Manual

Model 381 User Guide Issue 2, March 2020
Studio Technologies, Inc. Page 15
MODEL 381
ON-AIR BELTPACK
pushbutton switch will flash on and off ap-
proximately eight times. (Of course, the
Identify command will not change the on/off
status of the button.) In addition, the SYS
and SYNC status LEDs, located directly
below the etherCON RJ45 connector on the
bottom panel, will slowly flash green. After a
few seconds this LED identification pattern
will cease and normal Model 381 talkback
button LED and Dante status LED operation
will resume.
Ethernet and Dante Status
LEDs
As previously mentioned, there are three sta-
tus LEDs located below the etherCON RJ45
connector on the Model 381’s bottom panel.
The LINK ACT LED lights green whenever
an active connection to a 100 Mb/s Ethernet
network has been established. It will flash
in response to Ethernet data packet activ-
ity. The SYS and SYNC LEDs display the
operating status of the Dante interface and
associated network. The SYS LED will light
red upon Model 381 power up to indicate
that the Dante interface is not ready. After a
short interval it will light green to indicate that
it is ready to pass data with another Dante
device. The SYNC LED will light red when
the Model 381 is not synchronized with a
Dante network. It will light solid green when
the Model 381 is synchronized with a Dante
network and an external clock source (tim-
ing reference) is being received. It will slowly
flash green when the Model 381 is part of a
Dante network and it is serving as a clock
master. It’s possible that up to 30 seconds
may be required for the SYNC LED to reach
its final state.
P48 Status LED
A red LED indicator is located on the
bottom panel adjacent to the microphone
input connector. It is labeled P48 and will
light whenever the P48 phantom power
source is active and providing power to
the microphone input.
Compressor Active LED and
Mic Preamp Gain
An orange LED indicator is located on the
bottom panel, also adjacent to the micro-
phone input connector. It is labeled COMP
and displays the status of the microphone
audio compressor function. This function
controls the dynamic range of the audio
signal that is sent to the talkback output
channel as well as being used by the side-
tone function. This signal may also, depend-
ing on a configuration setting, be present on
the Dante main output (transmitter) channel.
The compressor LED will light whenever the
input signal from the microphone, along with
the configured mic preamp gain, is of suf-
ficient level such that the dynamic range of
the microphone signal is being actively con-
trolled. It’s perfectly acceptable for this LED
to light intermittently whenever a user is talk-
ing at a normal voice level into an associat-
ed microphone. But if the COMP LED lights
solid orange while a user is talking at a nor-
mal voice level this will typically indicate that
the mic gain should be reduced. Conversely,
if the COMP LED almost never lights when
normal talking is taking place, it’s likely that
changing the gain to a higher value would
be beneficial. Note that due to the design of
the circuitry the compressor active LED will
function whether or not the main, talkback,
or sidetone functions are active.
Headphone Output – General
Users should find the headphone output
audio quality to be excellent, with high maxi-
mum output level and low distortion. Two
rotary controls (potentiometers or “pots”) are
located on the top panel and are “push-in/
push-out” type. This allows their associated