Sonifex Station Master & Talkback Intercoms Instruction Manual

Station Master &
Talkback Intercoms
User Handbook

bStation Master & Talkback Intercoms Handbook
This handbook covers the following product stock codes:
SM-24 Station Master for 2 studios (PPM and VU)
SM-44 Station Master for 4 studios (PPM and VU)
SM2 Add on card to upgrade from an SM24 to SM44
TB-6D Talkback Intercom 6 Way, desktop free standing
TB-6R Talkback Intercom 6 Way, 19 inch rack mounted
TB-SD Talkback Intercom Station Master, desktop free standing
TB-SR Talkback Intercom Station Master, 19 inch rack mounted
Revision 2.03 April 2010
©Sonifex Ltd, 2000-10
All Rights Reserved
Sonifex Ltd, 61, Station Road, Irthlingborough,
Northants, NN9 5QE, England.
Tel : [phone]
Fax : [phone]
Email : [email protected]o.uk or [e-mail]
Web : http://www.sonifex.co.uk
Information in this document is subject to change without notice and does not represent
a commitment on the part of Sonifex Ltd. Sonifex Ltd shall not be liable for any loss or
damage whatsoever arising form the use of information or any error contained in this
manual.
No part of this manual may be reproduced or transmitted in any form or by any means,
electronic or mechanical, including photocopying, recording, or information storage and
retrieval systems, for any purpose other than the purchaser’s personal use, without the
express written permission of Sonifex Ltd.
Unless otherwise noted, all names of companies, products and persons contained herein are
part of a completely ctitious adaptation and are designed solely to document the use of
Sonifex products.

Station Master & Talkback Intercoms Handbook c
CONTENTS
CONTENTS
Warranty & Safety Information i
Warranty and Liability i
Returning the Warranty Card iii
Unpacking the Station Master/Talkback Intercom iii
Safety of Mains Operated Equipment iv
Fuse Rating iv
Power Cable and Connection iv
WEEE & RoHS Directives - Sonifex Statement v
Reporting Faults vi
1 Station Master Introduction 1
Introduction 1
Studio Switching 1
Delay Control 1
Monitoring 2
Audio Distribution 2
Talkback 2
Logging 2
Power Failure 2
Installation Notes 2
Atmosphere 2
Electromagnetic Radiation 2
Connectors and Cabling 3
XLR 3 Pin Connectors 3
¼”‘A’ Gauge Stereo Jack Plugs 3
D-Type Connectors 4
2 Operation 5
Conguration Flowchart 5
Studio Feeds, Transmission Outputs and Logging Outputs 6
Studio Feeds 6
Transmission Outputs 6
Logging Outputs 6
Logging Off-Air instead of Pre-Transmission 6
Monitoring 7
Monitoring Options 8
Enabling Talkback Over the Monitors 8
Mixing or Ducking the Normal Monitor Output During Talkback 9
Fixing the Monitor Output Level for the Phono Connectors 9
Oer and Accept Switching 10
Talkback 11
Delay and Dump Control 13
External Inputs 13
Routing Of External Inputs 13
Altering the External Input Levels 14
3 Connection Details 15
Audio Connections 15
Audio In/Out 1 - 4 16
Studio Controls 17
Controls In/Out 1 & 2 17
Controls In/Out 3 & 4 18
Transmission Outputs 19
Logging Outputs 19
Balanced Logging Outputs 19
Unbalanced Logging Outputs 19
Other Connectors 20

dStation Master & Talkback Intercoms Handbook
CONTENTS
CONTENTS
Mains Power 20
Delay/Dump Control 20
External Inputs 21
Monitor Output 22
Monitor Insert 22
Speaker Output 22
Talkback Microphone Input 22
5 Talkback Introduction 26
TB-6D & TB-6R 6 Way Talkback Intercom Overview 27
Example Application For TB-6D & TB-6R 28
TB-SD & TB-SR Station Master Talkback Intercom Overview 29
Example Application For TB-SD & TB-SR 29
Talkback Intercom Benets 30
Station Master Features 31
Station Master Talkback Operation and Connections 32
6 TB-6D & TB-6R 6 Way Talkback Intercom Conguration & Controls 34
Front Panel Control Details 34
Power LED Indicator 35
Level Control for Monitor Loudspeaker and Headphones 35
External Select Switch 1 35
External Select Switch 2 35
Talkback Switches 35
Built in Electret Microphone 35
Monitor Loudspeaker 35
External Microphone 35
Rear Panel Control Details 36
Headphone Output 36
Mic Select 37
Adjusting the Microphone Gain Level 37
Adjusting the Talkback Gain Level 37
External Input 2 37
External Inputs & Mute Control 37
Talkback Input/Outputs 38
Fuse Holder 38
Mains Input 38
Internal Jumper Conguration 39
Summary of Jumper Settings for the Talkback Unit 39
External Input Muting/Mixing 40
Local/External Talkback 40
TB6 Interconnection Wiring Diagram 42
7 TB-SD & TB-SR Station Master Talkback Intercom Conguration & Controls 43
Front Panel Control Details 43
Power LED Indicator 44
Level Control for Monitor Loudspeaker and Headphones 44
External Select Switch 1 44
External Select Switch 2 44
Talkback Switches 44
Built in Electret Microphone 44
Monitor Loudspeaker 44
External Microphone 44
Rear Panel Control Details 45
Headphone Output 45
Mic Select 46
Adjusting the Microphone Gain Level 46

Station Master & Talkback Intercoms Handbook e
CONTENTS
CONTENTS
Adjusting the Talkback Gain Level 46
External Input 2 46
External Inputs & Mute Control 46
Station Master Remotes 47
Fuse Holder 47
Mains Input 47
Internal Jumper Conguration 48
Summary of Jumper Settings for the Talkback Unit 48
External Input Muting/Mixing 49
Local/External Talkback 49
8 Talkback Intercom Technical Specication 51
Audio & Power Specication 51
Physical Specication 52

fStation Master & Talkback Intercoms Handbook
FIGURES
FIGURES
Figures
Fig 1-1 : XLR-3 Connectors. 3
Fig 1-2 : ¼” Jack Connectors 3
Fig 1-3 : D-Type Connectors. 4
Fig 2-1 : Station Master Block Diagram. 5
Fig 2-2 : Monitor Section of the Front Panel. 7
Fig 2-3 : Station Master Viewed From Above Showing Jumper Positioning. 8
Fig 2-4 : Station Master Oer & Accept Status. 10
Fig 2-5 : Oer & Accept Switches for Studio 1. 10
Fig 2-6 : Front Panel Talkback Switches & Mic Input. 12
Fig 5-1: TB-6D Talkback Intercom 6 Way Desktop & TB-SD Talkback Intercom
Station Master Desktop. 26
Fig 5-2: TB-6R Talkback Intercom 6 Way Rack & TB-SR Talkback Intercom
Station Master Rack. 26
Fig 5-3: Example Application For TB-6D & TB-6R. 28
Fig 5-4: Example Application For TB-SD & TB-SR. 29
Fig 5-5: Talkback Intercom System Block Diagram. 33
Fig 6-1: TB-6D Front Panel. 34
Fig 6-2: TB-6R Front Panel. 34
Fig 6-3: TB-6D Rear Panel. 36
Fig 6-4: TB-6R Rear Panel. 36
Fig 6-5: TB-6D & TB-6R Board Layout. 39
Fig 6-6: Connecting The Talkback Intercom To The Sonifex S2 Mixer Output
Module (S2-OMC). 41
Fig 6-7: Interconnection Wiring Diagram 42
Fig 7-1: Front Panel Controls for TB-SD. 43
Fig 7-2: Front Panel Controls for TB-SR. 43
Fig 7-3: TB-SD Rear Panel. 45
Fig 7-4: TB-SR Rear Panel. 45
Fig 7-5: TB-SD & TB-SR Board Layout. 48
Fig 7-6: Connecting The Talkback Intercom To The Sonifex S2 Mixer Output
Module (S2-OMC). 50

Station Master & Talkback Intercoms Handbook i
WARRANTY & SAFETY
INFORMATION
WARRANTY & SAFETY INFORMATION
Warranty & Safety Information
Warranty and Liability
Important: the purchaser is advised to read this clause
(a) The Company agrees to repair or (at its discretion) replace Goods which are found to
be defective (fair wear and tear excepted) and which are returned to the Company
within 12 months of the date of despatch provided that each of the following are
satised:
(i) notication of any defect is given to the Company immediately upon its
becoming apparent to the Purchaser;
(ii) the Goods have only been operated under normal operating conditions and
have only been subject to normal use (and in particular the Goods must have
been correctly connected and must not have been subject to high voltage or
to ionising radiation and must not have been used contrary to the Company’s
technical recommendations);
(iii) the Goods are returned to the Company’s premises at the Purchaser’s expense;
(iv) any Goods or parts of Goods replaced shall become the property of the
Company;
(v) no work whatsoever (other than normal and proper maintenance) has been
carried out to the Goods or any part of the Goods without the Company’s prior
written consent;
(vi) the defect has not arisen from a design made, furnished or specied by the
Purchaser;
(vii) the Goods have been assembled or incorporated into other goods only in
accordance with any instructions issued by the Company;
(viii) the defect has not arisen from a design modied by the Purchaser;
(ix) the defect has not arisen from an item manufactured by a person other than
the Company. In respect of any item manufactured by a person other than the
Company, the Purchaser shall only be entitled to the benet of any warranty or
guarantee provided by such manufacturer to the Company.

ii Station Master & Talkback Intercoms Handbook
WARRANTY & SAFETY INFORMATION
WARRANTY & SAFETY
INFORMATION
(b) In respect of computer software supplied by the Company the Company does not
warrant that the use of the software will be uninterrupted or error free.
(c) The Company accepts liability:
(i) for death or personal injury to the extent that it results from the negligence of
the Company, its employees (whilst in the course of their employment) or its
agents (in the course of the agency);
(ii) for any breach by the Company of any statutory undertaking as to title, quiet
possession and freedom from encumbrance.
(d) Subject to conditions (a) and (c) from the time of despatch of the Goods from the
Company’s premises the Purchaser shall be responsible for any defect in the Goods
or loss, damage, nuisance or interference whatsoever consequential economic or
otherwise or wastage of material resulting from or caused by or to the Goods. In
particular the Company shall not be liable for any loss of prots or other economic
losses. The Company accordingly excludes all liability for the same.
(e) At the request and expense of the Purchaser the Company will test the Goods to
ascertain performance levels and provide a report of the results of that test. The report
will be accurate at the time of the test, to the best of the belief and knowledge of the
Company, and the Company accepts no liability in respect of its accuracy beyond that
set out in Condition (a).
(f) Subject to Condition (e) no representation, condition, warranty or other term, express
or implied (by statute or otherwise) is given by the Company that the Goods are of
any particular quality or standard or will enable the Purchaser to attain any particular
performance or result, or will be suitable for any particular purpose or use under
specic conditions or will provide any particular capacity, notwithstanding that the
requirement for such performance, result or capacity or that such particular purpose
or conditions may have been known (or ought to have been known) to the Company,
its employees or agents.
(g) (i) To the extent that the Company is held legally liable to the Purchaser for any
single breach of contract, tort, representation or other act or default, the
Company’s liability for the same shall not exceed the Price of the Goods.
(ii) The restriction of liability in Condition (g)(i) shall not apply to any liability
accepted by the Seller in Condition (c).
(h) Where the Goods are sold under a consumer transaction (as dened by the Consumer
Transactions (Restrictions on Statements) Order 1976) the statutory rights of the
Purchaser are not aected by these Conditions of Sale.

Station Master & Talkback Intercoms Handbook iii
WARRANTY & SAFETY
INFORMATION
WARRANTY & SAFETY INFORMATION
Returning the Warranty Card
In order to register the date of purchase so that we can keep you informed of any design
improvements or modications, it is important to complete the warranty registration
document that is enclosed and return it to Sonifex Ltd in the UK, or register online at
www.sonifex.co.uk/register
For your own records you should write down the serial number (which can be found at the
rear of the product.
Serial Number
Unpacking the Station Master/Talkback Intercom
Each product is shipped in protective packaging and should be inspected for damage
before use. Where an item is found to have transit damage, notify your supplier immediately
with all the relevant details of the shipment. Packing materials should be kept for inspection
and also for if the product needs to be returned.

iv Station Master & Talkback Intercoms Handbook
WARRANTY & SAFETY INFORMATION
WARRANTY & SAFETY
INFORMATION
Safety of Mains Operated Equipment
This equipment has been designed to meet the safety regulations currently advised
in the country of purchase and it conforms to the safety regulations specied by
use of the CE Mark.
The power supply is rated to 95 - 265VAC at 47 – 63Hz with a fuse of 2A.
Warning: There are no user serviceably parts inside the machine. If you should ever
need to look inside the unit, always disconnect the mains supply before removing the
equipment covers.
Fuse Rating
The product is supplied with a single fuse in the live conducting path of the power-in feed
at the power supply. For reasons of safety it is important that the correct rating and type of
fuse is used. Incorrectly rated fuses could present a possible re hazard, under equipment
fault conditions.
Power Cable and Connection
An IEC power connector is supplied with the product, which has a moulded plug attached
– this is a legal requirement. If no moulded plug has been supplied with your product,
please contact your supplier, because an IEC connector is always supplied from the
Sonifex factory.
If for any reason, you need to use the product with a dierent power cable, you should use
the following wiring guidelines
Wire Colour Connection
Green, or green and yellow Earth (E)
Blue, or Black Neutral (N)
Brown, or Red Live (L)

Station Master & Talkback Intercoms Handbook v
WARRANTY & SAFETY INFORMATION
WARRANTY & SAFETY
INFORMATION
WEEE & RoHS Directives - Sonifex Statement
The Waste Electrical and Electronic Equipment (WEEE) Directive was agreed on
13 February 2003, along with the related Directive 2002/95/EC on Restrictions
of the use of certain Hazardous Substances in electrical and electronic
equipment (RoHS).
The Waste Electrical and Electronic Equipment Directive (WEEE) aims to minimise the
impacts of electrical and electronic equipment on the environment during their life times
and when they become waste. It applies to a huge spectrum of products. It encourages
and sets criteria for the collection, treatment, recycling and recovery of waste electrical and
electronic equipment. All products manufactured by Sonifex Ltd have the WEEE directive
label placed on the case. It gives a contact for individuals who are unsure about the correct
procedure when the product has reached its “end of use”.
Sonifex Ltd will be happy to give you information about local organisations that can
reprocess the products, or alternatively all products that have reached“end of use”can be
returned to Sonifex and will be reprocessed correctly free of charge.
Sonifex Ltd has phased out the use of certain hazardous substances identied in the
European Union’s Restriction of Hazardous Substances (RoHS) directive. The RoHS directive
limits the use of certain hazardous substances currently used in EEE manufacture, including
lead, mercury, cadmium, hexavalent chromium, and halide-containing compounds PBB
(polybrominated biphenyl) and PBDE (polybrominated diphenyl ether). Elimination of these
substances will result in more environmentally friendly recycling of electronic equipment.
For the products which Sonifex manufacture, the main area where products were aected
was in the use of lead for manufacturing and assembling electronics circuit boards.
Sonifex Ltd practices lead-free (LF) manufacturing processes. LF solder is used on the
surface-mount PCB manufacturing processes and for hand soldering. The printed circuit
boards (PCBs) used are either gold plated, or immersion tin plated, both of which use no
lead. Historically the PCBs were hot air solder levelled (HASL) PCBs which used tin/lead
based solder.
The manufacturing processes include the assembly of purchased components from various
sources. Product is oered as RoHS compliant, or LF, only after sucient evidence is received
from the component manufacturers that their components are RoHS compliant. Sonifex
Ltd relies solely on the distributor, or manufacturer, of the components for identication of
RoHS compliance. Thus whilst every eort is made to ensure compliance, Sonifex Ltd makes
no warranty, or certication, or declaration of compliance concerning said components.
Sonifex Ltd denes“Lead Free” as pertaining to any product, which has been manufactured
by Sonifex Ltd using components which have been declared by the manufacturers as
“Lead Free”. All statements by Sonifex Ltd of RoHS compliance are based on component
manufacturer documentation.

vi Station Master & Talkback Intercoms Handbook
Reporting Faults
Although this Sonifex product is manufactured to the highest standards, it is possible that
minor faults may appear in the equipment over its normal lifetime. If you nd any problems
with the product, please contact your Sonifex distributor, or contact Sonifex directly at the
following address, or fax with a copy of this completed sheet :
To : From:
Sonifex Ltd, Name
61, Station Road, Position
Irthlingborough, Company
Northants. Address
NN9 5QE, UK
Tel : [phone] Tel
Fax : [phone] Fax
Email : [email protected].uk Email
For the Serial No. of your machine, see the
back panel of the unit.
Serial No.
Please describe the error in as much detail as possible (for example what you were doing
when the problem occurred, what actually happened, etc)
Description of Error
Also, if you have any suggestions for additions or upgrades to the unit , we would like to
hear what they are :
Additions that I Would Like to See
REPORTING A FAULT
REPORTING A FAULT

Station Master & Talkback Intercoms Handbook 1
STATION MASTER INTRODUCTION
STATION MASTER
INTRODUCTION 1
1 Station Master Introduction
Introduction
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Station Master is an addition to the Sonifex range of professional audio products designed
for building radio stations on a budget. It combines all the black boxes required for audio
distribution, studio switching, talkback and monitoring for up to 4 studios into a single
package. The Station Master has a number of benets :
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savings over purchasing the discrete parts that Station Master replaces, without any
compromise on quality.
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replaces up to 11U rackspace that discrete components can occupy.
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and remembers this state, providing continuity on restoration of power.
Studio Switching
Station Master accepts stereo audio feeds from up to 4 studios, switching them individually
to transmission using oer and accept operation. The output of the current ‘on-air’ studio is
distributed to the other studios via a dedicated bus, avoiding the need for multiple studio
distribution links.
The output of the Station Master is provided as a stereo pair or a mono feed of the stereo
source. The studio switching is achieved using latching relays and therefore retains its
switch status in the event of power-failure.
Delay Control
A profanity delay can be controlled by the Station Master allowing you to install just one
delay unit that can be shared by your studios and used by the studio currently on air.

2Station Master & Talkback Intercoms Handbook
STATION MASTER
INTRODUCTION
STATION MASTER INTRODUCTION
1
Monitoring
The Station Master is tted with either a pair of true PPM meters, or VU meters, for
monitoring up to 8 stereo sources. These sources consist of the connected studios and four
external sources such as news feeds or o air receivers. The audio can be monitored via
headphones or output through a power amplier capable of driving 10W into 8>speakers.
There are also two ¼” jack insert points for using the Station Master to monitor from
a jack-eld.
Audio Distribution
Station Master distributes the 4 incoming stereo signals to each of the connected studios
without the need for external distribution ampliers. These signals, such as o-air receivers,
news feeds and outside broadcasts, can be professional balanced inputs or at domestic
unbalanced line levels. The gain of the incoming stereo signals can be adjusted from the
front panel. Distribution gain is controlled by a preset potentiometer.
Talkback
The Station Master’s talkback system acts as the master station for talkback with 4 satellite
systems. These can either be the connected studios or other locations such as a record
library or engineering workshop. Individual satellites can talk to each other or broadcast to
all stations.
Logging
To allow for logging of broadcasts the Station Master has a stereo balanced output for
professional logging equipment, together with 3 sets of phono unbalanced outputs for
connection to domestic VCR equipment.
Power Failure
In the event of a power failure to the Station Master, it will continue to route the current on-
air studio to the stereo transmission output. Also, when power is re-applied to the Station
Master, all switching, including the oer and accept switching, will instantly re-initialise to
the conguration when power was lost. This means that your on-air studio can continue
transmitting, even if power to the Station Master has failed.
Installation Notes
Atmosphere
The Station Master should be installed in an area which is not subject to excessive heat or
cold. Also, you should avoid installing it in atmospheric conditions which are dusty, smoky
or dirty, or where there is moisture or vibration.
Do not use liquids to clean the front of the Station Master - wiping with a soft, dry
cloth is advised.
Electromagnetic Radiation
Note that there can be a degradation of the audio quality if the Station Master is used near
to strong sources of electromagnetic radiation. Strong sources include video monitors, and
mains cabling.

Station Master & Talkback Intercoms Handbook 3
STATION MASTER INTRODUCTION
STATION MASTER
INTRODUCTION 1
Connectors and Cabling
Many of the problems associated with installing and maintaining studio equipment are due
to the use of poor cables or faulty connections. It is recommended that, wherever possible,
prewired cables are purchased from recommended manufacturers. If you need bespoke
cables making, please ensure that the work is carried out by a qualied engineer.
The main types of connectors used with the Station Master are the following :
XLR 3 Pin Connectors
The following diagram shows the pin details for the 3 pin XLR sockets and plugs :
Fig 1-1 : XLR-3 Connectors.
¼”‘A’ Gauge Stereo Jack Plugs
1/4”‘A’ Gauge Stereo Jack Plugs can be connected as follows :
Fig 1-2 : ¼” Jack Connectors
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               
           
   
     
     
  
       
   
        
   
      
      

4Station Master & Talkback Intercoms Handbook
STATION MASTER
INTRODUCTION
STATION MASTER INTRODUCTION
1
D-Type Connectors
Three dierent D-Type connectors are used on the Station Master. A 9 pin plug is used for
the Delay/Dump Control. A 25 pin plug is used for the Audio I/O and a 25 pin socket for the
Control I/O connector.
Fig 1-3 : D-Type Connectors.
25 Pin D-Type Plug used
for Audio In/Out
25 Pin D-Type Socket used
for Controls In/Out
Pi n 1 Pi n 13
Pi n 14 Pi n 25
Pi n 25 Pi n 14
Pi n 13 Pi n 1
9 Pin D-Type Plug used
for Delay/Dump Control
Pi n 1
Pi n 6
Pi n 9
Pi n 5

Station Master & Talkback Intercoms Handbook 5
2 Operation
Conguration Flowchart
Fig 2-1 : Station Master Block Diagram.
STATION MASTER
OPERATION 2
STATION MASTER OPERATION

6Station Master & Talkback Intercoms Handbook
Studio Feeds, Transmission Outputs and Logging Outputs
Studio Feeds
Station Master takes an audio feed from each connected studio and routes them to the
transmission and logging outputs. It uses the oer and accept switching to know which
output should be switched to air - as soon as a studio accepts the oer made by the current
on-air studio, the output is switched to the accepting studio. The following connections
should be made :
The audio feed, from the master output of the mixing desk which you are using in each
studio, should be connected to the 25 pin D-type “AUDIO IN/OUT” plug connector, on pins 1,
2, 14 and 15 ( marked TRX left/right phase/non-phase). Pin 13 can be used as the screen for
these connections. This is the audio feed from the studio to the Station Master.
Once all the studios are connected, you will need to connect the Oer and Accept switching
(see the Section marked “Oer and Accept Switching”) to ensure that the correct studio is
switched to the transmission path.
Transmission Outputs
Depending on whether you are transmitting a mono or stereo signal, you can use either the
mono, or stereo balanced XLR-3 transmission outputs to connect the Station Master to a
limiter or processor before being sent to the transmitter.
Logging Outputs
Which logging output you use depends on what type of logging equipment you have
installed in your radio station. If you are using a balanced “professional”piece of logging
equipment, such as the Sonifex Net-Log audio logger, or a balanced PC based recorder,
then the balanced XLR-3 outputs should be connected. There are separate stereo and mono
outputs.
If you are using “consumer” logging equipment, such as domestic DVD-R recorders, then
there are three phono outputs which can be connected. Three outputs have been provided
so that three DVD-R’s can be used to record longer durations.
Logging O-Air instead of Pre-Transmission
You can also choose whether to log the transmission output (before it is sent to the
transmitter), or whether to log the External Input 1, which could be dened as an o-air
receiver, so that you can log what is actually broadcast. On the main motherboard SM-MB-
02, check the following jumpers :
Jumper Set Over Pins Eect
JP5
1 & 2
2 & 3
The left logging output comes from the
transmission path.
The left logging output comes from External Input 1.
JP6
1 & 2
2 & 3
The right logging output comes from the
transmission path.
The right logging output comes from External Input 1.
Note : Items in bold are set as default when shipped.
STATION MASTER
OPERATION
2
STATION MASTER OPERATION

Station Master & Talkback Intercoms Handbook 7
Set the jumpers over pins 2 & 3 if you want to connect an o-air receiver to External Input 1.
See Fig 2-3 for placement of the jumpers on the motherboard.
Monitoring
Fig 2-2 : Monitor Section of the Front Panel.
t 'SPOUQBOFMNPOJUPSJOHJTDBSSJFEPVUVTJOHUIFFJHIU.0/*5034&-&$5CVUUPOTPO
the front of the unit. These buttons control which input is sent to the monitor speaker
outputs, the monitor outputs, the headphones and the meters.
t 5IF.0/*503*/4&35wKBDLTPDLFUTDBOCFVTFEUPNPOJUPSMFGUBOESJHIUTJHOBMT
from a jackeld - they over-ride the MONITOR SELECT selection.
t 5IFi.0/*503-&7&-wWPMVNFDPOUSPMBMUFSTUIFMFWFMPGUIFPVUQVUGSPNUIFNPOJUPS
speakers and the monitor output.
t 5IFi1)0/&4-&7&-wWPMVNFDPOUSPMBMUFSTUIFMFWFMPGUIFPVUQVUGSPNUIF
headphones.
STATION MASTER
OPERATION 2
STATION MASTER OPERATION













 








         
    
      

!
 !
  
 "!

"!



8Station Master & Talkback Intercoms Handbook
Monitoring Options
Inside the Station Master there are a number of jumpers that can be altered to change the
way that the monitor function operates :
Fig 2-3 : Station Master Viewed From Above Showing Jumper Positioning.
Enabling Talkback Over the Monitors
The output of the monitors is normally whatever is selected from the “MONITOR SELECT”
buttons on the front panel. You can also have inter-studio talkback sent to the monitors by
doing the following. On the Monitor and External Input PCB (SM-ML-01) set jumpers JP2 and
JP3 over pins 2 & 3 (see Fig 2-3):
Jumper Set Over Pins Eect
JP2
1 & 2
2 & 3
Monitors (left channel) only output the
monitor selection.
Monitors (left channel) output talkback and the
monitor selection.
JP3
1 & 2
2 & 3
Monitors (right channel) only output the
monitor selection.
Monitors (right channel) output talkback and the
monitor selection.
Note : Items in bold are set as default when shipped.
STATION MASTER
OPERATION
2
STATION MASTER OPERATION
JP2
JP2
3
1
3
1
31
31
JP1 JP5
JP6
JP3
JP3
JP4
JP1
SM-MB-02 Motherboard
SM-ML-01 Monitor &
External Input Board
3
1