Studio Technologies 41 2013 - Manual (Page 10)

Issue 3, November 2013 Model 41 User Guide
Page 10 Studio Technologies, Inc.
balanced or unbalanced sources. A bal-
anced source should be wired so that sig-
nal high is connected to the + pin, signal
low to the – pin, and shield to the shield
pin. With an unbalanced source, connect
signal high to the + pin, and shield to both
the – and the shield pins. If connecting an
unbalanced source in this manner results
in hum or noise, try connecting signal high
to the + pin, and shield to the – pin; leave
the shield pin unterminated.
As previously mentioned, the Model 41 is
compatible with matrix intercom systems
from Riedel. Appendix A, located near the
end of this user guide, provides detailed
connection information.
IFB Outputs
The Model 41’s four independent IFB out-
puts each supply DC power and two chan-
nels of unbalanced audio. The IFB outputs
are designed to connect to a variety of
devices that conform to the broadcast
IFB standard. In this implementation pin
1 is used for a combination of shield, DC
power return, and audio common;
pin 2 supplies a combination of DC power
and one channel of unbalanced audio;
pin 3 supplies a second channel of unbal-
anced audio. The DC power supplied on
pin 2 is 30 volts with a maximum current
of 220 milliamperes. The audio superim-
posed on the DC power has a nominal
signal level of –10 dBu. Its audio source
is the channel 1 audio input associated
with that specific IFB output. The audio
on pin 3 also has a nominal signal level of
–10 dBu. Its audio source is the channel
2 audio input associated with that specific
IFB output.
Signal Signal
Connections High (+) Low (–) Shield
IFB Output 1-Channel 1 24 12 25
IFB Output 1-Channel 2 10 23 11
IFB Output 2-Channel 1 21 9 22
IFB Output 2-Channel 2 7 20 8
IFB Output 3-Channel 1 18 6 19
IFB Output 3-Channel 2 4 17 5
IFB Output 4-Channel 1 15 3 16
IFB Output 4-Channel 2 1 14 2
Notes:
1) Connector type on Model 41 is 25-pin D-subminiature
female. Installer must provide plug (male). Connector uses
4-40 threaded inserts for locking with mating plug.
2) Wiring scheme follows TASCAM DA-88 convention.
Standard DA-88-style wiring harnesses are directly
compatible, with the exception of 4-40 screw threads being
required.
Figure 4. Connections for audio inputs using
dual-channel nomenclature
Signal Signal
Connections High (+) Low (–) Shield
IFB Output 1-Interrupt 24 12 25
IFB Output 1-Program 10 23 11
IFB Output 2-Interrupt 21 9 22
IFB Output 2-Program 7 20 8
IFB Output 3-Interrupt 18 6 19
IFB Output 3-Program 4 17 5
IFB Output 4-Interrupt 15 3 16
IFB Output 4-Program 1 14 2
Notes:
1) Connector type on Model 41 is 25-pin D-subminiature
female. Installer must provide plug (male). Connector uses
4-40 threaded inserts for locking with mating plug.
2) Wiring scheme follows TASCAM DA-88 convention.
Standard DA-88-style wiring harnesses are directly
compatible, with the exception of 4-40 screw threads being
required.
Figure 3. Connections for audio inputs using
IFB nomenclature