Manual

Model 348 User Guide Issue 1, January 2020
Studio Technologies, Inc. Page 21
MODEL 348
INTERCOM STATION
pushbutton switches will “flash” in a unique
sequence four times; the actual on/off status
of the buttons will not change. In addition,
the LINK ACT and GbE status LEDs, located
directly below the two RJ45 connectors on the
back panel, will slowly flash. After a few sec-
onds the LED identification patterns will cease
and normal Model 348 pushbutton LED, and
Ethernet status LED operation will resume.
Headset Microphone Power
Status LED
An LED indicator is located on the back panel
adjacent to the Headset A connector. It is
labeled MIC PWR and will light red whenever
the headset’s microphone electret power
source is active and providing low-voltage DC
power to the microphone connections on the
Headset A and Headset B connectors.
Compressor Active LED and
Mic Preamp Gain
An LED indicator, orange in color, is located
on the back panel adjacent to the Headset A
connector. It is labeled COMP and displays
the status of the microphone audio compres-
sor function. This function controls the dynam-
ic range of the audio signal associated with
the selected microphone input source. (This
will be either the headset’s microphone or
the gooseneck microphone.) The compressor
LED will light whenever the input level from
the active microphone, along with the config-
ured microphone preamplifier gain, is such
that the dynamic range of the signal is being
actively controlled. It’s perfectly acceptable
for this LED to light intermittently whenever a
user is talking at a normal voice level into an
associated microphone. But if the COMP LED
lights solid while a user is talking at a normal
voice level this will typically indicate that the
microphone preamplifier gain setting should
be reduced. Conversely, if the COMP LED
almost never lights when normal talking is tak-
ing place it’s possible that changing the gain to
a higher value would be beneficial. Note that
due to the design of the circuitry the compres-
sor active LED will function whether or not the
main or talkback functions are active.
LED Intensity
On the Model 348’s front panel there are LED
indicators associated with the eight channel
pushbutton switches, the mic source status
display, and the ten rotary encoders. Using the
STcontroller application the intensity of these
LEDs, as a group, can be configured from
among two choices, low or high. If during op-
eration the LED intensity isn’t perceived to be
optimal the configuration choice in STcontroller
should be checked and revised if necessary.
In most cases the default intensity, high, will
be applicable. However, the low LED intensity
configuration choice may be superior in ap-
plications where the ambient light in the Model
348’s location is also low.
Mic Source Selection
A small, round pushbutton switch located on
the upper-left side of the front panel is used
to select which microphone source is active.
This audio source will be used as needed by
the Model 348’s talk, sidetone, and IFB func-
tions. The mic source choices are Headset and
Gooseneck. Two green LEDs, adjacent to the
pushbutton switch, indicate which microphone
source is currently active. A Model 348 power-
down/power-up cycle will return the micro-
phone source to its last selection.
A system configuration choice in STcontroller
allows the microphone source selection to
impact the on/off status of the headset’s head-
phone outputs and the monitor output chan-
nels. Named Follow Mic Source, this selection
is provided to assist users who frequently
change between using the headset’s micro-
phone and the gooseneck microphone. The