S B - 7 0 4 M A I N S T A T I O N
1 - 3
•
INTERNAL IFB
(IFB - Interrupt Foldback of program feeds):
Program feed can be fed to each channel and interrupted (IFB) when
a
talk
function is active or when a
call
signal is received on that
channel. An internal jumper determines whether the IFB function is
talk- or call signal- activated.
•
ASSIGNMENT MATRIX:
Up to ten stations or groups of stations
can be assigned to any one of the four intercom lines.
•
LINK FUNCTION:
The SB-704 has a
link
function that places all
four channels into a common party line at the single push of a button.
•
ALL-TALK:
An
all-talk
button allows instant access to all channels.
•
ANNOUNCE FUNCTION:
An
announce
button allows external
paging. A set of relay contacts is provided to control an external
system.
•
PROGRAM FEED OVER STAGE ANNOUNCE:
An internal
jumper allows the main program feed to be fed to the
stage announce
output. The program is automatically interrupted when the
announce
button is pressed.
•
MIC ON/OFF SWITCH:
A separate
mic on/off
push-button allows
turning the microphone off without upsetting the setting of
talk
switches.
•
REMOTE MIC KILL SWITCH
: Front-panel switch allows you to
turn off all latched talks on remote stations and beltpacks.
•
EXTERNAL MIC ON/OFF INPUT:
An external logic input allows
the
mic on/off
function to be switched remotely.
•
EXTERNAL IFB and HOT MIC OUTPUT:
A rear panel jack
provides direct connection to Clear-Com’s external IFB system such
that the station's microphone can be used in the external IFB system.
A buffered unswitched output of the selected microphone is also
available.
•
EXTERNAL SPEAKER OUTPUT:
The SB-704 does not have a
panel-mounted speaker; however, the speaker amplifier output is
made available on the rear panel.
•
SPEAKER ON/OFF SWITCH:
The speaker output may be turned
on and off with a front panel switch.
•
SPEAKER DIMMING:
Whenever a
talk
is active the
speaker
output is dimmed approximately 6 dB to prevent feedback.
•
PANEL MIC GAIN:
The preamplifier for the panel microphone has
a
gain trim
adjustment to allow field trimming. Adjustment of the
panel microphone gain also varies the frequency response of the
preamplifier to compensate for feedback when the microphone is
used up close.
•
POWER SUPPLY WITH SHORT CIRCUIT PROTECTION:
The SB-704 features redundant powering to remote stations by
Содержание SB-704
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Страница 34: ...S B 7 0 4 M A I N S T A T I O N 3 2 Figure 3 8 SB 704 Block Diagram...
