Studio-technologies 770 Bedienungsanleitung PDF herunterladen (Seite 18)

Issue 1, October 1997 Model 770 User Guide

Page 18 Studio Technologies, Inc.

Model 770

ground loops will be isolated, protecting

the Model 770 and related equipment that

is located inside the vehicle.

The IFB line output was designed to pro-

vide a fully isolated output with decent

sonic performance. It was NOT designed

to drive full level into 600 ohm loads! While

a 600 ohm load can be connected without

damage, a 3-4dB level drop should be

expected. Used with 2k ohm or greater

loads, the IFB line output will provide its

full specified performance.

IFB Monitor Output

The IFB monitor output is designed for

connection to an audio power amplifier

associated with a monitor loudspeaker. In

mobile applications it may prove common

for an amplified speaker, such as from

Fostex, to be connected. The IFB monitor

output is similar to the monitor output

associated with the Model 770s monitor

section. The difference lies with the signal

source. While the monitor sections moni-

tor output allows the audio source to be

selected from among five choices, the

audio source for the IFB monitor output is

always the IFB signal. By having two

monitor outputs, an operator can monitor

his or her desired source, while ensuring

that important talent cues will not be

missed.

The IFB monitor output is electronically

balanced, line-level, and can drive a bal-

anced or unbalanced load of 600 ohms

or greater. A ¼-inch 3-conductor phone

jack is utilized for interconnection. Prepare

the mating connector (plug) so that tip is

signal high (+ or high), ring is low ( or

cold), and sleeve is shield. To connect to

an unbalanced load connect the plugs tip

to high (+ or hot), and both the ring and

sleeve to shield. Whether this output is

wired via a patch bay will depend on the

specific installation.

Intercom Link Output

The ability to have IFB audio available on

an intercom system can be very useful for

smaller broadcast applications. But often

an intercom power supply or user station

with a line-level program input isnt avail-

able for injecting the signal into the

system. The intercom link output is de-

signed expressly to allow the Model 770s

IFB audio signal to be directly connected

to the bus of an intercom system. The

output is a current source with an imped-

ance of 10k ohms, is DC isolated, and has

a level optimized for RTS/Telex intercom

systems. (Note that RTS/Telex specifies

a nominal audio operating level of 0dBu,

but their equipment performs more like

10dBu nominal systems.)

It is important to understand that the

intercom link output is a current source,

rather than a voltage source. Most inter-

com systems, such as those from RTS/

Telex, utilize a 200 ohm intercom bus

impedance and expect devices that con-

nect to the bus to maintain a source

impedance of 10k ohms or higher.

Connecting a standard, low-impedance

output circuit directly to an intercom bus

will not provide an acceptable audio

feed. An additional problem is that the

output circuit may be damaged by the

DC that is present on the intercom bus.

The Model 770s intercom link output has

the correct characteristics to meet the

challengemaintaining the correct imped-

ance and being isolated from DC voltage.

The intercom link output is accessible via

a ¼-inch 3-conductor jack. Prepare the

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