AOR SDU5600 Spectrum Display Unit Operating Manual

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5-7 Waterfall display facility
The SDU5600 is equipped with a waterfall facility which can display the variation of signal strengths in
conjunction with the time lapsed (as sweeps progress). Sixteen different colours are employed
dependant on signal strength, in the shape of a waterfall.
Press the FUNC + ˜ to start the waterfall display. The bottom half of the screen will be allocated to
the waterfall display and will build-up with time.
The waterfall display continues to operate being unaffected by...

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5-8  On/off of the displayed information
The companion receiver parameters
are usually displayed on the left side of
the LCD graticule.  The key sequence
FUNC + 5 (DISP) will toggle the display
of the companion receiver’s parameter
on / off.
When the calculation mode is in use,
the calculation data will be turned on or
off by the same key-in sequence.
By effective use of this facility, you can
view the signal activities easier on the
much less cluttered display area.
5-9  Beep alert
To toggle the...

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6.  Operating the SDU5600
This section will provide examples of operating the SDU5600 using the AR5000A+3 as companion
receiver. Refer to pages 10 to 12 of this manual for connection to the receiver.
Section 6, 6-1
6-1 Operate the SDU5600 with
the AR5000A+3.
Turn the SDU5600 on, which
is followed by the opening
message to confirm for
readiness.
Access the configuration menu by pressing the
FUNC + 4 to select the companion receiver.
Press the RX key, which displays the current
companion radio type...

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6-2  Monitor the VHF FM band in the spectrum analyser mode
Continue to operate the SDU5600 from section 6-1 where the SDU5600 / AR5000A+3  has been set
in the spectrum monitoring mode.
The example to the right is the actual
result which was obtained after
monitoring the signal spectrum at the
AOR headquarters in Tokyo. It indicates
the input signal being saturated,
resulting in some weak ghost signals
appearing at regular intervals close to
the floor level of the spectrum trace.
Adjust the input...

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6-3 Monitor the FM broadcast band in the step
resolution mode
The following information explains how to change the monitoring mode from
the default of spectrum analyser mode to the step resolution mode.
Press the FUNC + 2 (STEP), the SDU5600 will shift to Step Resolution mode
with the legend 
StepReso. appearing on the LCD. The display step will be
unchanged at this stage.
 
You may wish to change the display step to a 25kHz in order to make the task
of monitoring easier. Press the SPAN/STEP key,...

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6-4 Monitor the VHF air band in the channel scope mode.
The VHF airband is allocated over the wide frequency band, It is therefore impossible to display the
entire VHF airband on the SDU5600 at once. The channel scope mode however provides a very
convenient method of monitoring the channelised frequency band through the use of both the marker
and receive marker. Using this method, you can split the airband into small sections for quick
inspection.
Change of the monitoring mode
To change to Channel...

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6-5  Suitable applications of each monitoring mode
A summary of the three monitoring modes and suitable applications is given
here:
Spectrum analyser mode
This mode is the DEFAULT and most common monitoring mode among the
three. It is suited to the monitoring of permanent or intermittent signals or
noise.  The CF (centre frequency) and SPAN (visible bandwidth) are the main
criteria to be specified.
Step resolution mode
This mode is suited best to monitor signals which are allocated with certain...

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7. Useful Information
The SDU5600 has been designed to operate with a wide-band companion receiver such as the
AR5000A. Therefore, there are some differences in operating characteristics with the unit when
compared with the spectrum analysers which are designed for more general testing / measuring
applications. It is advisable that you take into account the following information while making yourself
familiar with the SDU5600.
Signal strength
The signal strength which the SDU5600 indicates is measured...

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8. SDU5600 Command List
The SDU5600 can be operated via PC using the RS232 port.
8-1 Communication parameter and connecting lead
The SDU5600 and a PC should be connected using a straight cable between
the [PC I/F] socket and the serial port of the PC. The SDU5600 port is MALE,
so the PC lead must have a female connector or a gender changer will have to
be employed.
Communications parameters of the SDU5600
Baud rate 9600bps
Data length 8 bit
Parity None
Stop bit 2 bit
Flow control RTS/CTS
8-2...

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8-3  Basic format of the command
Each command to be sent to the SDU5600 consists of 4 letters (upper case) in
ASCII code with appropriate parameters followed by .
Each letter represents the following:
(1) First letter Either W for write or R for read
(2) Second letter Line of command such as S for
spectrum analysis, V for visual
set-up, U for user interface and
I for information
(3 & 4) Third and Fourth letter Categories of each line of command
8-4 RS232 command list
Commands are divided into four...