USL UPC-21 - Manual (Page 9)

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Connect an IRP-20 DC power supply to each of the IRC-21s. Connect a 75
ohm coaxial cable from the RF OUT connector on the unit being driven with
audio (the master) to the RF IN connector on the slave unit. Additional slave
panels may be similarly cascaded from the first slave panel. On the master
panel, turn on the internal RF Source switch, and turn off the external RF
Source switch. On slave panels, turn on the external RF Source switch and
turn off the internal RF source switch.
AN INSTALLATION USING TWO IRC-21S