Studio Technologies 770 - Page 27

Model 770 User Guide Issue 1, October 1997
Studio Technologies, Inc. Page 27
Model 770
of the Model 770s single IFB channel.
An example would be where on-air talent
and a field producer were equipped with
Model 32 Talent Amplifiers. The talent
would listen to IFB audio on channel 1.
By assigning main audio to channel 2, the
field producer could normally monitor the
main bus of the mixer section, while hav-
ing the ability to quickly switch to the IFB
signal on channel 1. Note that the same
3-conductor cable would be supporting
both the talent the field producers Model
32 Talent Amplifiers!
Another example would be to assign IFB
program only audio to channel 2. Sepa-
rate Model 32 Talent Amplifiers could be
provided to a field reporter and the guests
to be interviewed. By setting the source
switch on the Model 32 to channel 2,
interviewees would hear program audio,
without unfamiliar and unwanted IFB
audio.
A third example could be for a sports
event where a separate non-interrupt
signal needs to be monitored at all times.
Assigning the mixer sections AUX audio
bus to channel 2, and providing a Model
33 Talent Amplifier to the on-air talent
would achieve this. A mix of the IFB signal
and AUX audio could easily be created
by using the Model 33s level controls.
1kHz Direct Output
The 1kHz direct output is a line-level
output that provides direct access to the
1kHz tone signal. A trim potentiometer
allows adjustment of the output level from
approximately +3 to +7dBu. The trim pot
is located on the back panel, directly
above the 1kHz direct outputs ¼-inch
phone jack. At the factory this output is
loaded with 100k ohms, and then the trim
pot is adjusted to give an output level of
+4dBu.
If the 1kHz direct output is to be used in
an installation, its important that its output
level be adjusted to precisely match the
requirements of the system. Also note that
while the output circuitry is capable of
driving loads of 600 ohms or greater, the
output level will drop slightly as the load
impedance approaches 600 ohms.
Figure 9. Detail of back panel showing 1kHz
tone direct output configuration