Manual

Model 47A User Guide Issue 2, January 2020
Studio Technologies, Inc. Page 17
Studio Technologies, Inc. can be directly
connected. There’s also no problem con-
necting single-channel intercom beltpacks
or user stations.
2-Wire Nominal Audio Level
DIP switch 2 allows adjustment of the nom-
inal audio level for the two 2-wire party-line
channels associated with interface 1. When
the DIP switch is in its off (down) position
the nominal level is –14 dBu. This level is
compatible with intercom beltpacks from
manufacturers such as Clear-Com. When
the DIP switch is in its on (up) position the
nominal level is –10 dBu. This setting is
appropriate when beltpacks from RTS,
such as the BP325, or listen-only talent
amplifier units from Studio Technologies,
Inc. are connected. For best Model 47A
performance it’s important that the 2-wire
nominal level selection be made correctly.
4-Wire Nominal Audio Level
DIP switches 3 and 4 are used to configure
the nominal level of the input and output
circuitry associated with interface 1’s two
4-wire input and output connections. Four
level settings are available: 0, +4, +6, and
+8 dBu. Prior to setting these DIP switches
it’s important to determine the nominal
audio level of the equipment connected to
the Model 47A’s 4-wire input and outputs.
This may take a little investigation but is
important for obtaining the best possible
Model 47A performance.
The 0 dBu setting is provided specifically
for use when a Model 47A is intercon-
nected with a Clear-Com matrix intercom
system. The +4 dBu setting is appropriate
when standard audio lines with “+4” nomi-
nal levels are interconnected. The +6 dBu
setting can be appropriate when intercon-
necting with equipment manufactured in
Europe, such as the digital matrix intercom
systems from Riedel. The +8 dBu setting is
provided specifically when interconnecting
the Model 47A with audio signals associ-
ated with an RTS ADAM-Series of matrix
intercom system. This includes the related
RVON-I/O unit.
When DIP switches 3 and 4 are in their off
(down) position the nominal level is set for
0 dBu. When DIP switch 3 is on (up) and
DIP switch 4 is off (down) the nominal level
is +4 dBu. When DIP switch 3 is off (down)
and DIP switch 4 is on (up) the nominal
level is +6 dBu. When both DIP switches 3
and 4 are in their on (up) position the nomi-
nal level is configured for +8 dBu.
Advanced
Configuration
Four DIP switches are provided on the
Model 47A’s back panel. They allow the
two interfaces to be configured for sev-
eral advanced operating modes. Refer to
Figure 6 for a detailed view of these DIP
switches. The available configurations
include auto terminate, auto null button,
pin 3 power disable, and factory test.
Figure 6. Detail of back panel showing the
advanced mode DIP switches