34
1
2
PTT
1
PTT
2
PTT
1
PTT
2
PTT
PTT
PTT
PTT
Ch. 1
Ch. 2
3
1
2
 PTT symbol explanation:
PTT for internal intercom
PTT
PTT
PTT for radio in external vehicles
11.3.2.  INTERCOM + TWO RADIOS, MULTIPLE 
RADIO CHANNELS
Buttons on the SCU-300 for this scenario:
•  The PTT I button is PTT for Radio 1, channel 1.
•  The PTT II button is PTT for Radio 2, channel 1.
•  The + button is PTT for the intercom system.
•  The - button is PTT for radio outside the vehicle.
Radio 1, channel 2 and Radio 2, channel 2 are listen only.
Buttons on the RCU-300 for this scenario:
•  The PTT I button is PTT for Radio 1, channel 1.
•  The PTT II button is PTT for Radio 2, channel 1.
•  The + button is PTT for the intercom system.
•  The - button is PTT for radio outside the vehicle. 
EN
Radio 1, channel 2 and Radio 2, channel 2 are listen only. 
3
PTT
1.1
PTT
2.1
PTT
1.1
PTT
2.1
PTT
PTT
PTT
PTT
Ch. 1.1
Ch. 1.2
Ch. 2.1
Ch. 2.2
1
2
EN