StudioTech Annoucer's Console 233 Manual De Usuario

Descargar
Página de 47
Issue 1, September 2007 
Model 233 User Guide
Page 34 
Studio Technologies, Inc. 
to the connected headphones. The user 
can now, in response to changing condi-
tions, adjust the front-panel level controls 
as desired. Returning the controls to their 
detent positions will always provide the 
“reference” level to the headphone output.
A second example has the intercom input 
and line input 1 both providing cue sourc-
es. Pin 2 of the intercom circuit supplies 
program-with-interrupt audio that is routed 
to the headphone output’s left chan-
nel. Pin 3 of the intercom circuit supplies 
program-only audio that is routed to the 
right channel. Line input 1 is connected to 
an audio source associated with a sports-
event “spotter” position. This source is 
routed to the headphone output’s right 
channel. The input trim pot associated 
with line input 1 can now serve a critical 
role—adjusting the relative level of the 
“spotter” audio as compared to the level 
of intercom pin 3. The trim pot allows the 
desired “mix” to be created, providing the 
user with an effective cue signal.
Intercom Interface Sidetone 
Adjustment
Associated with the talkback-to-intercom 
functions are sidetone trim potentiometers 
that are used to adjust the talkback levels 
that are returned by way of the intercom 
line cue audio source circuitry. These two 
trim pots are part of the analog hybrid cir-
cuit that separates (nulls) talkback audio 
from receive (listen) audio. If audio from 
either or both of the intercom channels is 
to be used as a headphone source, and 
talkback to these intercom channels has 
been configured, the sidetone trim pots 
may need to be adjusted.
One trim pot is associated with the side- 
tone level for each channel of the inter-
com interface. Both are accessible on 
the bottom of the Model 233’s enclosure, 
adjacent to the trim pots associated with 
the line-level inputs. Adjusting them is very 
simple, requiring only a pair of ears and a 
screwdriver.
With the Model 233 configured as previ-
ously described, activate one of the talk-
back-to-intercom functions. Audio from 
the connected microphone may be heard 
in the configured headphone output 
channel(s). Adjust the trim pot associated 
with the active intercom channel so that 
the desired sidetone level, relative to the 
intercom receive level, is achieved. The 
adjustment range is approximately 18 dB, 
with the sidetone level increasing as the 
trim pot is rotated in its clockwise direc-
tion. Now change to the other intercom 
channel and adjust its sidetone trim pot 
as desired.
Using the Model 233’s sidetone func-
tion, talkback audio will be routed to the 
headphone outputs by means of active 
circuitry. If this is enabled be certain to 
place the two intercom sidetone trim pots 
to their fully counterclockwise positions. 
This will minimize the increase in sidetone 
level that will occur when both the main 
sidetone and the sidetone associated with 
talkback-to-intercom functions are active.
Technical Notes
Grounding and Shielding
As previously discussed in this user guide, 
the pin 1 connections on the 3-pin male 
XLR-type connectors associated with the 
main and line-level talkback outputs are 
“floating,” i.e., not connected to anything 
within the Model 233’s enclosure. Some 
audio experts might take offense to this, 
grousing that this should have been left