Tait TB8100 User manual

TB8100 base station
Installation Guide
MBA-00009-07
Issue 7
February 2007

2TB8100 Installation Guide
© Tait Electronics Limited February 2007
Contact Information
Tait Radio Communications
Corporate Head Office
Tait Electronics Limited
P.O. Box 1645
Christchurch
New Zealand
For the address and telephone number of regional
offices, refer to the TaitWorld website:
We b s i t e: http://www.taitworld.com
Technical Support
For assistance with specific technical issues, contact
Technical Support:
E-mail: [email protected]
We b s i t e: http://support.taitworld.com
Copyright and Trademarks
All information contained in this manual is the property
of Tait Electronics Limited. All rights reserved.
This manual may not, in whole or in part, be copied,
photocopied, reproduced, translated, stored, or reduced
to any electronic medium or machine-readable form,
without prior written permission from Tait Electronics
Limited.
The word TAIT and the TAIT logo are trademarks of
Tait Electronics Limited.
All trade names referenced are the service mark,
trademark or registered trademark of the respective
manufacturers.
Disclaimer
There are no warranties extended or granted by this
manual. Tait Electronics Limited accepts no
responsibility for damage arising from use of the
information contained in the manual or of the
equipment and software it describes. It is the
responsibility of the user to ensure that use of such
information, equipment and software complies with the
laws, rules and regulations of the applicable
jurisdictions.
Enquiries and Comments
If you have any enquiries regarding this manual, or any
comments, suggestions and notifications of errors,
please contact Technical Support.
Updates of Manual and Equipment
In the interests of improving the performance, reliability
or servicing of the equipment, Tait Electronics Limited
reserves the right to update the equipment or this
manual or both without prior notice.
Intellectual Property Rights
This product may be protected by one or more patents
of Tait Electronics Limited together with their
international equivalents, pending patent applications
and registered trade marks: NZ508054, NZ508340,
NZ508806, NZ508807, NZ509242, NZ509640,
NZ509959, NZ510496, NZ511155, NZ511421,
NZ516280/519742, NZ519118, NZ519344,
NZ520650/537902, NZ521450, NZ524509,
NZ524537, NZ524630, NZ530819, NZ534475,
NZ534692, NZ535471, NZ536945, NZ537434,
NZ534369, NZ522236, NZ524378, AU2003281447,
AU2002235062, AU2004216984, CA2439018,
EU03784706.8, EU02701829.0, EU04714053.8,
GB23865476, GB2386010, GB2413249,
GB0516092.4, US60/613748, US60/539617, US10/
520827, US10/468740, US5,745,840, US10/520827.
To Our European Customers
Tait Electronics Limited is an
environmentally responsible company
which supports waste minimization and
material recovery. The European Union’s
Waste Electrical and Electronic Equipment
Directive requires that this product be disposed of
separately from the general waste stream when its
service life is over. Please be environmentally
responsible and dispose through the original supplier,
your local municipal waste “separate collection” service,
or contact Tait Electronics Limited.

TB8100 Installation Guide 3
© Tait Electronics Limited February 2007
Contents
1 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Personal Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Equipment Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Regulatory Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4 Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.5 Grounding and Lightning Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.6 Recommended Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.7 Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.8 Installing the Base Station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2 Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.1 Auxiliary Power Supply Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.2 RF Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.3 System Control Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.4 System Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.5 Service Kit Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.6 12V PA Power Saving Control Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Associated Documentation
MBA-00001-xx TB8100 Specifications Manual.
MBA-00005-xx TB8100 Installation and Operation Manual.
MBA-00010-xx TB8100 Service Kit User’s Manual.
MBA-00011-xx TB8100 Calibration Kit User’s Manual.
MB8100-80-00-806 TB8100 Alarm Center User’s Manual.
MBA-00013-xx TBA0STU/TBA0STP Calibration and Test Unit Operation Manual
MBA-00016-xx TB8100 Service Manual.
The characters xx represent the issue number of the documentation. All available TB8100 product
documentation is provided on the Product CD supplied with the base station. Updates may also
be published on the Tait Technical Support website (http://support.taitworld.com).
Tuning and Configuration
If your TB8100 base station has not been tuned to your requirements at the factory, you will need
to tune the reciter modules before operating them in your radio system. To do this you will need
to use the Calibration Kit software included on the Product CD, plus the Calibration and Test Unit.
The TB8100 base station has been programmed with a default software configuration and default
passwords at the factory. You will need to use the Service Kit software to configure your base station
to suit the requirements of your radio system. Refer to the Calibration Kit and Service Kit
documentation for full details on these procedures.

4Installation TB8100 Installation Guide
© Tait Electronics Limited February 2007
1 Installation
This chapter describes how to install the TB8100 base station in a standard
19 inch rack or cabinet. It also provides some general information on safety
precautions and site requirements. We recommend that you read the entire
chapter before beginning the installation.
1.1 Personal Safety
1.1.1 Lethal Voltages
Warning!! The PMU contains voltages that may be lethal.
Refer to the ratings label on the rear of the
module.
The TB8100 base station must be installed so that the rear of the PMU is
located in a service access area. The PMU must be connected to the mains
supply source by trained personnel in accordance with local and national
regulations.
Disconnect the mains IEC connector and wait for five minutes for
the internal voltages to self-discharge before dismantling. The AC
power on/off switch does not isolate the PMU from the mains. It
breaks only the phase circuit, not the neutral.
The PMU should be serviced only by qualified technicians. There are no
user-replaceable parts inside. If the PMU is damaged and does not function
properly, stop the module safely and contact your nearest Tait Dealer or
Customer Service Organisation immediately.
All servicing should be carried out only when the PMU is powered through
a mains isolating transformer of sufficient rating. We strongly
recommend that the mains power to the whole of the repair and test area
is supplied via an earth leakage circuit breaker.
1.1.2 Explosive Environments
Warning!! Do not operate TB8100 equipment near electri-
cal blasting caps or in an explosive atmosphere.
Operating the equipment in these environments
is a definite safety hazard.

TB8100 Installation Guide Installation 5
© Tait Electronics Limited February 2007
1.1.3 Proximity to RF Transmissions
Do not operate the transmitter when someone is standing within 90cm (3ft)
of the antenna. Do not operate the transmitter unless you have checked that
all RF connectors are secure.
1.1.4 High Temperatures
Take care when handling a PMU or PA which has been operating recently.
Under extreme operating conditions (+60°C [+140°F] ambient air
temperature) or high duty cycles the external surfaces of the PMU and PA
can reach temperatures of up to +80°C (+176°F).
1.2 Equipment Safety
1.2.1 ESD Precautions
Important This equipment contains devices which are susceptible to
damage from static charges. You must handle these devices
carefully and according to the procedures described in the
manufacturers’ data books.
We recommend you purchase an antistatic bench kit from a reputable
manufacturer and install and test it according to the manufacturer’s
instructions. Figure 1.1 shows a typical antistatic bench set-up.
You can obtain further information on antistatic precautions and the dangers
of electrostatic discharge (ESD) from standards such as ANSI/ESD
S20.20-1999 or BS EN 100015-4 1994. The Electrostactic Discharge
Association website is http://www.esda.org.
Figure 1.1 Typical antistatic bench set-up
common point ground
(building ground or
mains ground via 1M
ohm series resistor)
conductive wrist strap dissipative rubber
bench mat

6Installation TB8100 Installation Guide
© Tait Electronics Limited February 2007
1.2.2 Antenna Load
Important The PA may be damaged if the load is removed or switched
while the PA is transmitting.
Introduction One of the inherent characteristics of 28V LDMOS technology is its lower
breakdown voltage. Tait Electronics, and most other major base station
manufacturers, have adopted this technology to benefit from its superb wide
band performance and high efficiency.
The MRF9060 LDMOS FET is used as the final power device in the
TB8100 50W and 100W PAs. In these PAs, the MRF9060 device is
protected from high VSWR by the design of the circuitry. This circuitry
makes it impossible to damage the device by keying the PA into a
mismatched load, or if the load deteriorates over even a short period of time
(milliseconds). Thus, no PA will fail if it is keyed while connected to a
mismatched load.
However, it is possible to damage the device if all the following conditions
happen at the same time:
■there is a step change in the PA load (i.e. the load is removed)
■the PA is transmitting
■the feed line loss between the PA and the mismatch is <1dB.
The effect of such conditions is variable: some devices will not be destroyed,
and some may fail after repeated load interruptions.
Note Ice on the antenna, or a broken antenna, is unlikely to cause dam-
age to the PA. There should be enough coaxial cable between the
antenna and PA to protect it from high VSWR.
5W PAs will not fail due to a highly mismatched load. They do not use the
60W board with the MRF9060 device.
Recommendations The procedures recommended below should help to protect the PA from
damage under all but the most extreme operating conditions.
1. Do not remove the load from the PA while it is transmitting.
2. Do not connect the PA directly to the antenna. To protect the PA
output stage from load transients (i.e. switching or removing the load)
or atmospheric disturbances (e.g. rain static, electrical storms, etc.),
we recommend that you fit an isolator or cavity filter (e.g. duplexer)
between the PA and the load.
Fit the isolator as close as possible to the RF output connector on the
PA. Do not connect any switching equipment between the isolator
and the PA, unless the switch cannot operate while there is RF
present (i.e. the base station is transmitting).

TB8100 Installation Guide Installation 7
© Tait Electronics Limited February 2007
3. Fit a surge suppressor to the antenna cabling where it enters the
building.
4. Inspect all cables and equipment connected to the TB8100 base
station for defects.
1.2.3 Equipment Grounding
To ensure safe operation the TB8100 base station equipment must be
correctly grounded as described in these installation instructions.
1.2.4 Installation and Servicing Personnel
The TB8100 base station should be installed and serviced only by qualified
personnel.
1.3 Regulatory Information
1.3.1 Distress Frequencies
The 406 to 406.1MHz frequency range is reserved worldwide for use by
Distress Beacons. Do not program transmitters to operate in this frequency
range.
1.3.2 FCC Compliance1
This device complies with part 15 of the FCC Rules. Operation is subject
to the condition that this device does not cause harmful interference.
1.3.3 Unauthorised Modifications
Any modifications you make to this equipment which are not authorised by
Tait Electronics Limited may invalidate your compliance authority’s approval
to operate the equipment.
1.3.4 Health, Safety and Electromagnetic Compatibility in Europe
In the European Community, radio and telecommunications equipment is
regulated by Directive 1999/5/EC, also known as the Radio and
Te l e c o m m u n i c a t i o n s Te r m i n a l E q u i pment (R&TTE) directive. The
1. Refer to the TB8100 Specifications Manual (MBA-00001-xx) for more information on the
compliance standards to which the TB8100 base station equipment has been tested and approved.

8Installation TB8100 Installation Guide
© Tait Electronics Limited February 2007
requirements of this directive include protection of health and safety of users,
as well as electromagnetic compatibility.
Intended Purpose of
Product This product is an FM radio transceiver. It is intended for radio-
communication in the Private Mobile Radio (PMR) or Public Access
Mobile Radio (PAMR) services, to be used in all member states of the
European Union (EU) and states within the European Economic Area
(EEA).
This product can be programmed to transmit on frequencies that are not
harmonised throughout the EU/EEA, and will require a licence to operate
in each member state. Limitations may apply to transmitter power,
operating frequency, channel spacing, and emission.
Declaration of
Conformity Brief Declarations of Conformity appear on page 32. You can download
the formal Declaration of Conformity from http://eudocs.taitworld.com/.
You can also obtain a signed and dated paper copy of the Declaration of
Conformity from Tait Europe Ltd.
1.4 Environmental Conditions
1.4.1 Operating Temperature Range
The operating temperature range of the TB8100 base station is –30°C to
+60°C (–22°F to +140°F) ambient temperature. Ambient temperature is
defined as the temperature of the air at the intake to the cooling fans.
1.4.2 Humidity
The humidity should not exceed 95% relative humidity through the
specified operating temperature range.
1.4.3 Dust and Dirt
For uncontrolled environments, the level of airborne particulates must not
exceed 100µg/m3.

TB8100 Installation Guide Installation 9
© Tait Electronics Limited February 2007
1.5 Grounding and Lightning Protection
1.5.1 Electrical Ground
The TB8100 modules are grounded by physical contact between the
module case and the subrack. To ensure a good ground connection you
must tighten each module retaining clamp securely (refer to “Replacing
Modules” in the Installation and Operation Manual for the correct torque).
A threaded grounding connector is provided on the rear of the subrack for
connection to the site ground point (refer to “Connection” in the
Installation and Operation Manual for more details).
1.5.2 Lightning Ground
It is extremely important for the security of the site and its equipment that
you take adequate precautions against lightning strike. Because it is outside
the scope of this manual to provide comprehensive information on this
subject, we recommend that you conform to your country’s standards
organisation or regulatory body.
1.6 Recommended Tools
It is beyond the scope of this manual to list every tool that an installation
technician should carry. However, the following tools are specifically
required for installing the TB8100 base station:
■Pozidriv PZ3 screwdriver for the M6 screws used in the DC input
terminals on the PMU; M6 screws are also used to secure the subrack to
the cabinet in Tait factory-assembled systems
■Pozidriv PZ2 screwdriver for the M4 screws used to secure the module
retaining clamps
■1/4in or 6mm flat blade screwdriver for the fasteners used to secure the
front panel to the subrack
■5/16in or 8mm AF spanner for the SMA connectors.
You can also obtain the TBA0ST2 tool kit from your nearest Tait Dealer or
Customer Service Organisation. It contains the basic tools needed to install,
tune and service the TB8100 base station.

10 Installation TB8100 Installation Guide
© Tait Electronics Limited February 2007
1.7 Ventilation
Always ensure there is adequate ventilation around the TB8100 base station.
Do not operate it in a sealed cabinet. You must keep the ambient
temperature within the specified range, and we strongly recommended that
you ensure that the cooling airflow is not restricted.
Important The cooling fans are mounted on the front panel and will
only operate when the panel is fitted correctly to the front
of the subrack. To ensure adequate airflow through the base
station, do not operate it for more than a few minutes with
the front panel removed (e.g. for servicing purposes).
1.7.1 Ambient Air Temperature Sensor
The ambient air temperature reading
for the TB8100 base station is
provided by the ambient air
temperature sensor board bfitted to
the PA control board.
The sensor board is inserted through
slots in the control board and heatsink
to be positioned between the heatsink
fins.
Important If the sensor board is to provide accurate ambient tempera-
ture readings, it must have forced airflow and must not
come into contact with the metal of the heatsink fins. Do
not stack PAs with the fins together. It is possible for
the fins on one heatsink to slide between the fins on the
other heatsink. This can damage the sensor board, and pos-
sibly result in the heatsink fins becoming locked together.
1.7.2 Cabinet and Rack Ventilation
Refer to Figure 1.2 on page 12.
The cooling airflow for the TB8100 base station enters through the front
panel and exits at the rear of the subrack. For optimum thermal
performance, the heated air that has passed through a base station must not
be allowed to re-enter the air intakes on the front panel. Any space at the
front of the cabinet not occupied by equipment should be covered by a
blanking panel.
b

TB8100 Installation Guide Installation 11
© Tait Electronics Limited February 2007
To allow enough cooling airflow through a cabinet-mounted base station,
we recommend the following:
■an area of at least 150cm2(23in2) of unrestricted ventilation slots or holes
in front of the air intakes for the fans for each subrack; for example,
thirty 6x85mm (0.25x3.3in) slots will allow the recommended airflow
■a vent in the top of the cabinet with an area of approximately 150cm2
(23in2) per subrack, or a similar area of ventilation per subrack at the rear
of the cabinet behind each subrack
■a 2U gap at the top of the cabinet.
Note The ventilation opening must be unrestricted. If the slots or holes
are covered with a filter, mesh or grille, the open area must be
increased to allow the same airflow as an unrestricted opening.
The maximum ambient temperature entering the cabinet must not exceed
+60°C (+140°F).
If you are installing multiple subracks in a cabinet, ensure that there will be
enough cooling airflow through the cabinet after the equipment has been
installed. For example, the recommended maximum number of subracks in
a 38U cabinet is five, as shown in Figure 1.2 on page 12.
If the TB8100 base station is installed in a rack or cabinet with other
equipment with different ventilation requirements, we recommend that the
TB8100 be positioned below this equipment.
Auxiliary Extractor
Fans The TB8100 base station does not require auxiliary extractor fans mounted
in the top of the cabinet. If your cabinet is already fitted with fans, the
following procedures apply:
■if there are six or more 120mm (4.75in) fans, each capable of extracting
160m3per hour (94.2CFM), they must run continuously
■if there are fewer than six fans, you must remove them and ensure the
vent in the top of the cabinet has an area of approximately 150cm2
(23in2) per subrack.
If you have any other configuration, the performance of your system will
depend on how closely you comply with the base station airflow
requirements described above.

12 Installation TB8100 Installation Guide
© Tait Electronics Limited February 2007
Figure 1.2 Typical cabinet ventilation requirements
bventilation slots dairflow entry
cblanking panels eairflow exit
20cm
(8in)
2U
≥17.5cm
(≥7in)
side view front view
top view
c
c
d
e
b
c
c

TB8100 Installation Guide Installation 13
© Tait Electronics Limited February 2007
1.8 Installing the Base Station
Caution A TB8100 base station (subrack complete with mod-
ules) can weigh up to 28kg (62lb), or up to 30kg
(66lb) complete with packaging. We recommend
that you have another person help you unpack and
move the base station. The TBAA03-16 carrying
handles will make it easier to move the base station
once it has been unpacked. If necessary, remove the
modules from the subrack before moving it. In all
cases follow safe lifting practices.
1.8.1 Unpacking the Equipment
Unpacking the Base
Station The TB8100 base station is packed in a strong corrugated cardboard carton
with top and bottom foam cushions. To prevent personal injury and damage
to the equipment, we recommend that two people unpack the base station.
1. Cut the tape securing the flaps at the top of the carton and fold them
flat against the sides b.
Figure 1.3 Unpacking the TB8100 base station
b
e
g
f
hi
cd

14 Installation TB8100 Installation Guide
© Tait Electronics Limited February 2007
2. Rotate the carton carefully onto its side cand then onto its top d,
ensuring that none of the flaps is trapped underneath.
3. Slide the carton upwards over the foam cushions and lift it away e.
Remove the cushion from the bottom of the base station f.
4. Rotate the base station and cushion carefully over the rear of the base
station gso that the base station is the right way up with the cushion
on top h. Remove the cushion from the top of the base station i.
Moving the Base
Station The TBAA03-16 carrying handles can be used to move the base station
once it has been unpacked. The handles fit into the holes in the sides of the
subrack, as shown below.
Disposal of
Packaging If you do not need to keep the packaging, we recommend that you recycle
it according to your local recycling methods. The foam cushions are CFC-
and HCFC-free and may be burnt in a suitable waste-to-energy combustion
facility, or compacted in landfill.
Figure 1.4 Base station carrying handles

TB8100 Installation Guide Installation 15
© Tait Electronics Limited February 2007
1.8.2 Mounting the Subrack
Caution We recommend that you have another person help
you lift the subrack. If necessary, remove the mod-
ules from the subrack before lifting it (refer to
“Replacing Modules” in the Installation and Opera-
tion Manual).
1. Remove the front panel by undoing the fasteners with a quarter turn
anti-clockwise, as described in “Replacing Modules” in the
Installation and Operation Manual.
2. Fit the subrack into the cabinet or rack and secure it firmly with an
M6 (or 0.25in if you are using imperial fittings) screw, flat and spring
washer in each of the four main mounting holes b, as shown in
Figure 1.5.
Note If you need extra mounting security, there are additional mount-
ing holes cprovided at the rear of the subrack for auxiliary sup-
port brackets.
Figure 1.5 Subrack mounting points
bmain mounting holes - front cauxiliary mounting holes - rear
front view
rear view
b
c

16 Installation TB8100 Installation Guide
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1.8.3 Auxiliary Support Bracket
TBAA03-13 auxiliary support brackets can be fitted to the rear of the
TB8100 subrack to provide additional mounting security. Figure 1.6 below
shows a standard TBAA03-13 bracket bfitted in a typical Tait Electronics
cabinet c. If you are not using a Tait cabinet, you may have to make your
own brackets to suit your installation.
Important Yo u must fit the auxiliary support brackets if you intend to
transport a cabinet fitted with a fully built-up TB8100 base
station.
We also recommend that you fit the brackets under the following
conditions:
■when the installation is in an area prone to earthquakes
■when third party equipment is installed hard up underneath the TB8100
subrack.
Figure 1.6 Auxiliary support bracket
c
b

TB8100 Installation Guide Installation 17
© Tait Electronics Limited February 2007
1.8.4 Optional Slide Mounting Rails
You can also use TBAA03-14 slide mounting rails bwhen mounting the
TB8100 base station in a cabinet, as shown in Figure 1.7 below. These rails
will support the base station while you slide it into the cabinet.
However, you must still secure the base station to the cabinet with four M6
(0.25in) screws through the main mounting holes on the front of the
subrack, as shown in Figure 1.5 on page 15.
Important The slide mounting rails are not suitable for transporting a
cabinet fitted with a fully built-up TB8100 base station. In
this case, you must also fit the TBAA03-13 auxiliary sup-
port brackets to the upper set of rear mounting holes c.
Figure 1.7 Optional slide mounting rail - rear view
b
c

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1.8.5 Cabling
General We recommend that you try to route all cables to and from the TB8100 base
station along the side of the cabinet so the cooling airflow is not restricted.
DC Power Cabling DC power cables should be well supported so that the terminals on the
PMU and on the ends of the cables do not have to support the full weight
of the cables.
Figure 1.8 below shows two recommended methods of securing these cables
to prevent straining either set of terminals.
Figure 1.8 DC power cabling
secure the cables to the
cabinet to support their
weight

TB8100 Installation Guide Connection 19
© Tait Electronics Limited February 2007
2 Connection
2.1 Auxiliary Power Supply Connections
PMU Auxiliary DC
Output The PMU can provide an auxiliary DC output when it is fitted with the
optional auxiliary power supply board. This board is available with an
output of 13.65VDC, 27.3VDC, or 54.6VDC (depending on the model),
and is current limited to 3A, 1.5A or 750mA respectively. This optional
power supply is available on the auxiliary DC output connector bon the
rear panel. DC from this output can be supplied to the +AUX_V pin on
the system interface connector con the reciter via the auxiliary DC input
connector don the system interface board (see “Reciter Auxiliary DC
Input from PMU” on page 20). The auxiliary DC power cables eare
described in “Power Supply Connections” in the Installation and Operation
Manual.
The auxiliary power supply is configured with the Service Kit (Configure >
Base Station > Miscellaneous > Power configuration > Auxiliary power
control). Its operation can be controlled by Task Manager statements, for
example:
IF Digital input 01 active THEN Enable auxiliary supply.
Refer to the Service Kit documentation for more details.
Note The auxiliary power supply is not available in Sleep or Deep Sleep
modes.
You can connect multiple auxiliary power supply boards in parallel for
redundancy purposes, or to provide an output greater than 40W. Although
no active current sharing is used, auxiliary boards connected in parallel will
current-share before reaching their power limit. For redundancy purposes
the failure (or switching off) of one auxiliary board will not load any other
paralleled auxiliary boards in the circuit.
Two different types of auxiliary DC output connector have been fitted to
the PMU. The pin allocations for the 8-way connector fitted to PMUs
Figure 2.1 Auxiliary DC power supply connections
b
c
de

20 Connection TB8100 Installation Guide
© Tait Electronics Limited February 2007
manufactured before August 2004 are given in the following table. Note
that pins 1 to 4 and pins 5 to 8 on this connector are linked.
The pin allocations for the 2-way connector fitted to PMUs manufactured
from August 2004 onwards are given in the following table.
Reciter Auxiliary DC
Input from PMU The system interface board in the reciter has an auxiliary DC input
connector. DC from the auxiliary DC output on the PMU can be supplied
to the +AUX_V pin on the system interface connector via this input (see
“PMU Auxiliary DC Output” on page 19).
The pin allocations for the auxiliary DC input on the system interface board
are given in the following table. Older boards use the 4-way connector,
while the TaitNet RS-232 board and all other boards manufactured after
March 2005 use the 2-way connector. Note that pins 1 & 3 and pins 2 & 4
on the 4-way connector are linked. Refer to “System Connections” on
page 22 for the pin allocations for +AUX_V on each system interface board.
Pin Description Links
1 +V output
2 +V output
3 +V output
4 +V output
5 ground
6 ground
7 ground
8 ground
Pin Description
1 +V output
2 ground
1
5
26
37
48
8-way connector - external view
2-way connector - external view
b
c