AOR SDU-5500 Operating Manual

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Section 1, 1-1
(1)  SDU5500 Index
1 Index  ............................................................................................ 1
1-1 Introduction  .................................................................................. 1
1-2 Taking care of the unit  .................................................................. 2
1-3 Power requirements  ..................................................................... 2
1-4 Operating anomalies...

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Section 1-2, 1-3, 1-4, 1-5
1-2  Taking care of the unitThere are no internal operator adjustments.  In the unlikely event of servicing being required, please
contact your dealer for technical assistance.
Do not use or leave the SDU5500 in direct sunlight (especially the LCD).  It is best to avoid locations
where excessive heat, humidity, dust and vibration are expected.  Always keep the SDU5500 free from
dust and moisture.  LCD contrast & selection of negative / positive display may be adjusted via...

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1-6  Technical high-lights
•
 Menu driven operation
All facilities are accessible via dedicated keys and on-screen menus.
• Full inter-connection with the AR5000
The AR5000 can be operated from the SDU5500 providing selection of centre frequency, receive
mode, etc. Any frequency spotted and monitored by the SDU5500 may be received by the AR5000
straight away.
• Direct reading of receive frequency and input level
By placing the cursor on any spot frequency, you can read its frequency and input dBm...

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(2)  Controls and connections
2-1  Front panel controls
The front panel of the SDU5500 is dominated by the large LCD.  Controls are ‘grouped’ to assist efficient
operation, there are a total of 18 keys in addition to the on/off switch and spin wheel dial.
1  Power switch
Press once to latch the switch in, switching on the SDU5500.  To switch off the SDU5500, press the
switch a second time, the switch latches outward.
2  Liquid Crystal Display
The large high resolution back-lit LCD defaults to white...

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2-2  Rear PanelThe rear of the SDU5500 features two 9-pin D-type sockets for connection to the companion radio and
PC, a BNC socket is provided for IF input and a d.c. input socket for power.  Blanking plates cover the
unused sections of the rear panel, these are for possible future expansion / options.
1  DC 12V (d.c. input power
socket)
Connect a suitable regulated 12V
d.c. power supply to this socket
using the supplied connection lead,
the power supply should have a
minimum continuous capacity of...

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If connecting to a PC, observe the following connection requirements, use a straight RS232 lead
(avoid null modem leads, these will not operate):
SDU5500 9-pin PC 9-pin PC 25-pin
2     2     3
3     3     2
5     5     7  GND
7     7     4
8     8     5
The SDU5500 is fully controllable by PC via the built-in RS232 interface, this includes all keyboard
operations and down loading of the displayed data.
  Communication parameter
  Data length 8 bit
  Parity bit None
  Stop bit 2 bit
  Baud rate 9600...

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Middle, graphical display
The middle section of the LCD is mapped into a graticule of ten boxes horizontally and five boxes high.
The horizontal scale is determined by the SPAN (see later under LCD resolution).  The vertical scale is
calibrated in 10dBm increments ranging from:
• Hi gain: Baseline is -90dBm with the top line representing -40dBm.
• Low gain: Baseline is -60dBm with the top line representing -10dBm.
Directly above the graticule, the current “Marker” frequency is displayed in MHz with the...

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(2)  SPAN Total displayed bandwidth
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 kHz.  The maximum span is 10000 kHz (10 MHz) and minimum is 1 kHz.
(3)  RBW Resolution Band Width
Two input filters may be toggled for sampling, 5 kHz and 30 kHz.  Greater detail is obtained by 5 kHz,
often with a lower baseline while 30 kHz...

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To cancel AVR, press [AVR] a second time.
(13)  Marker Marker / Peak / CPeak
Selection of Marker / Peak / Continuous Peak is made via menu 5 and indicated on the LCD.
In normal spectrum mode, “Marker” is displayed and the spin wheel dial may be used to move the
marker position indicated by a vertical bar with triangular symbols.  The frequency and strength of traces
may be read in this manner.  The frequency and level can only be read within the confines of the
graticule (out of range reading cannot be...

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3-2  SDU5500 menu overviewOperation of the SDU5500 is controlled by seven menus numbered 1 to 7.  The menu number is always
displayed in the bottom left of the LCD, even when information is being keyed.  The radio type is defined
in menu 1.  Use the PREVIOUS MENU  PREV  and NEXT MENU  NEXT  keys to move between
menus.
& Note: As a short-cut to menus, it is also possible to use the numeric ten-key pad... so that 
immediately accesses menu 1,  accesses menu 5 etc.
Some omission and duplication appears...