AOR SDU5600 User manual

1
®
FFT spectrum display unit
SDU5600
OPERATING MANUAL
PROFESSIONAL SPECTRUM
DISPLAY UNIT FOR USE WITH
A COMPANION RADIO

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3
Index
Index
Safety notices ................................................................................................. 5
SDU5600 brief circuit description .................................................................... 6
LCD resolution ................................................................................................ 6
Block diagram ................................................................................................. 7
Introduction ..................................................................................................... 8
1 Controls and Descriptions ......................................................................... 9
1.1 Front panel ................................................................................................ 9
1.2 Rear panel ................................................................................................ 10
2 Connection ................................................................................................. 11
2.1 Connection with the power supply ............................................................. 11
2.2 Connection with the receiver ..................................................................... 11
3 Preparations ............................................................................................... 12
3.1 Configuration of the receiver ..................................................................... 12
3.2 Start-up ..................................................................................................... 12
4 Basics ......................................................................................................... 13
4.1 Control ...................................................................................................... 13
4.2 Display ...................................................................................................... 14
4.3 Main key layout ......................................................................................... 15
4.4 Clear (CLR) key ........................................................................................ 16
4.5 Default mode and clear mode ................................................................... 16
4.6 When the communication with the companion receiver has failed ............. 16
5 Configuration of the SDU5600 ................................................................... 17
5.1.1 Configuration (CONF) ............................................................................. 17
5.1.2 Applicable receivers ............................................................................... 18
5.2.1 Configuration of the receiver .................................................................. 19
5.2.2 Selecting the receive frequency .............................................................. 20
5.3 Setup of the monitoring mode ................................................................... 22
5.4 Basic setup for each monitoring mode ...................................................... 23
5.4.1 Spectrum analysers mode ...................................................................... 23
5.4.2 Step resolution mode ............................................................................. 24
5.4.3 Channel scope mode ............................................................................. 25
5.4.4 Common features shared by different monitoring ................................... 26

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Index
5.5 Marker ...................................................................................................... 28
5.6 Calculation facility ..................................................................................... 30
5.7 Waterfall display facility ............................................................................. 31
5.8 On/off of the display information ............................................................... 32
5.9 Beep alert ................................................................................................. 32
5.10 Factory default/reset ............................................................................... 32
6 Operating the SDU5600 ............................................................................. 33
6.1 Operate the SDU5600 with the AR5000A+3 .............................................. 33
6.2 Monitor the VHF FM band in the spectrum analyser mode ........................ 34
6.3 Monitor the FM broadcast band in the step resolution mode ..................... 35
6.4 Monitor the VHF air band in the channel scope mode ............................... 36
6.5 Suitable applications of each monitoring mode ......................................... 37
7 Useful information ..................................................................................... 38
8 SDU5600 Computer control ....................................................................... 39
8.1 Communication parameters and connecting lead ...................................... 39
8.2 Delimiter ................................................................................................... 39
8.3 Basic format of the command ................................................................... 40
8.4 RS232 command list ................................................................................ 40
Spectrum analysis ............................................................................... 41
Visual command .................................................................................. 43
User interface ...................................................................................... 44
General information ............................................................................. 46
Notes for programmers ........................................................................ 48
9 Specification .............................................................................................. 49

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Every effort has been made to make this manual correct and up to date. Due to continuous
development of the product and by error or omission, anomalies may be found and this is
acknowledged.
© This manual is protected by copyright AOR Ltd 2003. No information contained in this manual may
be copied or transferred by any means without the prior written consent of AOR Ltd. AOR and the ‘AOR
logo’ are trade marks of AOR Ltd. All other trade marks and names are acknowledged. E&OE
&Level of risk
As there SDU5600 is powered from 12V DC, there is little chance of serious injury as long as common
sense is applied.
Observe the polarity of connections if the supplied AC power unit is not being used. DC input is a
nominal 12V DC wired centre positive. Reverse polarity connection will damage the SDU5600 and
potentially could lead to the risk of fire or explosion under severe circumstances.
Carefully handle the AC plug of the supplied AC power unit to prevent touching the terminals when
inserting or removing from the AC socket. NEVER connect the SDU5600 directly to the AC supply.
SAFETY NOTICE - Always disconnect the power supply from the AC socket when not in use.
Explanation of risk warning mark
Whenever the book symbol &is used in this operating manual, an important point is being made which
may relate to risk of personal injury or damage to the unit if ignored.
When the pointing finger is used, the associated text provides useful operational information of
special note (such as a tip). No risk or personal injury or damage is associated.
Handling the SDU5600
Use a soft, dry cloth to gently wipe the SDU5600 clean, never use abrasive cleaners or organic solvents
which may damage certain parts. Treat the unit with care, avoid spillage or leakage of liquids into the
cabinet and power supply. Special care should be taken to avoid liquid entering around the keys, main
dial or via the connection sockets. Never push or knock the TFT LCD display screen which is very
fragile and sensitive to shock.
Special remarks
Do not use or leave the SDU5600 in direct sunlight (especially the TFT display). It is best to avoid
locations where excessive heat, humidity, dust and vibration are expected. Always keep the SDU5600
free from dust and moisture.
AC adaptor (power unit)
The SDU5600 may be provided with either a suitable AC / DC power unit. The SDU5600 is designed for
operation from a nominal 12V DC regulated power supply (12 to 14V is acceptable), which should be
capable of supplying a minimum of 1A continuous, ideally a 2A unit should be employed.
&Note: Never connect the SDU5600 directly to an AC supply.
The DC input socket uses a mini power connector (subject to EIAJ RC-5320A) and is wired centre
positive (+), the chassis of the unit is at negative ground. To minimise the potential for power cable
interference, it is suggested that a ferrite clamp be fitted to the connecting cable.
Other warnings
There are no internal operator adjustments. In the unlikely event of servicing being required, please
contact your dealer for technical assistance.
Should the SDU5600 appear to behave strangely, normal operation may easily be regained by resetting
the microprocessor. Simply power down the SDU5600 and disconnect the power supply... leave for 30
seconds then reconnect and power-up again.
It is possible to RESET the microprocessor, please refer to section 5-10, page 32 for further information.
If used with the AR3000A, a small modification is required to the receiver in order to provide the required
10.7 MHz IF output. If using the ICOM IC-R7100, the optional ICOM CT17 (RS232/CIV) interface is
required.
Safety notices

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Circuit description
SDU5600 Brief circuit description
The RF signal is fed by BNC socket into the SDU at a selected frequency of either 10.7MHz or 45.05MHz depending on the radio IF
frequency being used. This signal is split into two different signal paths depending upon which input frequency is selected. Both paths
are buffered and have Band Pass Filters with a bandwidth of +/-5kHz to eliminate unwanted signals outside of this range.
After the BPF, both signal paths join and are amplified by a single LNA (Low Noise Amplifier). The output signal feeds a pair of Dual
BalancedMixers.
Here the input RF signal is mixed with two orthogonal sinusoidal signals produced by the DDS (Direct Digital Synthesis) section to
give two resultant signals at audio frequencies (one used as real, one as imaginary). The gain of both signal paths is also controlled at
this point.
The audio level signals are fed through 80kHz LPFs (Low Pass Filters) and finally converted from Analogue into Digital signals before
being fed to the FPGA (Field Programmable Gate Array).
The digital signal is now processed by the DSP (Digital Signal Processor) to give an RGB Video output via the FPGA which drives a
colour TFT LCD display.
The DSP is controlled by the main CPU and its EEPROM memory. The front panel keypad switches and rotary encoder are fed to the
main CPU via a separate slave microprocessor on the front panel.
RS232 control and Receiver control ports connect (indirectly) to the main CPU.
A comprehensive power supply section has been used in the unit to give the required supply levels of 2.5v, 3.3v, 5v, 6v, 9.5v, 17v, -5v,
-7v and -15v. The input is protected for reverse current & unwanted RF and is internally fused.
LCD resolution
The LCD provides high resolution of 320 horizontal dots from the left to right edges of screen. As a result, there are about 40 steps
per graticule division with eight divisions making up the total width. The minimum displayed bandwidth is 160kHz and the maximum
displayed width is 10000 kHz (10 MHz) representing ± 5 MHz.
To calculate the LCD-step, divide the SPAN bandwidth in kHz by 320. Examples are as follows:
10000 kHz (10 MHz) 32.250 kHz
5000 kHz (5 MHz) 15.625 kHz
2000 kHz (2 MHz) 6.250 kHz
1000 kHz (1 MHz) 3.250 kHz
160 kHz (0.16 MHz) 0.500 kHz
It is possible to force the LCD-step to equal the receive tuning step using a similar process. Multiply the receive tuning step size in
kHz by 320 (dots) to obtain the required total span width in kHz.
For example, for a 5 kHz tuning and LCD step, 5 x 320 = 1600 kHz span
The following table presents commonly used step sizes:
0.5 kHz (minimum step size) 160 kHz (0.160 MHz)
5 kHz 1600 kHz (1.600 MHz)
6.25 kHz 2000 kHz (2.00 MHz)
9 kHz 2880 kHz (2.880 MHz)
10 kHz 3200 kHz (3.200 MHz)
12.5 kHz 4000 kHz (4.000 MHz)
20 kHz 6400 kHz (6.400 MHz)
25 kHz 8000 kHz (8.000 MHz)
31.25 kHz represents maximum span of 10000 kHz (10 MHz)

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Block diagram

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Introduction
Thank you for purchasing the SDU5600 FFT spectrum display unit. AOR was the
first company in the world to market a colour spectrum display unit (SDU5000) for
professionals and the top-end of hobbyist listeners. The SDU5500 followed adding
sophistication and the SDU5600 is truly a successor incorporating a high resolution
5 inch (127mm) colour TFT display featuring FFT signal analysis and built-in waterfall
display backed by the latest microprocessor technology to ensure high versatility and
reliability. To get the best possible results, we recommended that you read this manual
to fully familiarise yourself with the SDU5600.
Major features
The SDU5600 has been designed to be a highly effective spectrum monitor unit which
is capable of digitally processing the IF frequency taken from a communications
receiver through the use of FFT for professional quality spectrum analysis. The 5 inch
TFT colour LCD screen is used to achieve the finest possible resolution.
The SDU5600 has been primarily designed to complement to the AOR AR5000 series
of receivers in terms of operational features and cosmetic design. Also other types of
receiver such as the AOR AR-ONE, AR3000A and AR8600MK2 and ICOM ICR8500 +
ICR7100 can be used (modification and additional hardware required).
A wide variety of monitoring modes are available with the convenience of operators in
mind which include Step Resolution Mode for general monitoring or Channel Scope
Mode for monitoring the channelised signals. It also incorporates a Waterfall facility
(as commercial grade spectrum analysers do), to display the changing conditions of
signal spectrum with varying colours in a form of waterfall.
Following the success of its predecessors, SDU5000 and SDU5500, the new
SDU5600 provides the same AV, Peak Hold and Peak value readings which are
downloadable to the PC via a communications port. The SDU5600 can be remote
controlled through the use of the communications port to further expand the range of
applications for spectrum monitoring.
Supplied accessories
1 x SDU5600 main unit
1 x BNC RF patch lead for IF connection
1 x DB9 patch lead for serial communications - male to male
1 x Handbook
1 x AC power supply
Introduction & preparation

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1 Controls and Descriptions
Control and display of the SDU5600 is via the front panel with the rear panel
providing connections for the companion receiver, power and computer.
1-1 Front panel
LCD: Thelargehighresolution 5inch colourTFT displayprovides alloperational informationand
spectrumdisplay. Thebackground is black with green graticule and white lettering for critical
information. Menu items are varying shades of blue, the valid indicator is green with the function
indicatorin ‘reverselettering’ yellow. Themarker lineis whiteand changesto purplewhen exactly
positionedover a graticule line. The colours cannot be changed.
Power switch: Press once to latch the switch in, switching on the SDU5600. To switch off the
SDU5600, press the switch a second time, the switch latches outward. When switched on, the LCD
briefly displays the model and firmware numbers.
Tilt bail bar: A tilt bail bar is provided under the front panel (on the bottom case half) so that the
SDU5600may be tilted upward at the frontto improve visibility in certaininstallations.
Soft function keys: Each one of these three ‘soft keys’ has multiple roles as indicated on the LCD
screendepending on the circumstances inoperation.
Special function keys: These three keys positioned to the left of the DIAL are to be used solely for
specificpurposes suchas toenter acentre frequency, frequencyspan, displayincrement andinput
sensitivity.
Dial: The DIAL is a rotary control and is used to move the cursor, to make a selection or to move the
marker/centrefrequency.
Main keypad: Used to enter numeric information, to control the companion receiver, etc. When a
valid key press is sounded, the SDU5600 will provide a high pitch ‘beep’ (happy), if an invalid key
press is made, a low pitched ‘beep’ (sad) is sounded. The beep can be toggled on/off using the key
sequence FUNC + 6(BEEP), the default is on.
Section 1, 1-1

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1-2 Rear panel
RF Input socket: The IF output (10.7 MHz / 45.05 MHz) from a suitable receiver such as the
AR5000A should be connected to this BNC input socket using a 50 OHM patch lead constructed of
quality coaxial cable such as RG58/U, UR43, UR76 etc. A suitable BNC-BNC lead is supplied.
PC I/F socket (male): A controlling computer may be connected to this 9-pin D-type male socket.
Ensure this socket is only commented to a computer for hands-off operation, although it is very
unlikely that incorrect connection to a computer or similar device would cause damage.
RX connection socket (female): The supplied 9-way to 9-way ‘D-type’ male to male lead is used to
connect the SDU5600 to the AR5000A receiver. If used with another receiver, a suitable serial-
adapter or connecting cable will be required. Wiring should be as follows:
SDU5600 9-pin male 9-pin male (AR5000A) 25-pin male (AR3000A)
223
332
5 5 7 GND
774
885
12V DC input socket: The supplied power unit is terminated with a centre positive (+) polarity.
Theplug specificationfollows EIAJRC-5320A (Class-4).
There are four screw holes (unused), two on each side of the cabinet.
They are a provision for rack mount application. Size of the screw is M4x8.
Section 1-2

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2 Connection
2-1 Connection with the power supply
Where possible, use the supplied AC/DC power unit. Make sure the main switch of the SDU5600 is
inthe OFFposition before connecting the power supply.
2-2 Connection with the receiver
Thishand bookis compiled mainly referring to the AR5000A series receiveras theprincipal
companion receiver. Any reference to other types of receiver will be made separately when and
wherenecessary.
Make sure that both the SDU5600 and AR5000A are switched off. Perform the connection of the
bothunits referring to the photo shown here,using the IF signal connectionpatch lead and RX serial
connection lead. The following table shows the correct connection of each plug & socket.
AR5000A SDU5600
IF signal patch lead IFOUT RF IN
RX serial lead REMOTE RX CTR
If you wish to use a receiver other than the AR5000A
proceed to connect the 10.7MHz IF output from the
receiver to the RF IN BNC socket on the rear of the
SDU5600... the AR3000A will require a modifica-
tion in order to provide a suitable signal. Connect
the RS232 data lead from the receiver to the RX
CTR socket of the SDU5600, the companion
receiver‘thinks’ it is communicating with a
computer, butis actuallycommunicating
with the SDU5600 (the ICOM ICR7100
requiresthe optionalICOM CT17
CIV/RS232interface).
RX Menu Applicable receiver Requirements
AR5000 AR5000A+3 Configure the IF output
AR5000A
AR5000+3
AR5000
AR3000A AR3000A Modifications to the IF output circuit
(AR3000 not applicable)
AR8600 (10M) AR8600MK2 Modifications to the output circuits
on all modes other than WFM
AR8600 (45M) AR8600MK2 Modificationof TV converter
AR8200 AR8200MK2 Modification of TV converter and
AR8200MK3 use of 8200PC interface
AR-ONE AR-ONE Configure the IF output
RFU5600 RFU5600
IC-R8500 IC-R8500 Use of batch lead with RCA/PHONO plug
Configure the IF output
IC-R7100 IC-R7100 Use of batch lead with RCA/PHONO plug
Use of CT-17 interface
Section 2, 2-1, 2-2
The SDU5600 offers a RX selection menu
whereby you can select other receivers which
you wish to operate with the SDU5600.
The table here indicates the type of receiver in
the RX selection menu, applicable receivers
and other requirements.

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3 Preparations
3-1 Configuration of the receiver
The SDU5600 is primarily designed to operate with the receiver at 9600bps. The companion
receiver’s baud rate has to be configured to the same rate. Some type of receivers may require
additionalmodifications orinterface, etc,which areexplained asfollows:-
AR5000 series: Configure the selection of external IF output and baud rate as per the following
table (refer to pages 29 & 30 sections 6-18 & 6-19 of AR5000 English language operating manual):
External IF output Select[EXT-IF 1]
RS232C Select9600bps
Afterthe configurationshave been completed place
the receiver in VFO mode.
AR3000A: The AR3000A has to be modified by
AOR in order to produce a 10.7MHz IF output for
use with the SDU5600. The remote switch on the
rear panel has to be set to ON position, and baud
rate needs to be 4800bps (receiver’s default).
Ascreened RS232connecting lead configured for
9-25 pin with male-pins at both ends must be used.
AR8200MK3: Configure the baud rate to 9600bps
by referring to pages 109 & 110 section 14-6 of the
AR8200English language operating manual. Place
the receiver in VFO mode. For connection to the
SDU5600 the 8200PC interface lead is required
alongwith agender changer. The AR8200MK3 has
to be modified by AOR to produce a 10.7MHz IF
output.
AR8600MK2: Configure the baud
rate to 9600bps by referring to page
108 section 14-5 of AR8600 English
languageoperating manual. Place
the receiver in VFO mode. For
connection to the SDU5600 the
suppliedconnecting leads have to be
used.To enableIF outputin ALL
MODES (rather than just WFM), refer
to page 18 for further information on
themodifications required.
3-2 Start-up
ALWAYS switch the receiver on before the SDU5600 and make any necessary adjustment of
communicationspeed andIF output(assuming therelevant modificationshave beencarried outand
connecting leads are in place as appropriate). Then switch on the SDU5600 by depressing the
POWER switch on the lower left of the front panel. The SDU5600 will power up, while the operating
system powers up you may notice horizontal lines on the LCD, this is normal. The SDU5600 will
briefly display the model number and firmware version called the ‘opening message’ before the
standard display. The SDU5600 is ready for operation.
Section 3, 3-1, 3-2

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4 Basics
This section describes the front panel controls, detail of LCD display and introduces the method of
operationemployed bythe SDU5600 prior to further configurations and monitoring operations.It is
advisablethat you read this section carefully before proceedingto explore the full capabilityof the
SDU5600.
4-1 Control
Power switch: Press once to latch the switch in, switching on the SDU5600. To
switch off the SDU5600, press the switch a second time, the switch latches outward.
When switched on, the LCD briefly displays the model and firmware numbers.
Soft function keys: Each one of these three ‘soft keys’ has
multiple roles as indicated on the LCD screen depending on the
circumstancesinoperation. Throughout thismanual, physical
keys and ‘soft keys’ are not differentiated when describing key
sequences.
Special function keys: These three keys positioned to the left of the DIAL are to be
used solely for specific purposes such as to enter a centre frequency, frequency span,
displayincrementand input sensitivity.
Dial: The DIAL is a rotary control and is used to move the cursor, to make a selection or to
movethe marker/centrefrequency.
Main keypad: Used to enter numeric information, to control the companion receiver, etc.
Section 4, 4-1
BACKUP
The SDU5600 is configurable in various ways to the requirements of the operator. All configuration data is
stored into FLASH ROM when the SDU5600 is switch off. However, in the event of failed connection /
communications with the companion receiver, a beep will be sounded and the SDU5600 will revert to the
factorydefaultparameters.

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4-2 Display
This section explains what you can expect to see on the SDU5600’s monitor screen
using Spectrum Mode as a typical example. The screen will appear differently when
switched to other operating modes.
(1) Centre frequency - CF: The centre frequency reading is shown in MHz, providing
a minimum resolution of up to 10Hz.
(2) Frequency span - SPAN: The centre frequency appears in the middle of the display
with frequency extending to the left and right. The total frequency spread from the left
through centre to the right is referred to as the total SPAN and is indicated in MHz.
The maximum span is 10MHz and minimum is 0.160MHz (160kHz). The horizontal
scale is divided into 320 increments.
(3) Start frequency - SF: Displays the start frequency on the left of the graticule for
calibration purposes. Usually the start frequency is calculated based on the centre
frequency and bandwidth selected, but in certain menus can be directly programmed.
(4) End frequency - EF: Displays the end frequency on the right of the graticule for
calibration purposes. Usually the end frequency is calculated based on the centre
frequency and bandwidth selected, but in certain menus can be directly programmed.
(5) Resolution band width - RBW: The sampling filters may be selected from four
bandwidths of 4kHz, 32kHz, 64kHz and 128kHz. The smaller bandwidths will provide
greater detail of individual signals but wanted transmissions are easier to initially
identify using a wider filter.
Section 4-2
Relationship between Frequency span and Frequency step
The LCD provides high resolution of 320 steps from the left to right edges of the screen (x-axis). A frequency bandwidth
represented by one step is calculated as STEP EQUALS SPAN DIVIDED BY 320, this being automatically done by the
SDU5600 in the Spectrum Mode. Refer to item (6) ‘Frequency step’ on page 15.

15
(6) Step frequency - STEP: This value is displayed in kHz and indicates how wide one step
represents out of the 320 steps across the X-axis. The example of page 14 shows 31.250kHz as one
step which is obtained by taking the SPAN of 10MHz and dividing it by 320, the result is 31.250kHz -
since the X-axis is 10MHz wide in this example. In the Step resolution mode, it is possible to specify
thefrequency bandwidthto be ‘one step’ rather than an often seeminglyarbitrary value.
(7) Operation mode - OP.MODE: This legend indicates which one of three operating modes is
selected,there are threepossibilities:
Spectrum Spectrumanalyser mode
StepReso Stepresolution mode
Channel Channelscope mode
(8) Marker + (9) Marker information: The marker (8) is a vertical line drawn on the LCD which can
bemoved across the horizontal axis. The marker iscapable of providing the instantaneousreading of
information where the marker is placed such as (9) frequency or signal strength of marker location.
In the marker menu, in addition to the instantaneous reading of marker information, the peak
search facility is provided. Any signals which are out of scale cannot be read. It is necessary to
adjustthe gain for input signal level, the displayed signalappears verticallywhile thecalibration lines
ofthe graticule are represented horizontally.
(10) Valid indicator: This indicates which method of data input is valid. When a DOT is shown, the
main dial is operational whereas when SQUARE ¢is displayed, entry through the keypad is
operational.
(11) Receiver information: This section of theLCD provides various operating conditions of the
companionreceiver suchas receivingfrequency,modulation mode,tuning stepand ATT on/off.
The information can be toggle on and off via the key sequence FUNC 5 (DISP)
(12) Signal indicator + (13) Level indicator: The X-axis(horizontal line)indicates frequency, and
Y-axis(vertical line) indicates signal strength,so thefrequency spectrum ofthe receivedsignal
isindicated on the screen.
TheY-axis (vertical line) is split into six segments witheach segmentrepresenting a10dB. The level
indicatorreads the input sensitivity which is shown along theY-axis andthe levelis adjustable in four
levelsby alteringthe built-in amplifier (AMPLITUDE). The X-axis is split into eight segments
indicatingthe frequency span (bandwidth) in use. Themarker is designed to moveacross the one
segment by ONE full rotation of the main dial. To move the marker from one edge to another requires
EIGHT rotations of the main dial.
4-3 Main key layout
Themain keypad consistsof 20individual
keys, each conveniently located for ease of
operation:
êFunction key (FUNC) on the top right
êReceiver control keys (RX CTRL)
on the right
êEnter key (ENT) on lower right
êClear key (CLR) on bottom left
The FUNC key enables activation of the second function keys. When pressed the ‘FUNC’ legend
appears in the top left corner of the LCD in reverse contrast YELLOW text.
Section 4-2, 4-3

16
4-4 Clear (CLR) key
The clear key (CLR) acts as back-space key to cancel each proceeding key
entry of numeric information (1to 0, decimal-point) during entry of the start
/end frequency, entry of input sensitivity / trigger level or the marker and
numeration in the calculation mode. Pressing the clear key with no proceeding
key entry will abort the sequence. Pressing A.CLR (FUNC +CLR) will clear all
proceeding numeric entries and end the sequence.
Pressing the clear key (CLR) repeatedly in the calculation mode, marker mode
(except the instantaneous reading) and waterfall display mode will eventually
return operation to the default mode, see below.
4-5 Default mode and clear mode
The SDU5600 is configurable with a wide range of parameters. It is possible to
bring the SDU5600 to the default mode as described in the table by repeatedly
pressing the clear key. Definition of the default mode
Marker mode Instantaneous reading
Calculation mode None
Waterfall mode No display
Pressing the clear key (CLR) will not affect the proceeding key entry in the
monitoring mode (spectrum analyser mode, step resolution mode, channel
scope mode), frequency span / frequency step, marker frequency and
demodulation mode.
4-6 When the communication with the companion receiver has failed
The SDU5600 will try to re-establish the communication with the receiver for a
couple of seconds. If unsuccessful the SDU5600 will revert itself to the default
mode as 4-5.
Default mode in the monitoring mode
When the communication between the SDU5600 and the companion
receiver has been disrupted while operating in the channel scope mode
the SDU5600 will automatically switch itself from the channel scope
mode to spectrum analyser mode, ending up in the default mode.
Section 4-4, 4-5, 4-6

17
5. Configuration of the SDU5600
The SDU5600 is designed to configure a wide range of parameters for ease of operation.
5-1-1 Configuration (CONF)
Thissection explains how to configure the operating environment underwhich theSDU5600 isused.
Selection of the receiver, Plotting pattern and Frequency direction are to be configured. Press
the FUNC key followed by the 4 (CONF) key to assign the soft keys as the following diagram.
For selection of the receiver press the RX key.
The box where the type of receiver is shown will be in reverse contrast. Rotate the
main dial to scroll through applicable receivers one after another. Press the ENT key
(kHz key or MHz key) to determine the companion receiver. There are no other features
of the RX configuration menu.
For selection of the plot pattern press
PLOT key. The present pattern is shown
either as Paint or Outline. If you wish to
change the pattern from the one to
another press the PLOT key. There are no
other features of the PLOT configuration
menu.
For selection of the frequency direction
press the F-DIR key. The present
selection is shown either as Reverse or
Normal. Press the F-DIR key to toggle
between Reverse and Normal. This
configuration is valid only when the
companion receiver has been selected as
Other(10M) or Other(45M), it is not
applicable when a ‘known’ valid radio is
connected. There are no other features of
the F-DIR configuration menu.
Thisillustration shows PAINT mode:
Thisillustration shows OUTLINEmode:
Section 5, 5-1-1

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5-1-2 Applicable receivers
This is a list of compatible receivers which are selectable from the SDU5600
companion receiver menu:
Receiver Selection menu Applicable receiver Remarks
AR5000 AR5000/+3 Use of EXT-IF port
AR5000A/+3
AR3000A AR3000A 10.7MHz IF mods required
Use of 4800bps
AR8600(10M) AR8600MK2 IF mods required if used
in all modes
AR8600(45M) AR8600MK2 45MHz IF mods
(TV mods) required
AR8200 AR8200MK3 45MHz IF mods
(TV mods) required
AR-ONE AR-ONE
RFU5600 RFU5600 Built-in RF adaptor
IC-R8500 IC-R8500
IC-R7100 IC-R7100 CT-17 required
Other(10M) Receiver with Frequency direction
10.7MHz out selectable
Other(45M) Receiver with Frequency direction
45.05MHz out selectable
Non-AOR receivers are excluded from our terms and condition which are applicable
to AOR receivers in respect of electrical performance and specifications.
For modifications, please contact AOR:
Japan
AOR Ltd, Tel: [phone] www.aorja.com
Europe
AOR (UK) Ltd, Tel: [phone] www.aoruk.com
Americas
AOR USA INC., Tel: [phone] www.aorusa.com
Section 5-1-2

19
5-2-1 Configuration of the Receiver
Thissection explains how to configurethe
companion receiver itself. Note that this section
will not apply when Other(10M) or Other(45M)
has been selected inthe receiverselection
menu,or communicationhas not been correctly
establishedbetween the SDU5600 and companion
receiver.
On the right of the main keypad there are three
control keys which directly affect the operation of
thecompanion receiver, these areMODE (receive
mode), STEP (tuning step) and ATT (attenuator).
Theiroperation incompanion withthe SDU5600
isdescribed below.
Receive (Demodulation) mode - MODE
This key is used to select the receive mode of the companion receiver (NFM, AM etc). Press the
MODE key to activate the RX.MODE menu, the corresponding LCD legend flashes in reverse
contrast. Rotate the main dial to scroll the various receive modes. Press theENT key to accept the
displayedthe receive mode.
Frequency step - STEP
This key is used to select the tuning step size of the
companion receiver . Press the STEP key to
activatethe RX.STEP menu, the corresponding
LCDlegend flashes in reverse contrast. Tapin the
step size via the ten-keys then press the ENTkey.
Any step size which is not supported by the
companion receiver will be rejected by the
SDU5600 and the LCD will revert to the previous
stepsize.
Attenuator - ATT
This key is used to activate or deactivate the attenuator of the companion receiver as a toggle, each
push of the ATT key will alternate On/Off and the corresponding LCD legend RX.ATT will confirm the
status.
AUTO mode of the companion receiver
Whenthecompanion receiverisequipped withanauto mode feature wheretheIF filter bandwidth
and receive mode can be changedindependently (such asthe AR5000A), theSDU5600 cannot
make changes to the IF bandwidth. For this reason, it is suggested that auto mode be used or the
bandwidthselectedmanually ifonly onereceivemode isto be usedwhile operatingwiththe SDU5600
in the current session.
Section 5-2-1
Revert to the parameters which have been previously configured
êPress FUNC +S.MODE/MODE to revert to the previously selected receive mode.
êPress FUNC +S.STEP/STEP to revert to the previously selected receive tuning step size.
êNote,thesefacilities do notoperate once theSDU5600has been switchedoff andon.
Value of the attenuation (amount of attenuation)
Theamountof attenuationis determined bythe attenuator ofthe companionreceiver. WiththeAR5000
seriesreceiverthe attenuationcan be manuallyselected from thereceiver’ frontpanel.However whenthe
attenuator is switched on from the SDU5600’s front panel it will select only the AUTO position of the
receiver.

20
5-2-2 Selecting the receive frequency
Thissection will explain how to select and monitorthe receive frequency of thecompanion receiver.
It must be noted that the SDU5600 employs the following principle:
Spectrum / Step Resolution - Receive Frequency (RX.FREQ) = Centre Frequency (CF)
Method 1: While the SDU5600 is in SPECTRUM MODE (default when first switched on) or STEP
RESOLUTION MODE, use the ten keys to directly enter the desired centre frequency, followed by
the kHz or MHz key to complete the sequence.
Method 2: Usually the main dial changes the position of the marker, however press the
CENTRE FREQ. soft key to display the CF legend in reverse contrast (as diagram
below), now you can alter the centre frequency by turning the main dial as well as via
the keypad . The frequency step in use is as selected by the SDU5600 (not the
frequency step selected in the receiver), 20kHz in the example below. While tuning the
receive frequency or CF by rotating the main dial there may be up to approx. 2
seconds of delayed response between the SDU5600 and the companion receiver.
Notes: If the companion receiver is of interactive type such as the AR5000 series the centre frequency can be operated
via the receiver’s tuning dial (or keypad depending on level on inter-operability). The frequency step in such use is as
selected by the receiver (the diagram below shows a tuning step of 100kHz).
Receive frequency cannot be adjusted when the companion receiver has been selected as Other(10M) and Other(45M),
the soft keys change colour to dark blue and the main keypad will not initiate frequency entry... producing an error beep
if the feature is enabled. This is also true when communication between the SDU5600 and the companion receiver has
been disrupted.
Pressing the ten keys to enter the centre frequency in the following instances will be void:
ê When the FUNC legend is shown in reverse contrast.
ê When the companion receiver has been selected as Other.
ê When the SDU5600 is in the marker mode following the key press of FUNC + MK.F keys.
ê While the SDU5600 is in a process of entering calculation data.
Once the entry by the ten-keys has been made, entry by the main dial is invalid. To resume the entry by the main dial press the CLR
key once followed by the CENTRE FREQ. key.
Centre frequency and Receive frequency step:
ê The frequency step shown on the SDU5600’s screen is valid when operated by the main dial.
ê The frequency step selected by the companion receiver is valid when the SDU5600 is being controlled by the
companion receiver.
FUNC + 1
Spectrum
mode
FUNC + 2
Step
Resolution
mode
Section 5-2-2