Auxiliary Input & Output - Firecom 3000C Installation & Operation Manual

AUXILIARY INPUT & OUTPUT
On the back of the 3000C, there are 2 jacks labeled "Aux In" and "Aux Out" (Figure 17).
These jacks are 3.5mm mono (2 conductor) jacks. The auxiliary input signal will be mixed
with the radio and the intercom audio. The auxiliary input signal cannot be directed to the
transmit circuits for radio broadcast.
There are 2 adjustments inside the 3000C Intercom which MUST be adjusted if you are
using the Auxiliary Input. These adjustments are performed by adjusting the variable resis-
tors located on the circuit board inside the intercom unit (Figure 18). These adjustments
control the volume of the Auxiliary Audio in the headsets, and if/when the Auxiliary Audio
gets muted when other audio is present in the intercom.
AUXILIARY INPUT VOLUME ADJUSTMENT:
Potentiometer VR5 (Figure 18) adjusts the volume level (in the headsets) of the signal enter-
ing the intercom through the Aux In jack.
Adjust VR5 for the desired volume of the Auxiliary Input (Turning the wheel to the right
increases the volume, and turning the wheel to the left decreases the volume).
AUXILIARY INPUT MUTE CONTROL:
Variable resistor VR2 (Figure 18) adjusts the Mute Control of the Auxiliary Input signal.
The muting of the Auxiliary Input can be adjusted to the following conditions:
• To have the Auxiliary Audio mute when there is Radio Receive Audio, turn the
adjustment wheel to the middle of its adjustment range. This situation may require
some fine tuning to find the proper setting.
• To prevent the Auxiliary Audio from muting, turn the adjustment wheel all the
way to the left.
If you set the muting control all the way to the LEFT, the Auxiliary Audio will be
active all the time and incoming radio messages will not mute the auxiliary
audio.
I N S T A L L A T I O N
FIGURE 17:
3000C Rear Panel
Auxiliary In & Out Jacks
FIGURE 18:
3000C Adjustment
Potentiometers
VR5:
Auxiliary In
Volume Adjust
VR2:
Auxiliary In
Audio Mute
3000C
Circuit Board
(front-right corner)
IMPORTANT
15.