Oricom DTX4000 Operating Instructions Manual page 17

SWP (Swapping Dual RX channel)
The DTX4000 can receive two channels simultaneously.
The main receiver default channel is 12 and Sub receiver default channel
is 40.
The Sub channel can be turned on and off by pressing and holding the
SRX button the "S" indicator on the display will be on if the SRX is on.
It is not possible to transmit on the SRX you must swap the SRX and
Main RX to transmit on that channel.
To adjust the volume of the SRX channel push the channel change dial
3 times the display will show SVL and the level.
SRX On/Off
Press hold SWP/SRX button to turn SRX off.
To return to Dual RX mode press and hold the SRX button for
2 seconds.
Operations
17