2 Front Panel Controls, Connections & Indicators
4
The audio call is not shown on talk channels that are active. By default, the
talk buttons have a momentary action that will automatically latch in the on
state if pressed briefly.
Channel 1 to 8 IFB/4W Select Switches
These switches select the operating mode for each channel, either 4 wire
or interruptible fold back. The IFB input to each channel can be either the
channels own 4W IN input, or one of the two dedicated programme inputs,
IFB A or IFB B. This selection is made in the configuration options using
either the on-board configuration mode or the embedded web server. See
the Configuration Options section. As an alternative to the standard IFB
modes, where the microphone signal interrupts the IFB signal when the
channel is active, an additional option allows the microphone signal to be
mixed with the IFB signal. In this mode, when a talk channel is activated,
the level of the selected IFB input signal on that channel is reduced by 12dB
prior to being mixed with the microphone signal.
To use a talk channel in 4W mode:
put the IFB/4W switch in the 4W
position. In this mode, the signal on the 4W IN input connector is routed to
the headphones/headset and loudspeaker at the level set by the channels
own monitor level potentiometer, with the overall level controlled by the
MON level potentiometer. When the talk button is pressed, the microphone
signal is routed to the channels talkback output at the TB OUT connector,
and the level of the feed to the loudspeaker (not headphones/headset) is
reduced by the level preset by the dim potentiometer.
To use a talk channel in IFB mode:
put the IFB/4W switch in the IFB
position. In this mode, the signal on the 4W IN input connector is routed to
the headphones/headset and loudspeaker at the level set by the channels
own monitor level potentiometer, with the overall level controlled by the
MON level potentiometer. The signal from the selected IFB input, either
the channels own 4W IN input or one of the dedicated programme inputs,
IFB A or IFB B, is routed to the talkback output at the TB OUT connector.
When the talk button is pressed, the signal at the talkback output is either
replaced by or mixed with the microphone signal, and the level of the feed
to the loudspeaker (not headphones/headset) is reduced by the level preset
by the dim potentiometer.
Channel 1 to 8 Monitor Level Potentiometers
These controls set the level of the signal that is routed to the monitor
headphones/headset and loudspeaker from each channels input.
Loudspeaker Mute Button
The loudspeaker mute cuts the signal fed to the loudspeaker and the
loudspeaker output on the rear panel. The mute can also be activated via a
remote input, see the Remote section. The button has a latching action and
illuminates red when activated or flashes red to indicate the loudspeaker
mute has been activated by the remote input. The button also indicates
when the loudspeaker dim is active by illuminating green. The mute button
does not affect the signal routed to the headphones.
Loudspeaker Dim Potentiometer
The loudspeaker dim pre-set potentiometer controls the level of
attenuation applied to the signal fed to the loudspeaker and rear panel
loudspeaker output when any of the talk channels are active, or the
loudspeaker dim remote input is active. The attenuation range is between
full on and muted and it is adjusted using a small flat blade screwdriver.
Monitor Level Potentiometer
The monitor level potentiometer controls the overall level of the signal
routed to the headset/headphone outputs, the loudspeaker and the
loudspeaker output on the rear panel.
