Handbook

Table Of Contents
80
Redbox User Handbook No 3
GENERAL INTERFACES
GENERAL INTERFACES - RB-OA3
12
Mix Input Selection
The interface is a 9 pin female D-type and is used to mix a stereo feed into the transmission
path by using the MIX INPUT ON/OFF SWITCH, push button (rear panel, located next to the
mix input). This could be an emergency announcement system, PC automation playout
system, or other audio source.
Note: If this input is not being used it must either be switched o using the push-
button, or terminated by connecting pins 2 & 7 together and pins 4 & 9 together. If it is
not terminated the noise on the transmission output can be worse by 3-6dB.
Mix Input Connector Details
1 Mix Input Right Phase
2 Mix Input Right Non Phase
3 Mix Input Left Phase
4 Mix Input Left Non Phase
5 NC
6 Analogue Ground
7 Impedance Connection
8 Analogue Ground
9 Impedance Connection
Fig 12-13: RB-OA3 Mix Input Connector Denitions.
Fig 12-14: RB-OA3 Mix Input Connector Details.
15
69
If not being used these pins
must be connected
Mix Input Right
Mix Input Left
If not being used these pins
must be connected