.. |br| raw:: html

      <br>

SBC RF Antennas
===============

All SBC versions have at least two SMA connectors: SMA1 and SMA2 that are connected internally to GPS1 and GPS2 signal inputs respectively.

.. image:: img/SMA_connectors.png
	:align: center
	:width: 600
	:alt: SBC SMA connectors

In addition to that SMA3 and SMA4 can be used to mount external antennas of some of the SBC peripherals. |br|
SMA3 and SMA4 are connected directly to the MMCX connector next to them, so you can use a pigtail to connect the MMCX conenctor to any of the SBC peripherals. |br|
For example, if you plug the 4G NTRIP master modem on the SBC, you may want to improve the signal reception by adding two external antennas. |br|
You would use a uFL to MMCX pigtail to connect the modem signal output to the MMCX connector and then an external antenna to SMA3 and SMA4.

.. image:: img/pigtails.png
	:align: center
	:width: 500
	:alt: SBC LEDs