills special stress requirements.

The SIM cover is placed as follows:

Integration USB Connect 4G - XX

The maximum performance over all LTE bands results when the USB Connect 4G - XX is connected vertically to a PCB. There may be small metal parts 2 cm near the USB stick, but they must not occupy entire side surfaces. In any case, there must be no metal parts on the top of the USB Connects 4G - XX.