Tait TB8100 User manual

TB8100 base station
Calibration Kit
User’s Manual
MBA-00011-07
Issue 7
April 2006

© Tait Electronics Limited April 2006
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:
Website: http://www.taitworld.com
Technical Support
For assistance with specific technical issues, contact
Technical Support:
E-mail: [e-mail]
Website: 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: NZ338097, 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,
GB0516094.0, GB0516092.4, US09/847322, 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 Calibration Kit User’s Manual Contents i
Contents
Preface ..............................................................................................................iii
Typographical Conventions ..............................................................iii
Associated Documentation ...............................................................iii
Publication Record ..........................................................................iii
Basic Tasks .........................................................................................................1
Using the TB8100 Calibration Kit ..........................................................1
About the Toolbar ............................................................................2
About the Status Bar ..........................................................................2
Equipment Required ..............................................................................3
Calibration Overview .............................................................................3
Field Calibration ................................................................................4
Service Center Calibration .................................................................4
Selecting the Communications Port ........................................................5
Connecting to a Reciter Outside the Subrack .........................................5
Connecting to a Reciter via the Control Panel .......................................7
Disconnecting from the Base Station/Reciter .........................................7
Troubleshooting .....................................................................................8
Adjusting the Frequency Setup ........................................................................9
Adjusting the Receiver Lock Band .........................................................9
Tuning a UHF Receiver Front End ......................................................10
Tuning a VHF Receiver Front End ......................................................12
Adjusting the Exciter Lock Band ..........................................................14
Selecting the Exciter Sub-band .............................................................15
Calibrating the Reciter ....................................................................................16
Calibrating the Exciter ..........................................................................16
Automatically Tune the Frequency Control Loop (FCL) .................16
Calibrating the FCL .........................................................................16
Calibrating the VCO .......................................................................18
Calibrating the RSSI .............................................................................19
Audio Calibration .................................................................................20
Calibrating the Balanced Lines .........................................................20
Calibrating the Unbalanced Lines ....................................................21
Carrier Frequency Offset Adjustment
(Older Reciters) ....................................................................................23
Carrier Frequency Offset Adjustment
(Newer Reciters) ..................................................................................24
Calibrating the Power Amplifier ....................................................................27
Calibrating the PA Bias .........................................................................27
Calibrating the Forward and Reverse Detector Bias Voltages ................27
Calibrating the PA Power .....................................................................28
Troubleshooting Tips ......................................................................29

ii Contents © Tait Electronics Limited April 2006
Calibrating the Power Management Unit .................................................... 30
Calibrating the PMU Output Voltage .................................................. 30
Index .................................................................................. 34

TB8100 Calibration Kit User’s Manual Preface iii
Preface
Welcome to the TB8100 Calibration Kit User’s Manual. This manual provides
you with information about the Tait TB8100 Calibration Kit in PDF format.
You can view it online or print it if you want a paper copy. It describes how to
use Version 03.00 of the Calibration Kit.
Typographical Conventions
‘File > Exit’ means ‘click File on the menu bar, then select Exit’.
Associated Documentation
■Online Help. The Calibration Kit also has online Help. It contains more or
less the same information as this manual. To view it, start the Calibration
Kit, then press F1 or click the Help icon on the toolbar. If you are in a dialog
box, click the Help button.
■TBA0STU/TBA0STP CTU Operation Manual. This manual (MBA-00013-
xx) provides detailed information about the Calibration and Test Unit.
■TB8100 Installation and Operation Manual (MBA-00005-xx).
■TB8100 Service Manual (service centers only). A glossary of terms is available
in this manual (MBA-00016-xx).
For additional items, see the TB8100 Installation and Operation Manual and
the TB8100 Service Kit User’s Manual or online Help.
Publication Record
Version Date Description
1.0 June 2003 First release of the manual for Version 1.0.0
of the Tait TB8100 Calibration Kit software.
02.00 March 2004 Minor quality issues resolved and software
changes documented for Version 02.00.
02.01
(MBA-00011-03)
September
2004
Carrier Frequency Offset Adjustment
procedure for reciter version 00.03+ added.
PA store supply voltage and PMU output
voltage calibration added.
02.02
(MBA-00011-04)
December
2004
Changes for K-band reciters.
02.05
(MBA-00011-05)
March
2005
Minor changes for Calibration Kit software
version 02.05. L-band reciters.
02.07
(MBA-00011-06)
June 2005 Separate sections for UHF and VHF receiver
front end tuning. Selecting Exciter sub-band
for exciters with two VCOs
03.00
(MBA-00011-07)
April 2006 Murata tuning tool now not used for UHF
(H-band and K-band) receiver front end, as a
different helical filter is fitted.

1 Using the TB8100 Calibration Kit © Tait Electronics Limited April 2006
Basic Tasks
The TB8100 Calibration Kit is a Windows-based software program that allows
you to adjust the switching ranges of Tait TB8100 base stations (both receiver
and transmitter), and to flatten the receiver response across that switching range.
The TB8100 Calibration Kit is also used to calibrate the reciter, the PA, and
the PMU after servicing.
Using the TB8100 Calibration Kit
When you start the TB8100 Calibration Kit, the main program window
appears.
The main program window has four tabs. The Calibration Wizards displayed
on each tab are only visible once you are connected to the reciter or the base
station.
When the TB8100 Calibration Kit is connected to the reciter or base station,
you can view further details (such as module number, type, serial number, band,
and hardware version) about the currently selected module by clicking Show
Details.
Frequency Setup
tab Shows the three Calibration Wizards that take you step-by-step through the
frequency setup.
ReciterCalibration
tab Shows the seven calibration procedures that you can perform on the reciter.
The Calibration Wizard takes you step-by-step through the procedure you
have selected.
PA Calibration tab Shows the four calibration procedures that you can perform on the power
amplifier. The Calibration Wizard takes you step-by-step through the
procedure you have selected.
PMU Calibration
tab Shows the procedure that you can perform on the PMU.
Menu bar
Toolbar
Calibration
Wizards
Status bar

TB8100 Calibration Kit User’s Manual Using the TB8100 Calibration Kit 2
About the Toolbar
The toolbar gives you quick access to commonly used menu commands. For
example, instead of selecting Base Station > Calibrate, you can click the
Calibrate icon on the toolbar.
Connect Connects the TB8100 Calibration Kit to the base station and opens the
communication channels.
Switch Base
Station Lets you select another base station to calibrate if there are multiple base stations
in the rack (not currently supported).
Calibrate Runs the Calibration Wizard for the currently selected task.
Options Allows you to set the COM port and default calibration mode.
Help Opens the online help for the window you are currently in.
About the Status Bar
The status bar provides you with useful information that supplements the
display in the main window.
Miscellaneous messages COM port in use

3 Equipment Required © Tait Electronics Limited April 2006
Equipment Required
You need the following equipment for field calibration:
■Calibration and Test Unit (CTU, order code TBA0STU), which comes
complete with the cables you will need for connection to the reciter/PA and
the PC. For more information about the CTU, please refer to TN-778 The
Calibration and Test Unit.
■Tool kit (order code TBA0ST2) which comprises tuning tools and the
required screwdrivers in a tool pouch. The ceramic-tipped Murata tuning
tool is used for most procedures, but the metal-tipped Johanson 8777 tuning
tool with its narrower blade is needed for tuning the front end of H-band
and K-band receivers.
■10-30 V DC power supply (if the PMU does not have a 12 V or 24 V
auxiliary power supply module)
■RS-232 cable
■RF attenuator (optional – depends on the setup)
You may need the following additional equipment for a service center
calibration:
■Frequency counter
■Modulation meter
■RF signal source
■AC millivoltmeter (one with a differential input may be required for
“Calibrating the Balanced Lines” on page 20)
Refer to the individual procedures for equipment setup diagrams.
Calibration Overview
Any calibration process creates digital values and a calibration date, which are
stored in the base station. The Service Kit can display the date of the last
calibration. Many calibration procedures initially clear the stored digital values.
If you do not complete the procedure or the stored digital values are outside
acceptable limits, the module is left uncalibrated. An uncalibrated reciter will go
into Download mode on startup and cannot be put into Run mode. An
uncalibrated PA generates a calibration invalid alarm.
If the procedure you are performing requires access to tuning holes, you need
to remove the reciter from the subrack and connect to it via the CTU.
The following tables summarise, for each procedure, whether or not you need
to remove the reciter from the subrack, and what equipment (in addition to a
PC with the TB8100 Calibration Kit software) you will need.

TB8100 Calibration Kit User’s Manual Calibration Overview 4
Field Calibration
The following procedures can be carried out in the field.
Service Center Calibration
The following additional procedures may need to be carried out after a module
has been serviced.
Note: Replacing or repairing a board module may mean that the
module’s product code, product type (frequency band), serial
number, and/or hardware version need to be re-entered or altered.
To do this, your Calibration Kit needs a dongle. The Service Manual indicates
when a module detail needs re-entering or altering.
Reciter
Procedure Connection Equipment Required
Adjusting receiver lock band Outside subrack Murata tuning tool, CTU
Tuning the receiver Outside subrack Murata tuning tool,
Johanson tuning tool (for H-
band and K-band reciters),
CTU
Adjusting exciter lock band Outside subrack Murata tuning tool, CTU
Adjusting the carrier frequency
offset
Depends on
reciter
Murata tuning tool,
Frequency counter, RF
attenuator (only if using PA)
Procedure Connection Equipment Required
Automatically tuning FCL Inside subrack None
Calibrating the FCL modulation Outside subrack Murata tuning tool, CTU,
modulation meter, RF
attenuator (only if using PA)
Calibrating the VCO modulation Outside subrack Murata tuning tool, CTU,
modulation meter, RF
attenuator (only if using PA)
Calibrating the RSSI Inside subrack RF signal source
Calibrating the balanced lines Inside subrack CTU, AC millivoltmeter
(perhaps with differential
input)
Calibrating the unbalanced lines Inside subrack CTU, AC millivoltmeter

5 Selecting the Communications Port © Tait Electronics Limited April 2006
Power Amplifier
Power
Management Unit
Selecting the Communications Port
Before you connect to a base station, you should first define the
communications (COM) port that you want to use.
To select the COM port
1. Select Tools > Options.
2. Select the port that you want to use from the COM Port list.
Note: The available COM ports are detected by the program and
appear in the list.
3. Click OK.
The COM port you selected is now shown on the status bar.
Connecting to a Reciter Outside the Subrack
Field calibration procedures require access to the tuning holes, so you need to
remove the reciter from the subrack and connect to it using a CTU.
Equipment ■Calibration and test unit (CTU)
■An IBM compatible PC
■10-30 V DC power supply
■16-way cable
■RS-232 cable
Procedure Connection Equipment Required
Calibrating the PA bias Inside subrack None required
Calibrating the forward &
reverse detector bias voltages
Inside subrack None required
Calibrating the PA power Inside subrack None required
Procedure Connection Equipment Required
Output voltage calibration Inside subrack Digital multimeter

TB8100 Calibration Kit User’s Manual Connecting to a Reciter Outside the Subrack 6
Setup
To connect to the reciter
1. Remove the reciter from the subrack (for instructions, see the Installation
and Operation Manual).
2. Set up the equipment as follows.
■Connect the reciter to the calibration and test unit (CTU) using the 16-
way cable.
■Connect your computer to the CTU by plugging the RS-232 cable into
the programming port.
■Using the power cable supplied in the calibration test kit, connect the
reciter to the 10-30 V DC power supply, but do not power it up yet. If
the base station’s PMU has a 12 V or 24 V auxiliary power output, you
can use this as the power supply. A connector is supplied with the CTU.
3. Start the TB8100 Calibration Kit program, and check that the correct COM
port is selected.
4. Click Connect to start the connection process.
5. When you see the “Waiting for logon prompt from Reciter” screen, power
up the reciter. If it is already on, turn it off, and then on.
6. When the TB8100 Calibration Kit program has successfully connected to
the reciter, the Calibration Wizards are displayed in the main window.
You are now ready to tune and calibrate the reciter.
3
6
4
5
2
1
7
8
1PC 516-way cable
2RS-232 cable 6Reciter
3CTU 7Power cable
4Programming port 810-30 V DC power supply

7 Connecting to a Reciter via the Control Panel © Tait Electronics Limited April 2006
Connecting to a Reciter via the Control Panel
For calibration procedures that do not require access to tuning holes, you can
leave the reciter in the subrack and connect your PC to the control panel as
follows.
Equipment ■An IBM compatible PC
■RS-232 cable
Setup
To connect to a reciter in the subrack
1. Connect your computer to the base station by plugging the RS-232 cable
into the serial port of the base station’s control panel.
Note: If the base station is fitted with a TaitNet RS232 system
interface, the control panel serial port is disabled; connect to the
serial port at the reciter rear instead.
2. Start the TB8100 Calibration Kit program, and check that the correct COM
port is selected.
3. Click Connect to start the connection process.
4. As soon as you see the “Waiting for logon prompt from Reciter” screen,
power up the base station. If it is already on, turn it off, and then on.
5. When the TB8100 Calibration Kit program has successfully connected to
the base station, the Calibration Wizards are displayed in the main window.
You are now ready to carry out calibration procedures.
Disconnecting from the Base Station/Reciter
Once calibration is completed, click Disconnect before exiting the Calibration
Kit.
Important: Disconnecting when a calibration process is not
completed may leave the base station in an uncalibrated state.
4
1
3
2
1Base station 3RS-232 cable
2Serial port 4PC

TB8100 Calibration Kit User’s Manual Troubleshooting 8
Troubleshooting
Application Errors All application errors are recorded in a log file called “CalError.log”. The data,
time, location, and any other useful information is stored in this file, which may
be helpful when troubleshooting.
The file is saved in the Logfiles subfolder of the application folder and stores up
to 1000 of the most recent logged items.
Verifying the
Software Version If you need to verify the version of the TB8100 Calibration Kit, select
Help > About.
Commands
Record All the commands sent and received by TB8100 Calibration Kit are saved in a
file called “CCTM.log”. The date, time, command number, and parameters are
all stored in this file, which may be helpful when troubleshooting.
The file is also saved in the Logfiles subfolder and stores up to 1000 of the most
recent logged items.

9 Adjusting the Receiver Lock Band © Tait Electronics Limited April 2006
Adjusting the Frequency Setup
Before the TB8100 base station is installed, connected, and configured, you
must prepare it for operation by adjusting the switching range of the receiver,
optimising the receiver response across the switching range, and adjusting the
exciter lock band or selecting an exciter sub-band.
Note: If the required switching range for the base station has already
been defined, you don’t need to perform these procedures.
Tip: Use the TB8100 Service Kit to monitor the base station and
find out its current switching range.
Important: Be careful when using the tuning tools. Applying too
much pressure or attempting to turn the tool beyond the end of the
range can crack the tuning slug. Unscrewing a slug too far can
remove it completely.
Adjusting the Receiver Lock Band
The first step in preparing the TB8100 base station for operation is to adjust the
receiver lock band (switching range). The lock band is the range of frequencies
that the receiver is calibrated to operate on.
Equipment ■Murata tuning tool
■CTU
To adjust the receiver lock band
1. Remove the reciter from the subrack. (For instructions, see the Installation
and Operation Manual.)
2. Connect the Calibration Kit to the reciter (see “Connecting to a Reciter
Outside the Subrack” on page 5).
3. Select the Frequency Setup tab, and double-click Set Receiver VCO. The
Set Receiver VCO Wizard appears. The display varies, depending on the
reciter band.
4. Enter the Center Frequency (which must be a multiple of 500 kHz) of the
lock band that you want to use, and click Next.
5. Insert the Murata tuning tool into the correct receiver VCO tuning hole for
the reciter type (see below) and then click Next.
6. Adjust the receiver VCO trimmer until the actual band matches the desired
band. The bands turn green.
7. Click Finish. This stores the lock band in the reciter.
The icon on the Frequency Setup tab indicates that this task is com-
plete. Proceed to tune the front end.

TB8100 Calibration Kit User’s Manual Tuning a UHF Receiver Front End 10
Tuning a UHF Receiver Front End
The second step in tuning the reciter frequency is to tune the receiver front
end, by adjusting the helical filters. Tuning aims to maximise the receiver’s
sensitivity and to optimise its response across the lock band (switching range).
To help you do this, there is a graph of the RSSI readings in step two of the
Tune Receiver Front End Wizard. A number of RSSI readings are measured
across the switching range. These readings are then continually averaged to
produce the graph.
Important: After tuning the reciter front end, you must re-calibrate
the RSSI. This requires a signal generator. Otherwise the value
reported by the Service Kit will be in error and RSSI gating levels
will be incorrect.
You should aim to achieve a response that looks something like this:
Equipment ■Johanson tuning tool
■CTU
Receiver VCO tuning hole for
H band (400 - 520 MHz) and
K band (792 - 824 MHz)
Receiver VCO tuning hole for
B band (136-174 MHz) and
C band (174 - 225 MHz)

11 Tuning a UHF Receiver Front End © Tait Electronics Limited April 2006
Setup
To tune the front end of a UHF (H-band or K-band) receiver, follow
these steps.
1. Ensure you are already connected to the reciter (see “Connecting to a
Reciter Outside the Subrack” on page 5).
2. Select the Frequency Setup tab, and double-click Tune Receiver Front
End. The Tune Receiver Front End Wizard appears.
Note: If you haven’t adjusted the receiver lock band in the current
session, an alert appears, recommending that you run the Set
Receiver VCO wizard first. If the lock band needs adjusting, click
Yes and carry out that procedure first. If you are confident that the lock band
is correct, click No.
3. Connect the CTU’s noise source to the receiver input, turn the noise source
on, and then click Next.
4. Click Coarse (fast) and use the tuning tool to roughly adjust the front-end
helical filters on the receiver. As you do so, observe the graphical RSSI
readings across the lock band. Adjust to maximize the response across the
entire switching band.
Note: As the response gets flatter, you may find it helpful to select a
more sensitive scale, so that you can see the graphical reading in
more detail.
Use the tuning tools as follows.
6
4
3
1
2
5
1PC 2RS-232 cable 3Programming port
4CTU 5Noise source 6Reciter
First set
Second set
Helical
filters:

TB8100 Calibration Kit User’s Manual Tuning a VHF Receiver Front End 12
a. Insert the Johanson tuning tool into the first hole of the first (horizontal)
set. You can start with the hole on the left side and proceed along to the
hole on the right, or vice versa. On K-band reciters, the third hole tends
to tune with the slug well out of the filter body. Be careful not to
unscrew the slug completely.
b. Tune each of the resonators in the first set once to give the best response.
c. Insert the Johanson tuning tool into the first hole of the second (vertical)
set. You can start with the top hole and proceed down to the bottom
hole, or vice versa. (For hardware version 4.00 or earlier H-band reciters,
use the Murata tuning tool on this set instead, as instructed by the wiz-
ard.)
d. Tune each of the resonators in the second set once to give the best
response.
e. Repeat this procedure as necessary to refine the response.
5. Once you have roughly tuned the front-end helical filters, click Fine
(slow). Repeat the above procedure to fine tune the front-end helical filters
until the response is peaked in the middle of the lock band and not more
than -1 dB at the ends of the band.
Note: When using the Fine (slow) setting, you may notice a slight
delay as the reading from tuning the front-end helical filters takes
approximately one second to appear on the graph.
6. Click Finish. An alert appears, asking that you calibrate the RSSI. The icon
on the Frequency Setup tab indicates that this task is complete.
7. Re-calibrate the RSSI (see “Calibrating the RSSI” on page 19).
Tuning a VHF Receiver Front End
The second step in tuning a VHF reciter is to tune the receiver front end, by
adjusting trimmer capacitors. Tuning aims to maximise the receiver’s sensitivity
and to optimise its response across the lock band (switching range).
To help you do this, there is a graph of the RSSI readings in step two of the
Tune Receiver Front End Wizard. A number of RSSI readings are measured
across the switching range. These readings are then continually averaged to
produce the graph.
After tuning the reciter front end, you must re-calibrate the RSSI. This requires
a signal generator. Otherwise the value reported by the Service Kit will be
in error and RSSI gating levels will be incorrect.
You should aim to achieve a response that looks something like this:
Equipment ■Tuning tool

13 Tuning a VHF Receiver Front End © Tait Electronics Limited April 2006
■CTU
Setup
To tune a VHF (B-band or C-band) receiver front end, follow these steps.
1. Ensure you are already connected to the reciter (see “Connecting to a
Reciter Outside the Subrack” on page 5).
2. Select the Frequency Setup tab, and double-click Tune Receiver Front
End. The Tune Receiver Front End Wizard appears.
Note: If you haven’t adjusted the receiver lock band in the current
session, an alert appears, recommending that you run the Set
Receiver VCO wizard first. If the lock band needs adjusting, click
Yes and carry out that procedure first. If you are confident that the lock band
is correct, click No.
3. Connect the CTU’s noise source to the receiver input, turn the noise source
on, and then click Next.
4. Click Coarse (fast) and use the Murata tuning tool to roughly adjust the
four front-end trimmers on the receiver. You can do this in any order. As
you do so, observe the graphical RSSI readings across the lock band. Adjust
to optimise the response across the entire switching band.
Note: As the response gets flatter, you may find it helpful to select a
more sensitive scale, so that you can see the graphical reading in
more detail.
5. Once you have roughly tuned the trimmers, click Fine (slow). Repeat the
above procedure until the response is flat in the middle of the lock band and
not more than -1 dB at the ends of the band.
Note: When using the Fine (slow) setting, you may notice a slight
delay as the reading from tuning the trimmers takes approximately
one second to appear on the graph.
6. Click Finish. An alert appears, asking that you calibrate the RSSI. The icon
on the Frequency Setup tab indicates that this task is complete.
7. Re-calibrate the RSSI (see “Calibrating the RSSI” on page 19).
6
4
3
1
2
5
1PC 2RS-232 cable 3Programming port
4CTU 5Noise source 6Reciter

TB8100 Calibration Kit User’s Manual Adjusting the Exciter Lock Band 14
Adjusting the Exciter Lock Band
If you are preparing the base station for operation, adjusting the exciter lock
band is the third step in tuning the reciter. Alternatively, this procedure can be
performed independently of the other two calibration wizards on the
Frequency Setup tab. Adjusting the exciter lock band defines the range of
frequencies that the base station is able to transmit on.
Note: When performing this procedure, you don’t need to
terminate the exciter output port. An internal output pad means that
there is a good impedance match at this interface.
Equipment ■Tuning tool
■CTU
To calibrate the exciter lock band
1. Ensure you are already connected to the reciter (see “Connecting to a
Reciter Outside the Subrack” on page 5).
2. Select the Frequency Setup tab, and double-click Set Exciter VCO. The
Set Exciter VCO Wizard appears.
3. Enter the center frequency (which must be a multiple of 500 kHz) of the
lock band that you want to use, and click Next.
4. Insert the Murata tuning tool into the correct exciter VCO tuning hole (see
below) and adjust the trimmer until the actual band matches the desired
band. The bands turn green. Click Finish.
Once you have finished adjusting the exciter lock band, the icon on the
Frequency Setup tab indicates that this task is complete.
Trimmer holes for receiver
front-end tuning
(B band 136 - 174 MHz and
C band 174 - 225 MHz)

15 Selecting the Exciter Sub-band © Tait Electronics Limited April 2006
Selecting the Exciter Sub-band
The lock band of K-band and L-band exciters does not normally need
adjusting. Instead you select a sub-band that the reciter will operate on. These
exciters have two VCOs and the one you select determines the sub-band.
Equipment ■Murata tuning tool
■CTU
To select the exciter sub-band
1. Ensure you are already connected to the reciter (see “Connecting to a
Reciter Outside the Subrack” on page 5).
2. Select the Frequency Setup tab, and double-click Set/Select Exciter
VCO. The Set/Select Exciter VCO Wizard appears.
3. Select one of the two available lock bands and then click Next. This
specifies the lock band that the exciter operates in.
4. If the reciter RF board has been repaired, you need to adjust the lock band.
Insert the Murata tuning tool into the correct exciter VCO tuning hole (see
below) and adjust the trimmer until the actual band matches the desired
band. The bands turn green.
5. Click Finish.
Once you have finished, the icon on the Frequency Setup tab indicates that
this task is complete.
Exciter VCO tuning hole
for H band
(400 - 520 MHz)
Exciter VCO tuning hole for
B band (136-174 MHz)
and C band (174-225 MHz)
Exciter VCO tuning hole for
K band (850-869 MHz) and
L1 band (852-854 MHz). L2 not
used.
Exciter VCO tuning hole for
K band (762-776 MHz),
L1 band (928-930 MHz), and
L2 band (927-941 MHz)