Rts BP320 User Manual
TECHNICAL
DATA PACKAGE
MODEL BP320
Portable Belt User Station
9300-3507-00
Rev
A
1/95
RTS
'"
(
/-
TABLE
)
PROPRI~ARYNOTICE
OF
CONTENTS
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ii
COPYRIGHTNOTICE
PATENT NOTICE ii
UNPACKING
RETURNSHIPPINGINSTRUCTIONS
SECTION 1; DESCRIPTION AND SPECIFICATIONS
1.2 HEADSET REQUIREMENTS
1.3 BP320 SPECIFICATIONS
SECTION
2.1 ELECTRICAL INSTALLATION / GROUNDING
2.2 ELECTRICAL INSTALLATION / POWER
2.3 ELECTRICAL INSTALLATION
2.4 ELECTRICAL INSTALLATION
AND
2:
INSTALLATION
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INSPECTION
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SIGNALS
1
CROSSTALK CONTROL
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ii
1-2
1-4
1-4
2-1
2-1
2-1
2-1
2-2
ii
ii
2.5 ELECTRICAL INSTALLATION
2.6 ELECTRICAL INSTALLATION
2.7 USER STATION CONNECTIONS
SECTION
3.1 OPERATING CONTROLS
SECTION
3:
OPERATION
4:
LIST OF' DRAWINGS
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MOISTURE / CONTAMINATION PROTECTION
HUM
PREVENTION
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2-2
2-2
2-2
3-1
3-1
4-1
Page
iii
SECTION
1.1
DESCRIPTION
1:
DESCRIPTION & SPECIFICATIONS
i-)
v
The Model BP320. a portable belt pack stereo user
is
station,
a component used in the
System. Each user station
is
a communications unit
TW
Intercom
along a multi-unit conference bus.
The System Concept Block Diagram, Figure
1-1,
illustrates a user station interconnection, and user
station connection to the system power supply. User
station interconnection can be:
1) Centrally wired, with each cable coming from a
central point or,
2) distributed, where all the user stations are
looped together from one to another, or
3) a combination of both.
The centrally wired interconnection not only reduces
interchannel crosstalk but also allows for easier
expansion into an assignable channel, multi-channel
system.
The BP320 Block Diagram, Figure 1-2, illustrates a
user station functional components, inputloutput
connections and controls.
The BP320 User Station has the following functional
components:
a microphone preamplifier with limiter,
an electronic microphone switch,
two electronic channel delegate switches
two "bilateral current source" line drivers,
two listen volume controls (dual concentric),
two headphone amplifiers,
a stereolmono switch and
a channel selectorltalk delgate switch.
The microphone preamplifierPimiter:
1)
converts the small microphone signal to a strong
line level signal,
2)
conditions the signal strength from loud and soft
talkers to be almost the same and
3) sends the signal to the line via the microphone
switch. The microphone switch transfers the
signal to the two electronic talk switches. These
two switches each drive a bilateral current source
for channels
1
and 2 respectively. A "bilateral
current source" adds signal to the line without
affecting any signals already
on
the line. The
channel selector switch selects on which
channel@) the user will talk and listen. The
BP320 has the capability to talk on either or both
channels without connecting the channels
together.
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Each "bilateral current source* also
extracts the listen signal from its line and sends it
to the respective headphone amplifier and
volume control. Some of the user's own voice
signal ("sidetone") is also fed to the headphone
amplifier. Each headphone amplifier output
drives the user's headphones. The monaural
fed
switch allows a combined signal to be
to each
of the headphone amplifiers so that a single
earphone can hear both channels.
The user station voltage regulator takes power
from channel
1
regardless of the channel selector
switch setting (exception: local power option
units). The regulator not only supplies regulated
power to the user station, but also prevents
unwanted interaction between the user station
and the intercom line supplying power. The
BP320 call light option works in a special way:
Thr transmitted call light signal follows the
channel delegate switch and may appear on
either or both channels. A call light signal on
either channels triggers the
BP320 call light
receiver.
The
BP320 User Station has four inputloutput
connectors:
1) DYNamic MICrophone type HeaDSeT or
handset.
2) Line INPUT (ties the station to the intercom
line.)
LOOPEXTension (allows another station to
3)
access the line through the first station), (also
called loop-through).
4)
Accessories/External Controls allows:
1)
Remote mic switch (or foot switch)
2) Local powering, and
3) Stereo program input.
Page 1-2
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