Clear-Com SB-704 Manual
CLEAR-COM ENCORE
SB-704
MAIN STATION
INSTRUCTION MANUAL
SB-704 Main Station Instruction Manual
© 2007 Vitec Group Communications
All Rights Reserved
Part Number 810346Z Rev. 2
Vitec Group Communications, LLC.
850 Marina Village Parkway
Alameda, CA 94501
U.S.A
Vitec Group Communications
7400 Beach Drive
Cambridge Research Park
Cambridgeshire
United Kingdom
CB25 9TP
Vitec Group Communications
Room 1806, Hua Bin Building
No. 8 Yong An Dong Li
Jian Guo Men Wai Ave
Chao Yang District
Beijing, P.R. China 100022
Clear-Com is a registered trademark of Vitec Group Communications.
The Clear-Com Logo is a registered trademark of Vitec Group Communications.
CONTENTS
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
The Clear-Com Concept. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Intercom Power Status Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Selecting Microphones and Enabling the Speaker . . . . . . . . . . . . . . . . . 1-4
Listening to Intercom Channels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Talking on Intercom Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
The All-Talk Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Monitoring Main Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Sending and Receiving Call Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Linking Intercom Channels Together . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
The Announce Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Channel Assignments Using the Slide Switch Matrix. . . . . . . . . . . . . . . 1-6
Remote Mic Kill Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Hidden Front Panel Options and Adjustments . . . . . . . . . . . . . . . . . . . . . 1-7
DIP Switch Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Hidden Adjustment Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Rear Panel Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Intercom Line Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Short-Circuit and Overload Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Summary of Main Front-Panel Keys, Lights, and Controls . . . . . . . . . . . 1-10
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Installation Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Intercom Line Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Line Termination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Using the Link Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Fail-Safe Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Intercom Cable Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Portable Installation Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Permanent Installation Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Ground Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Physical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Description of Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Headset Connector (Front Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Panel Mic Connector (Front Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Intercom Line Connectors (Rear Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Program Input (Rear Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Announce Output (Rear Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
IFB/HOT Mic (Rear Panel, 1/4-Inch Phone Jack). . . . . . . . . . . . . . . . . . . 2-8
External Speaker (Rear Panel, 1/4-Inch Phone Jack) . . . . . . . . . . . . . . . . . 2-8
SB-704 MAIN STATION
i
Accessory (Rear Panel, DB-15F) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Auxiliary Program Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Remote Mic On/Off Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Announce Relay Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Internal Option Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
IFB Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Run/Test Mode Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Program Audio Feed to Announce Output Jumper . . . . . . . . . . . . . . . . . 2-10
Power Source Selection for Switchable Intercom Lines. . . . . . . . . . . . . . . 2-11
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
SB-704 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
SB-704 Main Station. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
LIMITED WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-I
Warranty Period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-i
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-i
Warranty Repairs and Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii
Non-Warranty Repairs and Returns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii
Extended Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii
Service Contract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-iii
Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-iii
ii
SB-704 MAIN STATION
IMPORTANT SAFETY INSTRUCTIONS
1.
2.
3.
4.
5.
6.
7.
Please read and follow these
instructions before operating
this product.
8.
9.
10.
11.
12.
13.
14.
15.
Read these instructions.
Keep these instructions.
Heed all warnings.
Follow all instructions.
Do not use this apparatus near water.
Clean only with dry cloth.
Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.
Do not install near any heat sources such as radiators, heat registers, stoves,
or other apparatus (including amplifiers) that produce heat.
Do not defeat the safety purpose of the polarized or grounding-type plug. A
polarized plug has two blades, with one wider than the other. A
grounding-type plug has two blades and a third grounding prong. The wide
blade or the third prong are provided for your safety. If the provided plug
does not fit into your outlet, consult an electrician for replacement of the
obsolete outlet.
Protect the power cord from being walked on or pinched particularly at
plugs, convenience receptacles, and the point where they exit from the
apparatus.
Only use attachments/accessories specified by the manufacturer.
Use only with the cart, stand, tripod, bracket, or table specified by the
manufacturer, or sold with the apparatus. When a cart is used, use caution
when moving the cart/apparatus combination to avoid injury from tip-over.
Unplug this apparatus during lightning storms or when unused for long
periods of time.
Refer all servicing to qualified service personnel. Servicing is required when
the apparatus has been damaged in any way, such as power-supply cord or
plug is damaged, liquid has been spilled or objects have fallen into the
apparatus, the apparatus has been exposed to rain or moisture, does not
operate normally, or has been dropped.
WARNING: To reduce the risk of fire or electric shock, do not expose this
product to rain or moisture.
Please familiarize yourself with the safety symbols in Figure 1. When you see
these symbols on this product, they warn you of the potential danger of electric
shock if the main station is used improperly. They also refer you to important
operating and maintenance instructions in the manual.
SB-704 MAIN STATION
iii
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
This symbol alerts you to the presence of uninsulated dangerous
voltage within the product's enclosure that might be of sufficient
magnitude to constitute a risk of electric shock. Do not open
the product's case.
This symbol informs you that important operating and maintenance instructions are included in the literature accompanying
this product.
Figure 1: Safety Symbols
EMC AND SAFETY
The SB-704 station meets all relevant CE, FCC, UL, and CSA specifications
set out below:
EN55103-1 Electromagnetic compatibility. Product family standard for audio,
video, audio-visual, and entertainment lighting control apparatus for
professional use. Part 1: Emissions.
EN55103-2 Electromagnetic compatibility. Product family standard for audio,
video, audio-visual, and entertainment lighting control apparatus for
professional use. Part 2: Immunity.
UL 60065-7, CAN/CSA-C22.2 No.60065-3, IEC 60065-7 Safety
requirements.
And thereby compliance with the requirement of Electromagnetic
Compatibility Directive 2004/108/EC and Low Voltage Directive 2006/95/EC
This device complies with Part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
iv
SB-704 MAIN STATION
1
OPERATION
INTRODUCTION
Congratulations on choosing this Clear-Com product. Clear-Com was
established in 1968 and remains the market leader in providing intercoms for
entertainment, educational, broadcast and industrial applications. The
ruggedness and high build-quality of Clear-Com products defines the industry
standard. In fact, many of our original beltpacks and main stations are still in
daily use around the world.
We recommend that you read through this manual completely to better
understand the functions of the SB-704. If you encounter a situation or have a
question that this manual does not address, contact your dealer or call
Clear-Com directly. Our applications support and service people are standing by
to assist you. (Refer to Chapter 5,“Warranty” for contact information.) Thank
you for selecting Clear-Com for your communications needs.
THE CLEAR-COM CONCEPT
Clear-Com is a closed-circuit intercom system that consistently provides
high-clarity communication in high-noise and low-noise environments. A basic
system consists of a single- or multi-channel power supply or main station
connected to various single- or multi-channel remote stations, such as beltpacks
and loudspeaker stations.
Clear-Com manufactures a wide variety of both portable and fixed-installation
units. All are compatible with each other. Clear-Com intercom systems can also
interface with other communication systems and devices.
Clear-Com is a distributed amplifier system; each main and remote station
houses its own mic preamplifier, headset or speaker power amplifier, and
signaling circuitry. Stations bridge the intercom line at a very high impedance
and place a minimum load on the line. The audio level always remains constant,
and does not fluctuate as stations leave and join the network. Low-impedance
mic input lines and specially designed circuitry make Clear-Com channels
virtually immune to RFI and dimmer noise.
Clear-Com stations are interconnected with two-conductor, shielded
microphone cable. Portable stations are connected with two conductor cables
with 3-pin XLR connectors. One wire carries the DC power from a main station
or power supply to all remote stations, and the other wire carries 2-way (duplex)
audio information. The shield acts as a common ground. One termination (per
channel) is needed throughout the intercom network, and is usually located in
the main station or power supply.
Clear-Com main stations, power supplies, and certain remote stations each have
an auxiliary program input with its own volume control, which allows an
external audio source to be fed to the intercom system.
SB-704 MAIN STATION
1-1
Visual signal circuitry (call lights), a standard feature on all main and remote
stations, allows the user to attract the attention of operators who have removed
their headsets.
Channel A
Panel Mic
Channel B
Channel C
Channel D
Mic On
Listen
Listen
Listen
All Talk
Talk
Talk
Talk
Link On
Call
Call
Call
Announce
1
2
3
4
5
6
7
8
9
10
Volume
Headset
Off
A
B
On
Panel
Headset
Short
D
Speaker
Mic Select
Remote
Mic Kill
CH. A
CH. B
Sidetone
Adjust
Panel Mic
Gain
Party
Line
(Short)
(Off)
(Default)
CH. C
CH. D
C
Off
Long
On
HS B C D
ABC D
Lim Program Auto-Call
Interrupt
ABC D
Auto-Talk
/Listen
ABC D
Talk Latch
Disable
Program A B C D
Level Program
On/Off
Null
Listen Pgm
Channel A
Null
Listen Pgm
Channel B
Null
Listen Pgm
Channel C
Null
Listen Pgm
Channel D
ABC D
Line
Length
4 Channel Switchboard
Main Station
SB-704
Figure 1-1: SB-704 Front Panel
DESCRIPTION
The SB-704 main station is a four-channel microprocessor-controlled station
intended to work with other Clear-Com party-line products. The SB-704 is
designed for applications in which a person needs to communicate with up to
four groups of people and be able to quickly assign a remote station to any of the
four channels.
The station features a ten-position slide switch matrix that allows assignment of
any of the ten intercom lines to any of the four intercom channels, to an isolated
separate party line, or to an off position.
The following is a list of features found in the SB-704 intercom station:
1-2
•
MICROPROCESSOR CONTROL: Most aspects of station operation
are under microprocessor control.
•
REMOVABLE ACCESS PANEL: A removable front panel allows access
to most controls and option DIP switches.
•
INDIVIDUAL CHANNEL CONTROLS: Each channel has
individual talk, listen, and call push-buttons for each channel.
•
MOMENTARY/LATCHING TALK BUTTONS: The talk buttons
have a momentary and latching action depending on how the button is
used. The latching function can be defeated with DIP switches.
•
INDIVIDUAL CHANNEL ADJUSTMENTS: Each channel has
individual listen level controls, channel null adjustments, and program
feed level controls.
•
MULTIPLE PROGRAM INPUTS: Multiple program inputs are
provided for local station monitoring and program feed to intercom
lines for local talent cuing (IFB).
•
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.
SB-704 MAIN STATION
SB-704 MAIN STATION
•
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 providing
separate short-circuit-protected power sources to each of the four
intercom lines. A short on one intercom line will not bring the whole
system down. Short-circuit indicators are provided on the front panel for
each channel.
1-3
NORMAL OPERATION
Once installed and operational, the SB-704 is easy to operate. The following
sections describe normal operation of the unit, use of controls available under the
access panel, and abnormal operation of the power distribution system.
Normal operation of the SB-704 requires access only to the front-panel controls.
The following is a brief description of how to use the front-panel controls in
day-to-day operation.
There are option DIP switches and adjustment controls behind the access panel
on the lower portion of the front panel. To gain access to the switches and
controls, pull on the two latches on either end of the access panel and remove it.
This section discusses the following subjects:
•
Intercom power status lights
•
Selecting microphones and enabling the speaker
•
Listening to intercom channels
•
Monitoring main program
•
Talking on intercom channels
•
The all-talk function
•
Sending and receiving call signals
•
Linking intercom channels together
•
The announce function
•
Channel assignments using the slide switch matrix
Intercom Power Status Lights
The four red short lights are failure indicators for each of the four intercom lines.
These lights will assist in locating a shorted or overloaded channel. Within as
little as ½ second of automatically cutting off power to an overloaded intercom
line, the SB-704 will attempt to turn power on again. This allows momentary
short or overload conditions to clear automatically. Shorts are normally caused by
miswiring or damaged cables. Overloads are generally caused by connecting too
many beltpacks and stations to an intercom line.
Clear-Com’s advanced fail-safe design can sense the difference between a short or
an overload to optimally protect itself. Power is restored in as quickly as ½
second, depending upon whether there was a single or multiple short or overload.
The other channels continue to operate normally. The SB-704’s advanced
fail-safe circuit will bring the power back up even under full load conditions.
Front-panel lights indicate a fault on any of the four channels. When the station
is first turned on, all four short lights are normally off.
Selecting Microphones and Enabling the Speaker
To select between the gooseneck mic and the headset mic, move the microphone
select switch to the appropriate position.
1-4
SB-704 MAIN STATION
The mic on/off pushbutton toggles the microphone on and off. The mic button
lights blue when the mic is active.
The microphone will be turned on automatically whenever a talk function is
activated as it is assumed that you wish to talk. If one or more talks are active, you
may turn the microphone off without unlatching the active talks.
The speaker may be turned on and off with the speaker switch.
Listening to Intercom Channels
To listen to an intercom channel, press the listen button for the desired channel.
The listen button lights green to indicate that the listen function is on.
The listen level control (below the call button) for that channel is usually set to
full on position and the listening volume is set by the intercom volume control to
the left of the speaker.
If several channels are being listened to at the same time, it might be desirable to
adjust the individual listen levels of each channel for the desired mix.
Talking on Intercom Channels
To talk on an intercom channel, press the desired talk button. Pressing and
holding the button will cause the function to be active only while the button is
held (momentary). Pressing and releasing the button quickly will cause the
function to latch on if it was off or turn off if it was on (latching).
The latching function can be defeated on an individual channel with an option
DIP switch beneath the access panel (latch disable DIP switch).
The button will be illuminated blue when the talk function is off and amber
when the talk function is on.
Another option allows the automatic setting of a listen function whenever a talk
is active (auto-listen DIP switch) for each channel.
The All-Talk Function
Pressing the button marked all talk sends the selected microphone to all channels
while the button is pressed (momentary only). This button lights amber when
pressed.
Monitoring Main Program
The main program input is the one on the XLR connector on the rear panel. To
listen to the main program in the speaker or headphone, adjust the program level
control just below the link and all talk pushbuttons.
Sending and Receiving Call Signals
To send a call signal on an intercom channel press the call button for that
channel. This is a momentary function.
If the auto-call option is selected for that channel, activating a talk button will
also send a call to that channel.
SB-704 MAIN STATION
1-5
Receiving a call signal is indicated by a flashing red call button.
Linking Intercom Channels Together
A pushbutton allows the connecting of intercom channels B, C, and D to
channel A. The link pushbutton is latching in action. The link button
illuminates amber when all channels are linked together. In the latched position,
the entire station operates as one party line.
Talk and listen buttons are non-functional on channels B, C, and D when they
are linked to channel A.
The Announce Function
A single pushbutton sends the active microphone’s audio to the announce output
on the rear panel. Any active talks are disabled while the announce button is
held. The announce button illuminates amber when held. Talk and listen latches
are not reset, but the microphone’s audio does not go to the intercom line while
the announce function is active. A set of relay contacts are activated to control
some external device.
There is an option which allows program audio to be fed to the announce output.
If this option is enabled, the announce pushbutton interrupts this audio when it
is pressed. Program audio feed to the announce output is selected by setting
jumper J11 on the main board to the on position.
Channel Assignments Using the Slide Switch Matrix
The ten assignment switches let you assign the switchboard destinations (#1 - #10
on the rear panel) to any of the four main intercom channels (A, B, C, or D), an
isolated off channel, or a separate common party line just for these inputs.
When the switchboard destinations are assigned to the off position, they are
isolated from all other switchboard destinations and isolated from the four main
intercom channels. Stations on one of these lines can only talk to each other. A
call signal on one of these lines will be indicated by the amber LED above the
particular matrix switch. Pressing the all talk button on the station will send the
microphone to the channel in the off position.
When the switchboard destinations are assigned to the party-line position, all
destinations that are placed in the party-line position will be connected into a
common party line isolated from the rest of the station. Pressing the all talk
button on the station will send the microphone to all channels in the party-line
position.
Remote Mic Kill Function
When you press the remote mic kill pushbutton, the talk function shuts off for
every beltpack on all four channels. If the talk functions of a large number of
beltpacks have inadvertently been left activated, incidental noise and talking can
make it difficult or impossible to communicate on the party line intercom. The
remote mic kill button can be pressed to quiet the line in this situation. Those
needing to communicate can then set their talk functions to on as needed.
1-6
SB-704 MAIN STATION
Note:
The remote mic kill button only functions if the SB-704 main station is
powering all of the stations in the system. Pressing the button
momentarily interrupts power to the other beltpacks and stations in the
system. If there are other power supplies or main stations in the system,
then the remote mic kill switch cannot interrupt power and therefore
cannot work.
HIDDEN FRONT PANEL OPTIONS AND ADJUSTMENTS
This section describes the option DIP switches and various adjustment controls
behind the access panel on the front panel. These option switches and controls
are usually set and not used in daily operation of the unit.
To gain access to these controls, pull on the two latches on either end of the
access panel and remove it.
DIP Switch Options
The unit is shipped with all DIP switches, except the Headset Audio Limiter
switch, in their default positions (up). The Headset Audio Limiter switch is
shipped in the down (on) position.
The following functions are enabled with DIP switches:
•
HEADSET AUDIO LIMITER: The HS dip switch turns the headset audio
limiter on or off. Unless an especially high volume is needed, this switch
should be left in the on position to protect the hearing of the user.
•
INTERRUPT ENABLE: Three DIP switches enable the program interrupt
function on channels B, C, and D. Program interrupt is not available on
channel A.
•
AUTO-CALL: Four DIP switches (one for each channel) enable
automatically sending a call signal whenever a talk is active on the enabled
channel.
•
AUTO-TALK/LISTEN: Four DIP switches (one for each channel) enable
automatically setting the listen function whenever a talk is active on the
enabled channel.
•
TALK LATCH DISABLE: Four DIP switches (one for each channel) disable
the latching action of the selected channel.
•
PROGRAM ON/OFF: Four DIP switches (one for each channel) enable
feeding the main program input to the selected intercom channel. The main
program input is the one on the XLR-3F on the rear panel.
The other four program inputs in the auxiliary connector feed their respective intercom channels all of the time. The only way to turn off the auxiliary
feed to a channel is to turn its individual control off.
SB-704 MAIN STATION
1-7
•
LINE LENGTH: Four DIP switches (one for each channel) allow the
optimization of the nulling circuitry for each channel. The default (up
position) is for lines less than 400 ft. (122 m). The down position is for lines
greater than 400 ft. (122 m).
Hidden Adjustment Controls
Various adjustments are available beneath the front access panel.
•
PANEL MIC GAIN: This control trims the panel microphone preamplifier
gain to compensate for different uses of the station.
The unit is shipped from the factory in the minimum gain position (fully
counter-clockwise). This level matches the headset microphone level when
the panel microphone is worked up close. Raising the gain from the factory
setting should be done carefully as too much gain will increase the background noise in the intercom making it unusable.
•
CHANNEL NULL ADJUST: The screwdriver-adjustable control beneath
each talk push-button marked null allows nulling of the hybrid circuitry
associated with each listen channel.
The amount of null in the listen circuitry varies with the length of the intercom line. Adding or removing stations and intercom cable will change the
null. For optimum performance, the null control will need to be adjusted
each time there is some change in the intercom line wiring.
If a panel microphone and speaker is being used, the setting of the null control is critical to prevent feedback.
To adjust the null control on a given channel:
1. Turn the sidetone adjust control just below the headset connector to
minimum.
2. Set a talk to the channel to be adjusted or send some program to the
channel and adjust the null control for the channel for minimum level in
the headphone. If the headset microphone is being used, hum or gently
scratch it for a continuous signal source to null on. If a good null is not
attainable, switch the long/short DIP switch for the channel (to the far
right of the hidden adjustments) to its opposite setting. Use the setting
that produces the best results.
3. Repeat the adjustment for all four channels on the station.
4. Adjust the sidetone adjust control for the desired amount of sidetone in
the headset.
•
CHANNEL PROGRAM FEED LEVEL: Beside the null control for each
channel there is a control marked PGM which adjusts the amount of
program being sent to that channel.
Each channel has two program sources:
1. The main program that is input from the rear-panel XLR connector may
be enabled for a given channel with the program on/off DIP switches for
the channel.
1-8
SB-704 MAIN STATION
2. The auxiliary input connector has four individual program inputs for
each channel. These inputs cannot be disabled with front-panel DIP
switches.
REAR PANEL OPTIONS
This section describes the switches on the rear panel. These switches and controls
are usually set and not used in daily operation of the unit.
Intercom Line Termination
The SB-704 has switch-selectable intercom-line termination networks. If more
than one SB-704 (or any other Master Station) is installed on the same intercom
lines then all of the terminations in all of the stations except one must be
disabled.
Note: If the link function is to be used on an SB-704 and there is more than one
main station in the system, it can only be used on the unit that provides
termination.
The terminations are enabled or disabled with switches on the rear panel. Each
channel is marked clearly on the panel. Set the switches to the off position to
disable the terminations in the station. The SB-704 is shipped from the factory
with all four lines terminated.
SHORT-CIRCUIT AND OVERLOAD CONDITIONS
If a short-circuit condition appears on any of the four intercom lines, the sense
circuitry for that line will disconnect the DC power to that line only and the red
“short” light for that channel will be on. After approximately 0.5 seconds, the
SB-704 will attempt to turn power on again. This allows momentary short or
overload conditions to clear automatically.
If the red “short” light remains after repeated automatic or manual attempts to
restore power, then there is either a short on that intercom line or too many
intercom stations have been connected to that intercom line. In this case, unplug
the intercom line connected to the affected channel and its red “short” light
should go out. This indicates that there is short in that line. Follow that intercom
line and break it apart in several places while it is plugged into the station to
isolate the section of line that is shorted.
SB-704 MAIN STATION
1-9
SUMMARY OF MAIN FRONT-PANEL KEYS, LIGHTS, AND CONTROLS
Table 1 summarizes the meaning of various front-panel keys, lights, and controls.
Function
“On” State
“Off” State
Momentary or Latching
Microphone Key
(activates selected microphone,
either panel or headset)
Blue
Off
Latching only (activates automatically
when other keys such as Talk,
Announce, All Talk are pressed)
Listen Key (press to listen to a
channel)
Green
Off
Latching only (can be set to activate
automatically with “talk”)
Talk /Power-On Key (press to
talk on a channel)
Amber
Blue (indicates that
the station is
receiving power, but
the “talk’ feature is
off )
Both
Call Key (press to send a call
signal on a channel)
Red
(flashing)
when
receiving or
sending call
signal)
Off
Momentary only
Announce Key (press to send
microphone’s audio to
“announce” output, i.e. PA
system)
Amber
Off
Momentary only
All-Talk Key (press to send
microphone’s audio to all
channels)
Amber
Off
Momentary only
Link-On Key (press to link all
channels together so that station
operates as one party line)
Amber
Off
Latching only
Remote Microphone Kill Key
(press to clear all latched talks on
connected remote
stations/beltpacks on all
channels)
Amber
Off
Momentary only
Short/Overload Light (lights
when there is a short or overload
on the associated channel)
Red
Off
Neither
Mic Select Switch (to select to
activate either the panel or
headset microphone)
n/a
n/a
n/a
1-10
SB-704 MAIN STATION
Function (Continued)
“On” State
“Off” State
Momentary or Latching
Speaker On/Off Switch (to
switch station speaker on or off )
n/a
n/a
n/a
Volume Knob (adjusts overall
incoming volume on all channels)
n/a
n/a
n/a
Listen Level Knob (adjusts
incoming volume to selected
channel only)
n/a
n/a
n/a
Channel Slide Switch (assigns
each of 10 individual stations to
one of four channels)
n/a
n/a
n/a
Channel Light (shows if there is a
call signal on a channel)
amber
off
n/a
Note: To “latch” (or “lock”) a button to “on,” quickly press it once. The button is
“locked” to “on” for hands-free use. Pressing the button again releases the
latch. Otherwise when you press and hold a button the feature switches on,
and when you release the button the feature switches off. This is called
“momentary” use.
SB-704 MAIN STATION
1-11
1-12
SB-704 MAIN STATION
2
INSTALLATION
This chapter describes installation of the SB-704 in an intercom system.
INSTALLATION OVERVIEW
This section describes the Clear-Com concept in intercom line interconnection
under the following topics:
•
Intercom Line Connection
•
Line Termination
•
Station Powering
•
Cable Considerations
INTERCOM LINE CONNECTION
The SB-704 provides one male XLR-3 connector for each main intercom line
and ten male XLR-3 connectors for the separate assignable intercom channels.
LINE TERMINATION
The fundamental concept of the Clear-Com party-line intercom is that all
stations provide high impedance into a single system termination.
Note: An intercom line must be terminated. Care must be taken not to “double”
terminate a line. All unused intercom inputs must be terminated to keep
the line drive circuits stable.
The SB-704 provides switchable terminations of the intercom lines. Clear-Com
main stations and power supplies provide switch-selectable termination networks
on all intercom output lines. It is up to the user to determine where the
termination will be provided. An unterminated line will cause excessive levels,
possible oscillation of line drivers, and severe imbalance of hybrid null networks.
A double- or multiple-terminated line will cause low levels and severe imbalance
of hybrid null circuits.
Switching of the termination on and off on the SB-704 is with back-panel
switches. The SB-704 is shipped from the factory with all four lines terminated.
USING THE LINK FUNCTION
The link function in the SB-704 uses relays to connect the four party lines
together. In doing so, it also removes the terminations from channels B, C, and D
such that the new party line on channel A has only one termination when link is
activated. If there is more than one SB-704 or MS-704 in a system, the link
function can only be used at the station where the terminations are set on.
SB-704 MAIN STATION
2-1
FAIL-SAFE POWER
An intercom power supply has special needs that are not met by traditionally
designed power supplies. An intercom power supply must work in adverse
conditions such as low AC line voltage, momentary shorts on the DC power
lines to the stations, and excessive peak loads during “power-on”conditions. The
following features are incorporated into the SB-704’s power supply:
•
AUTOMATIC SHORT CIRCUIT PROTECTION: The SB-704’s
internal power supply checks each channel for a short or current overload. If
it detects a short the power supply will shut down that channel. A short
duration short circuit will not cause the power supply to interrupt power.
•
AUTOMATIC OVERLOAD PROTECTION: The SB-704’s internal
power supply senses the difference between shorts and overloads. If an
overload is detected the power supply will shut down that channel. An
overload lasting a short period will not cause the power supply to interrupt
power.
•
AUTOMATIC POWER RESTORE: The SB-704’s internal power supply
senses the difference between short-term and long-term shorts and overload
conditions. After the first few times a short or overload occurs, the power
supply will try to restore power after only 0.5 seconds. If the short or
overload persists or occurs repeatedly, the power supply will take
progressively longer (to a maximum of 20 seconds) to try to restore power.
This protects the power supply from damage due to overheating. Once the
short is removed, the channel will recover, even under a full load condition.
The automatic power restore times are shown in the following chart:
20
20
14
15
Numberof
secondsto
restore
10
7
5
4
2
0.5
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Numberofrecentshortsoroverloads
Figure 2-2: Automatic Power Restore Times
•
2-2
INDIVIDUAL CHANNEL SHORT CIRCUIT PROTECTION: Each
individual channel is separately overload and short circuit protected and may
draw as much as 1.2 amperes, though the total to both channels is limited to
SB-704 MAIN STATION
2 amperes. A short on any one intercom line will not bring the whole system
down.
Note: Power supply lines connected together at remote stations will disable
the individual channel short circuit protection feature.
•
FRONT PANEL “SHORT” LIGHTS: There are four short lights on the
front panel (one for each channel). The short lights illuminate steadily when
an overload or short condition is detected. They blink if power to a channel
has been shut off as a result of an overload or short.
•
PARALLELING MULTIPLE POWER SUPPLIES: Multiple power
supplies can be paralleled to increase system capacity. The SB-704’s internal
power supply will automatically detect the actions of other power supplies
during overloads and short circuits to restore power as quickly as possible.
•
LOW NOISE CIRCUITRY: The direct current outputs of the SB-704’s
internal power supply contain very little hum and noise. The power supply
does not contribute to audible noise in the remote stations and beltpacks.
•
CONNECTION TO AC MAINS: The AC power line supplies power to
the SB-704’s internal power supply. The power supply will accept any line
voltage between 100 and 240 VAC at 50-60 Hz. It will automatically adjust
to the line voltage. There is no need for a voltage selector switch or an
external fuse. The unit draws a maximum of 60 VA of power from the AC
line. Clear-Com power supplies can be paralleled to increase the number of
remote stations that can be operated in a system.
SB-704
RM-704
Remote
Station
Figure 2-3: Fail Safe Power Distribution
The illustration above shows the proper power wiring of a system powered by a
single SB-704. The single-channel remote stations are connected to the ten
SB-704 MAIN STATION
2-3
switched intercom connectors. These connectors derive their DC power
internally from the SB-704. The station comes set from the factory with the
power on the assigned lines #1 - #5 connected to channel A's power. The power
for channels #6 - #10 is sourced from channel B. Multiple-channel remote
stations are connected to the four intercom channels. In the case above, a short
on any one line will only take that channel down.
It is assumed that none of the power lines are interconnected in the external
system wiring. However, if a multiple-channel remote station that has not been
equipped for power line isolation is connected, those channels would now have
their power lines connected. The system will still work except that a short circuit
on any of the interconnected channels will cause both to fail thus taking more of
the system down with a single short circuit.
INTERCOM CABLE CONSIDERATIONS
The Clear-Com intercom line is intended to run on shielded-pair cable. One
conductor carries audio, the other conductor carries the DC power for remote
stations. The shield is used for ground return for audio and power. When
choosing interconnect cable, keep the following considerations in mind:
1. DC resistance of the ground or common conductor affects crosstalk. For
runs longer than 500 ft. (152.5 m) do not use wire smaller than 20 gauge.
2. The capacitance of the interconnect cable affects system frequency response
and sidetone stability. Total capacitance should not be greater than 0.25 uF.
Portable Installation Cable
Practical cable for portable system interconnections is flexible, two-conductor,
shielded microphone cable. We suggest you use Belden #1800F (24 gauge). For
runs longer than 500 ft. (152.5 m) use a 20 gauge cable or larger (Belden #8412).
Permanent Installation Cable
Vinyl-jacketed shielded pair is the cable of choice for permanent installations.
Use a low-capacitance 20 gauge wire for runs under 500 ft. (152.5 m). We
suggest you use Belden #8762. For runs longer than 500 ft. (152.5 m) use an 18
gauge cable (Belden #8760). Placing the cable in conduit is recommended but
not necessary.
Multi-pair cable that is individually shielded is acceptable for use in
multi-channel systems. For cross-talk considerations, the shields must be tied
together on both ends of the cable to produce the lowest possible DC path for
ground return.
WIRING DIAGRAM
The diagram shows using a multi-pair cable to connect two stations. Note that
the power and shield wires of each channel are not connected together.
2-4
SB-704 MAIN STATION
GROUND ISOLATION
The pin #1 ground connection of each XLR connector must also be isolated
from the chassis. Pin #1 should not be connected to the shell of the XLR
connector.
Figure 2-4: Interconnect Cable Detail
Note:
SB-704 MAIN STATION
The remote stations connected to each channel are powered from the
intercom cable for that channel. In the case above, a short on any one
line will only take that channel down.
2-5
CHANNEL A
CHANNEL B
PROGRAM IN
CHANNEL D
ANNOUNCE OUT
AUX
HOT MIC/IFB
RM-704
CHANNEL C
ss 2 Wiring
RM-704
On
On
Off
1
2
3
4
5
Off
CHANNEL A
PROGRAM IN
CHANNEL B
On
WARNING:
SB-704
TO PREVENT
FIRE OR SHOCK HAZARD DO NOT
EXPOSE THIS EQUIPMENT TO RAIN
OR MOISTURE.
EXTERNAL
SPEAKER
HOT MIC/IFB
AUX
Off
CAUTION:
TO PREVENT
ELECTRIC SHOCK DO NOT
REMOVE COVER. NO USER
SERVICEABLE PARTS INSIDE.
REFER TO QUALIFIED SERVICE
PERSONNEL.
9
10
CHANNEL C
CHANNEL D
ANNOUNCE OUT
utput: 30V, 1.2A Continuous, 2A Pe
SB-704
RS-601 BELTPACKS
Figure 2-5: Typical Mixed System Wiring
PHYSICAL INSTALLATION
You can install the SB-704 in a standard equipment rack, or you can use it as
stand-alone unit sitting on a table or desk. For installing in an equipment rack,
the unit requires 3.5 in. (8.89 cm or 2RU) of rack space. The stations are10.5 in.
(26.67 cm) in depth and require at least 2.5 in. (6.35 cm) clearance in the rear to
clear connectors and cables.
DESCRIPTION OF CONNECTORS
HEADSET CONNECTOR (FRONT PANEL)
Note: The following is a description of a recommended headset.
Mic Type --- Dynamic, see technical specifications for details
Wiring:
Pin 1 --- Mic common
Pin 2 --- Mic hot
Pin 3 --- Headphone common
Pin 4 --- Headphone hot
Note: Do not tie pin #1 and pin #3 together.
PANEL MIC CONNECTOR (FRONT PANEL)
Two plug-in panel microphones are available for use on the SB-704. The GM-9
is 9 in. (23.04 cm) long and GM-18 is 18 in. (46.08 cm) long. The microphone
2-6
SB-704 MAIN STATION
is of the electret type. The microphone has a built-in 0.25-in. (0.64 cm) phone
jack for a connector. A proprietary mating receptacle is mounted on the station.
To install a GM-9 or GM-18 panel mount microphone:
1. Check the set screw in the mic mounting flange to make sure it is clear of the
threads in the bushing.
2. Screw the microphone into the bushing hand tight.
3. If desired, set the set screw on top of the bushing to lock the mic in place.
INTERCOM LINE CONNECTORS (REAR PANEL)
The SB-704 has a single male XLR-3 connector for each intercom line. The ten
switched intercom lines also have male XLR-3 connectors. The pinout of the
intercom connectors is as follows:
Pin 1 --- Ground (Shield)
Pin 2 --- Power
Pin 3 --- Audio
PROGRAM INPUT (REAR PANEL)
A XLR-3F connector provides the main program input to the station. This input
is fed to the front panel program level control for listening in the headphones or
speaker and optionally it can be fed to each of the intercom lines with the option
DIP switches marked program select A-D. Another option is to feed program
audio to the announce output. This is selected by setting jumper J11 on the main
board to the on position.
Separate program inputs are also available for each channel via the accessory
DB-15 connector. Refer to the section on that connector for details. The pinout
of the program input connector is as follows:
Pin 1 --- Ground (Shield)
Pin 2 --- - Signal
Pin 3 --- + Signal
ANNOUNCE OUTPUT (REAR PANEL)
A XLR-3M connector provides the announce output from the station. Whenever
the announce button on the front panel is pressed, the selected microphone is
sent to the announce output and the announce relay is activated. Simultaneously,
if the program audio feed to the announce output is enabled, it is interrupted by
the announcement. Program audio feed to the announce output is selected by
setting jumper J11 on the main board to the on position. Refer to the section on
the accessory connector for instructions on connecting to the relay contacts.
The pinout of the announce output connector is as follows:
Pin 1 --- Ground (Shield)
Pin 2 --- - Signal
SB-704 MAIN STATION
2-7
Pin 3 --- + Signal
The signal level is 0 dBu and transformer isolated.
IFB/HOT MIC (REAR PANEL, 1/4-INCH PHONE JACK)
A ¼ in. (0.64 cm) phone jack marked IFB/hot Mic provides an output signal
from the selected microphone. This output is also intended to work with
Clear-Com’s IFB system. Consult the factory for installation instructions.
The jack connections are as follows:
Tip --- Hot mic output
Ring --- Control signal in
Sleeve --- Ground
EXTERNAL SPEAKER (REAR PANEL, 1/4-INCH PHONE JACK)
A ¼ in. (0.64 cm) phone jack marked external speaker provides the power
amplifier output of the station intended for driving an external speaker. The jack
connections are as follows:
Tip --- Speaker amplifier output
Ring --- No connection
Sleeve --- Ground
ACCESSORY (REAR PANEL, DB-15F)
The accessory DB-15F connector on the rear panel provides auxiliary program
inputs for each channel, remote mic on/off input, line level output, and announce
relay contacts. The pin assignments of the connector are as follows:
2-8
SB-704 MAIN STATION
Figure 2-6: Accessory Connector DB-15F - Rear View
Auxiliary Program Inputs
Four different program inputs, one for each channel, are provided. These
auxiliary program inputs can only be fed directly to their associated intercom
line. The only controls that affect these inputs are the PGM level controls
associated with each channel and the internal program interrupt switch which is
active if the function has been activated with an option DIP switch and a talk is
active on that channel.
Refer to the illustration for connection of the program inputs. Pins #5 or #14 can
be used for connecting shields.
Remote Mic On/Off Switch
An external momentary pushbutton switch connected to pins #5 and #13 will
duplicate the action of the front panel mic on/off switch.
Announce Relay Contacts
A relay is provided that activates when the announce button is pressed and its
contacts are available on the accessory connector. The relay contacts are rated for
2.0 amps of DC current at 24 VDC and are electrically isolated from the rest of
the station.
SB-704 MAIN STATION
2-9
INTERNAL OPTION JUMPERS
There are several jumper options inside the chassis of the SB-704. To access these
options remove the top cover of the unit.
Note: Remove AC power from the unit before removing the top cover.
Note: This adjustment should only be carried out by qualified service personnel.
The following options are available:
•
IFB Operation Mode Select
•
Run/Test Mode Jumper
•
Power source selection for switchable intercom lines
•
Program Audio Feed to Announce Output
IFB MODE
The SB-704 supports two different modes of operation for the internally
generated IFB function. J10 on the main PC board (in the lower left hand corner
of the board just behind the DIP switches) selects this mode. If an interrupt
enable DIP switch is enabled for a channel, the operation will be as follows:
• LOCAL (Talk Function Activated): Jumper between Pins #1 and #2, factory
default. When a talk is active on the channel on which the interrupt has been
enabled, the program will be interrupted for the duration of the talk.
• REMOTE (Call Signal Activated): Jumper between pins #2 and #3. When a
call is received on the channel on which the interrupt has been enabled, the
program will be interrupted for the duration of the call signal on that channel. To
cause an interrupt of the program from this station a call signal must be sent by
pressing the call button or enabling the auto-call DIP switch option for that
channel and activating a talk on that channel.
RUN/TEST MODE JUMPER
The J2 jumper on the main printed circuit board allow a factory test mode to be
invoked and should never be used for normal intercom operation.
CAUTION: Do not move these jumpers. Moving these test jumpers may cause the
SB-704 not to operate. Possible damage to the product may result.
PROGRAM AUDIO FEED TO ANNOUNCE OUTPUT JUMPER
J11 on the main board allows program audio to be fed to the announce output.
This is selected by setting jumper J11 to the on position. In this mode, pressing
the announce pushbutton turns off the program audio feed to the announce
output and replaces it with audio from the selected panel or headset microphone.
The factory default position for J11 is in the off position, blocking program
audio feed from the announce output.
2-10
SB-704 MAIN STATION
POWER SOURCE SELECTION FOR SWITCHABLE INTERCOM LINES
The power pins (pin #2) of the ten switchable intercom connectors are
connected together in two groups of five. Internal jumpers on the rear-panel
PCB board allow the selection of the source of power for each of these groups.
Either of the groups can be powered from channels A, B, C, or D's power feed to
the main intercom lines.
As shipped from the factory, the first five (channels #1 - #5) are powered from
channel A's power and the second five (channels #6 - #10) are powered from
channel B’s power.
A jumper field in the middle upper portion of the rear panel printed wiring
board has been provided for changing the power source of the switchable
intercom lines.
To change the factory default setting, refer to the illustration below.
POWER DIST.
A
B
C
D
CH 1-5
CH 6-10
CUT THESE
TRACES
SOLDER THESE
JUMPERS
Figure 2-7: Jumper Fields
If the first bank (channels #1 - #5) are to be changed, cut the PCB trace (between
the top pad marked A and the center pad just below it) with a knife or scraping
tool, then solder a wire jumper between one of the top pads marked A, B, C, or D
to the pad just below it (depending on which channel the power is to come
from).
If the second bank (channels #6 - #10) are to be changed, cut the PCB trace
(between the bottom pad marked B and the center pad just above it) with a knife
or scraping tool, then solder a wire jumper between one of the bottom pads
marked A, B, C, or D to the pad just above it (depending on which channel the
power is to come from).
SB-704 MAIN STATION
2-11
2-12
SB-704 MAIN STATION
3
MAINTENANCE
INTRODUCTION
This chapter provides maintenance information, including a block diagram and troubleshooting tips.
Caution: These servicing instructions are for use by qualified personnel only. To reduce the risk of electrical shock, do not
perform any servicing other than that contained in the operating instructions unless you are qualified to do so.
SB-704 BLOCK DIAGRAM
Figure 3-8: SB-704 Block Diagram
SB-704 MAIN STATION
3-1
3-2
SB-704 MAIN STATION
4
TECHNICAL SPECIFICATIONS
SB-704 MAIN STATION
dBu is an absolute measurement. 0 dBu is referenced to 0.775 volts RMS
Panel Microphone Input
Input Type
Input Impedance
Mic Limiter Threshold
Mic Limiter Range
Headset Microphone Input
Input Type
Input Impedance
Mic Limiter Threshold
Mic Limiter Range
Program Line Input
Maximum Level before Clipping
Input Impedance
Headset Output
Load Impedance
Output Impedance
Output Limiter Threshold
Maximum Output Level before Distortion
Speaker Output
Load Impedance
Max Output Level before 1% Distortion
Party Line Output
Off Noise
Output Impedance
Party Line Input
Crosstalk
Max level before Clipping
Sidetone Null Capability
Stage Announce/Balanced Line Out
Type
Output Impedance
Load Impedance
SB-704 MAIN STATION
Electret
>=2KΩ
0dBu ±3dB
>= 15dB
Dynamic
>= 1KΩ
0dBu ± 3dB
>= 15dB
>= 20dBu
>= 5KΩ
>= 8Ω
<= 25Ω
+5dBu ± 3dB
>= 17dBu
>= 4Ω
20dBu ± 2dBu
< -74dBu
>10KΩ
< -60dB
>= 12dBu
> 25dB
Balanced
>= 200Ω
>= 600Ω
4-1
IFB/Hot Mic
Type
Output Impedance
Load Impedance
Frequency Response
Panel Mic - Party Line
Headset Mic - Party Line
Headset Mic - Line Out
Program Input - Party Line
Program Input - Headset Out
Program Input - Speaker Out
Party Line - Headset Out
Party Line - Speaker Out
Max Distortion
Panel Mic - Party Line
Headset Mic - Party Line
Headset Mic - Line Out
Program Input - Party Line
Program Input - Headset Out
Program Input - Speaker Out
Party Line - Headset Out
Party Line - Speaker Out
Noise
Panel Mic - Party Line
Headset Mic - Party Line
Headset Mic - Line Out
Program Input - Party Line
Program Input - Headset Out
Program Input - Speaker Out
Party Line - Headset Out
Party Line - Speaker Out
Max Gain
Panel Mic - Party Line
Headset Mic - Party Line
Headset Mic - Hot Mic Out
Headset Mic - Announce Out
Program Input - Party Line
Program Input - Headset Out
Program Input - Speaker Out
Party Line - Headset Out
Party Line - Speaker Out
Min Gain
Panel Mic - Party Line
4-2
Unbalanced
150Ω
>= 600Ω
600 - 10KHz ± 3dB
200 - 12KHz ± 3dB
200 - 12KHz ± 3dB
100 - 17KHz ± 3dB
200 - 10KHz ± 3dB
300 - 10KHz ± 3dB
200 - 10KHz ± 3dB
300 - 10KHz ± 3dB
<= 0.5%
<= 0.5%
<= 0.5%
<= 0.2%
<= 0.2%
<= 0.5%
<= 0.2%
<= 0.5%
< -65dBu
< -70dBu
< -55dBu
< -85dBu
< -60dBu
< -60dBu
< -50dBu
< -50dBu
>= 37dB
41dB ± 2dB
55dB ± 3dB
55dB ± 3dB
>= -16dB
>= 18dB
>= 24dB
>= 34dB
>= 40dB
<= 25dB
SB-704 MAIN STATION
Mains Power
Input Voltage Range
Input Frequency Range
Input Power
Output Voltage
Output Current per Channel (Continuous)
Output Current per Channel (Peak)
100 - 240 VAC
50 - 60 Hz
<= 60 VAC
30 VDC ± 0.5V
1.2 A
2 A (Do not exceed the 1.2A rating
for more than 2 seconds per 1
minute period)
Short Circuit Recovery Time (1st short)
<= 0.5 sec
Short Circuit Recovery Time >= 20 shorts in 20sec) <= 20 sec
Station Capacity
Rear Panel Connectors
Switched Intercom:
Intercom
Announce Out:
Program: In
Hot Mic / IFB Interface:
External Speaker
Accessory
AC Power:
Rear Panel Controls
Front Panel Connectors
Panel Mic:
Headset:
Front Panel Controls & Indicators
SB-704 MAIN STATION
Up to 40 RS-601 beltpacks or 10
speaker stations or 12 headset
stations distributed over all
channels
(10) XLR-3M (1 per channel)
(4) XLR-3M (1 per channel)
(1) XLR-3M (audio)
(1) XLR-3F
(1) 1/4 in. (0.64 cm) phone jack
(1) 1/4 in. (0.64 cm) phone jack
(1) DB-15F
IEC 320 connector
(1) Power switch
(4) Intercom On/Off Switches
(1) 1/4 in. (0.64 cm) panel
mounting jack
(1) XLR-4M
(1) Panel / headset mic switch
(1) Mic on button
(1) All talk button
(1) Announce button
(1) Party line link button
(4) Program
ON-OFF-INTERRUPT
DIP switches
(1) Program level control
(4) Listen adjust controls
(4) Channel null adjust controls
4-3
(4) Channel program feed adjust
controls
(4) Talk buttons
(4) Call buttons
(4) Listen buttons
(1) RMK button
(1) Speaker ON-OFF switch
(1) Speaker volume control
(4) Short LEDs
(1) Panel mic gain control
(1) Sidetone adjust control
(1) Headset audio limiter DIP
switch
(3) Interrupt enable DIP switches
(4) Auto-call DIP switches
(4) Auto-talk/listen DIP switches
(4) Talk latch disable DIP switches
(4) Line length DIP switches
(10) Channel Assignment Slide
switches
Environmental
Dimensions
Weight
32 - 122o F (0 - 50o C)
19 in. W x 3.5 in. H x 10.5 in. D
(483 mm x 88 mm x 267 mm)
10.93 lbs. (4.97 kg)
Notice About Specifications
While Clear-Com makes every attempt to maintain the accuracy of the
information contained in its product manuals, that information is subject to
change without notice. Performance specifications included in this manual are
design-center specifications and are included for customer guidance and to
facilitate system installation. Actual operating performance may vary.
4-4
SB-704 MAIN STATION
LIMITED WARRANTY
Vitec Group Communications (VGC) warrants that at the time of purchase, the
equipment supplied complies with any specification in the order confirmation
when used under normal conditions, and is free from defects in workmanship
and materials during the warranty period.
VGC offers 24 x 7 customer
support if you have an
Extended Warranty or
Service Contract.
Return Material
Authorization (RMA)
numbers are required for all
returns.
Both warranty and
non-warranty repairs are
available.
During the warranty period VGC, or any service company authorized by VGC,
will in a commercially reasonable time remedy defects in materials, design, and
workmanship free of charge by repairing, or should VGC in its discretion deem it
necessary, replacing the product in accordance with this limited warranty. In no
event will VGC be responsible for incidental, consequential, or special loss or
damage, however caused.
WARRANTY PERIOD
The product may consist of several parts, each covered by a different warranty
period. The warranty periods are:
• Cables, accessories, components, and consumable items have a limited
warranty of 90 days.
• Headsets, handsets, microphones, and spare parts have a limited warranty of
one year.
• UHF wireless IFB products have a limited warranty of one year.
• UHF wireless intercom systems have a limited warranty of three years.
• All other Clear-Com and Drake brand systems and products, including
beltpacks, have a limited warranty of two years.
The warranty starts at the time of the product’s original purchase. The warranty
start date for contracts which include installation and commissioning will
commence from the earlier of date of the Site Acceptance Test or three months
from purchase.
TECHNICAL SUPPORT
To ensure complete and timely support to its customers, VGC’s User Support
Center is staffed by qualified technical personnel. Telephone and email technical
support is offered worldwide by the User Support Center.
The User Support Center is available to VGC’s customers during the full course
of their warranty period. Telephone support during the warranty period will be
offered at no charge between 09:00 and 17:00 according to the customer’s local
time zone.
In addition, for customers who purchase an Extended Warranty or Service
Contract, 24-hour customer support is offered immediately upon purchase of
WARRANTY
i
such agreement. For more information, contact your authorized dealer,
distributor, or sales representative.
Instructions for reaching VGC’s User Support Centers are given below.
Telephone for Europe, Middle East and Africa: +49 40 6688 4040
Telephone for the Americas and Asia: +1 510 337 6600
Email: [email protected]
Once the standard warranty period has expired, the User Support Center will
continue to provide telephone support if you have purchased an Extended
Warranty or Service Contract. In these cases, you will have access to telephone
support 24 hours per day, 7 days per week.
WARRANTY REPAIRS AND RETURNS
Before returning equipment for repair, contact a User Support Center to obtain a
Return Material Authorization (RMA). VGC representatives will give you
instructions and addresses for returning your equipment. You must ship the
equipment at your expense, and the support center will return the equipment at
VGC’s expense.
For out-of-box failures, use the following contact information:
Europe, Middle East and Africa
Tel: +44 1223 815000 Email: [email protected]
North America, Canada, Mexico, Caribbean & US Military
Tel: +1 510 337 6600 Email: [email protected]
Asia Pacific & South America
Tel: +1 510 337 6600 Email: [email protected]
VGC has the right to inspect the equipment and/or installation or relevant
packaging.
NON-WARRANTY REPAIRS AND RETURNS
For items not under warranty, you must obtain an RMA by contacting the User
Support Center. VGC representatives will give you instructions and addresses for
returning your equipment.
You must pay all charges to have the equipment shipped to the support center
and returned to you, in addition to the costs of the repair.
EXTENDED WARRANTY
If you purchase an Extended Warranty, you are also given access free of charge to
the User Support Center 24 hours a day, 7 days a week.
You can purchase an extended warranty at any time during the first two years of
ownership of the product. The purchase of an extended warranty extends to five
ii
WARRANTY
years the warranty of any product offered with a standard two-year warranty.
The total warranty period will not extend beyond five years. Any purchase of an
extended warranty provides 24 x 7 customer support in addition to the warranty
immediately upon purchase of the warranty extension.
Note: VGC does not offer warranty extensions on UHF wireless intercom
systems, or on any product with a 1-year or 90-day warranty.
SERVICE CONTRACT
VGC also offers service contracts that provide 24 x 7 telephone support, advance
replacements, training, proactive maintenance, on-site visits, and no charge for
repair or replacement of equipment. For more information, contact your
authorized dealer, distributor, or sales representative.
LIABILITY
THE FOREGOING WARRANTY IS VGC'S SOLE AND EXCLUSIVE
WARRANTY. THE IMPLIED WARRANTY OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE AND ANY OTHER
REQUIRED IMPLIED WARRANTY SHALL EXPIRE AT THE END OF
THE WARRANTY PERIOD. THERE ARE NO OTHER WARRANTIES
(INCLUDING WITHOUT LIMITATION WARRANTIES FOR
CONSUMABLES AND OTHER SUPPLIES) OF ANY NATURE
WHATSOEVER, WHETHER ARISING IN CONTRACT, TORT,
NEGLIGENCE OF ANY DEGREE, STRICT LIABILITY OR OTHERWISE,
WITH RESPECT TO THE PRODUCTS OR ANY PART THEREOF
DELIVERED HEREUNDER, OR FOR ANY DAMAGES AND/OR LOSSES
(INCLUDING LOSS OF USE, REVENUE, AND/OR PROFITS). SOME
STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF
INCIDENTAL OR CONSEQUENTIAL DAMAGES OR THE
LIMITATION ON HOW LONG AN IMPLIED WARRANTY LASTS, SO
THE ABOVE LIMITATIONS MAY NOT APPLY TO YOU. IN ANY
EVENT, TO THE MAXIMUM EXTENT PERMITTED UNDER
APPLICABLE LAW, VGC'S LIABILITY TO CUSTOMER HEREUNDER
SHALL NOT UNDER ANY CIRCUMSTANCES EXCEED THE COST OF
REPAIRING OR REPLACING ANY PART(S) FOUND TO BE
DEFECTIVE WITHIN THE WARRANTY PERIOD AS AFORESAID.
This warranty does not cover any damage to a product resulting from cause other
than part defect and malfunction. The VGC warranty does not cover any defect,
malfunction, or failure caused beyond the control of VGC, including
unreasonable or negligent operation, abuse, accident, failure to follow
instructions in the manual, defective or improperly associated equipment,
attempts at modification and repair not approved by VGC, and shipping
damage. Products with their serial numbers removed or defaced are not covered
by this warranty.
This warranty does not include defects arising from installation (when not
performed by VGC), lightning, power outages and fluctuations, air conditioning
failure, improper integration with non-approved components, defects or failures
WARRANTY
iii
of customer furnished components resulting in damage to VGC provided
product.
This limited warranty is not transferable and cannot be enforced by anyone other
than the original consumer purchaser.
This warranty gives you specific legal rights and you may have other rights which
vary from country to country.
iv
WARRANTY
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