Studio Technologies 47 - Manual (Page 17)

Model 47 User Guide Issue 1, August 2010
Studio Technologies, Inc. Page 17
power to pins 2 and 3 of the 2-wire PL in-
tercom connectors. The Model 47 will also
provide 200 ohm terminating impedances
for both pins 2 and 3 of the party-line con-
nectors. The DC power and termination
capabilities allow direct powering of dual-
channel intercom belt packs, such as the
RTS BP325. In addition, listen-only belt
packs, such as the Model 34 from Studio
Technologies, Inc. can be directly con-
nected. There’s also no problem connect-
ing single-channel intercom belt packs or
user stations.
2-Wire Nominal Audio Level
DIP switch 2 allows adjustment of the
nominal audio level for the two 2-wire
party-line channels associated with inter-
face 1. When the DIP switch is in its off
(down) position the nominal level is
–14 dBu. This level is compatible with
intercom belt packs 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 belt packs from RTS, such as the
BP325, or listen-only talent amplifier units
from Studio Technologies, Inc. are con-
nected. For best Model 47 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 config-
ure the nominal level of the input and out-
put 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 con-
nected to the Model 47’s 4-wire input and
outputs. This may take a little investigation
but is important for obtaining the best pos-
sible Model 47 performance.
The 0 dBu setting is provided specifically
for use when a Model 47 is interconnected
with a Clear-Com matrix intercom system.
The +4 dBu setting is appropriate when
standard audio lines with “+4” nominal
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 interconnect-
ing the Model 47 with audio signals asso-
ciated 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 switch
3 is off (down) and switch 4 is on (up)
the nominal level is +6 dBu. When both
switches 3 and 4 are in their on (up) posi-
tion the nominal level is configured for
+8 dBu.
Advanced
Configuration
Four DIP switches are provided on the
Model 47’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,
logic refresh, and factory test.