6
On the back panel, there are six connectors:
RF input (marked “Tx”, standard SO-239 socket)
Antenna connector 1 (marked "Ant 1", standard SO-239 socket)
Antenna connector 2 (marked "Ant 2", standard SO-239 socket)
DC power in (2.5 by 5.5 mm power jack marked "Power", center positive)
DB-9 serial data port marked "Serial" for connecting a control cable to a PC
Ground connector (wing nut)
