2.4.2 Modem Placement & Antenna Connectors
⚠
Make sure the Skywire is installed in the correct orientation in your host
board. Failure to do so will damage the modem and void the warranty.
Skywire modems use U.FL RF connectors for connecting antennas to the modem's
LTE and GNSS RF interfaces. U.FL connectors must be carefully handled to avoid
damage and users should always use a U.FL extractor tool for connecting and
disconnecting the U.FL connectors. The U.FL connectors should always be inserted
and removed with a force that is perpendicular to the modem.
The Skywire modem's RF interfaces are labeled X1, X2, and X3. Each interface has a
specific function as documented below. The locations of the interfaces may change
depending on the modem and it is recommended that users carefully review the
modem's documentation before connecting antennas before powering up the modem.
Users should not attempt to place the modem in the Skywire socket or attach the U.FL
connectors while power is applied.
To seat the modem, align the Skywire modem's top side U.FL connectors with the two
circles seen on the top of the SWDK2's Skywire socket.
⚠
Make sure that the modem's pins are properly aligned in the Skywire socket.
Inserting the modem into the Skywire socket incorrectly can damage the
modem.
PN 1002634 REV 1
© NimbeLink Corp. 2021. All rights reserved.
10
RF Interface
Function
Notes
X1
LTE Primary RF Antenna Interface
(TX/RX)
This interface must have an antenna
attached for network connectivity.
X2
LTE Diversity Antenna Interface
(RX)
This interface must have an antenna
attached for Cat 4+ products for carrier
certification compliance and is strongly
recommended for Cat 1+ devices.
X3
GNSS Antenna Interface
Do not connect to cellular antennas. This
interface requires the use of an appropriate
GNSS antenna. Review the modem's
datasheet for GNSS antenna guidelines.
