Studio Technologies 220 2008 - Manual (Page 25)

Model 220 User Guide Issue 4, October 2008
Studio Technologies, Inc. Page 25
discussed, the power source can be
provided by an IFB circuit, an external 24
volt DC power source, or both. It’s impor-
tant to highlight the fact that the Model
220 is an active device. Audio signals will
not be present on the outputs if correct
power has not been supplied. Specifically,
the microphone does not passively “cut
through” to the main output connector!
Upon Model 220 power up, the four status
LEDs will light in succession as a firmware
“boot up” indication. The unit will then
begin normal operation. Depending on
the selected configuration, one LED as-
sociated with the status of the main output
may be lit. The user is now presented with
three buttons, four LEDs, and two rotary
controls. These are simple to operate and
understand, as will be described in the fol-
lowing paragraphs.
Pushbutton Switches and
Status LEDs
Three pushbutton switches are used to
control the main and talkback outputs.
The way each operates depends on the
selected configuration. Four LED indica-
tors are located adjacent to the buttons.
They reflect the status of the main and
talkback output functions.
Main Output Button and LED Indicators
The button on the left, factory labeled
as COUGH, functions according to the
selected configuration. Two LED indica-
tors, located directly above the button, are
associated with the status of the main out-
put. The green LED, located on the right,
is lit whenever the main output is active.
This could be considered as an “on-air” or
mic active indicator. At the least it should
serve as a “careful what you say” warn-
ing! If the Model 220’s system mode is
configured to on-air, the red LED, located
on the left, will be lit when the main output
is muted. This indicates that it’s safe to
speak as one sees fit.
If the Model 220’s system mode is config-
ured to production, the red LED will never
light. This is to reflect the fact that the main
output button has now taken on a function
similar to that of one of the talkback output
buttons. To clarify, when the Model 220 is
set to the production mode, the red LED
will never light; the green LED will light
whenever the main output is active.
Main Output Button Modes
• Push to mute: If this mode is selected
the main output is normally active. The
main output will mute whenever the but-
ton is pressed and held.
• Push to talk: If this mode is selected
the main output is normally muted. The
main output will become active when-
ever the button is pressed and held.
• Alternate action: If this mode is selected
the main output will alternate between
its active and muted states whenever
the button is pressed. Upon power up
the main output will be in its muted
state.
• Hybrid: This mode is a combination
of push to talk and alternate action. It’s
similar to the way talk buttons function
on user stations associated with broad-
cast or production intercom systems.
If the button is pressed and held, the
main output will become active until
the button is released. If the button is
momentarily “tapped” the main out-
put will change state. Upon Model 220
power up the main output will be in its
muted state.