AOR SDU-5500 Operating Manual

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Rotate the spin wheel dial to highlight “AR5000”
then press 
.
The message “AR5000 Connected” will be briefly
displayed on the SDU5500, if an error message “RX Disconnected” appears, re-check the connections
and the RS232 parameters of the AR5000 (the SDU5500 may try two or three times to connect to the
AR5000).
Other items such as  PLOT ,  CONT ,  B/W  can
be ignored unless necessary. The frequency sweep
direction  FDIR  is default and cannot be changed.
3)  Go to menu 2, use the  PREV   NEXT  keys...

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Push the  CF  key and enter the required centre
frequency in MHz format.  In this example select
95 MHz followed by 
.
The LCD legend “CF : 95.00000MHz” confirms
entry.  Leave the RBW set to 30 kHz.
6)  Go to menu 5, if necessary use the  PREV
NEXT  keys or press the numeric key 
.
This menu is used to define the operation of the
frequency marker.
Now the LCD should be displaying a centre
frequency of 95 MHz with a spread either side (the
screen representing 90 MHz to 100 MHz from left to
right).  In...

33
& Note:  In step resolution mode, the minimum displayed frequency will be the lower limit plus one
LCD-step/radio step, in the above example with a centre frequency of 95 MHz, 10000 kHz span and 30
kHz RBW this will be 90.10000 MHz with the top frequency being 100.00000 MHz.
7)  Go to menu 7, if necessary use the  PREV
NEXT  keys or press the numeric key 
.  This
menu is used in step resolution mode to move the
centre frequency.
  Moves the centre frequency up by half the span width, in this example...

34
2)  Go to menu 1, use the  PREV   NEXT  keys or
press the numeric key 
.  Push the  RX  key to
access the companion radio configuration menu.
Rotate the spin wheel dial to highlight “AR5000”
then press 
.  The message “AR5000 Connected”
will be briefly displayed on the SDU5500, if an error
message “RX Disconnected” appears, re-check the
connections and the RS232 parameters of the
AR5000 (the SDU5500 may try two or three times to
connect to the AR5000).
Other items such as  PLOT ,  CONT ,  B/W  can be...

35
Another menu will appear “Channel Scope Step
Freq(kHz)” inviting you to enter the channel step size
using kHz format.  In this example input 25 kHz
  
A third menu will appear “Channel Scope End
Freq(MHz)” inviting you to enter the upper frequency
limit in MHz format.  In this example input 124 MHz
   
The maximum span width (difference between upper and lower frequency limit) is 5000 kHz minus one
channel step.
& Note: Should you wish to later change the start / end frequency or channel step, use the...

36
If the incoming signal is greater than -40dBm, switch-on the companion radio’s attenuator (in the case of
the AR5000 this is via menu 2).
Additional facilities are provided by menu 5 and menu 6, these include MK-RF where the marker is
moved to receive frequency so that activity traces may be monitored by a single key press.
7)  Go to menu 7, if necessary use the  PREV   NEXT  keys or press the numeric key 
.  This menu
is used in channel step mode to move the “RF” marker (effectively tune the receive...

37
(6)  Special considerations
Electrical performance:  The SDU5500 is designed to operate in conjunction with a companion radio
as a complete system unlike an all-in-one spectrum analyser.  You are reminded of the following points:
Displayed signal level
The signal level which the SDU5500 provides is always at the RF input of the SDU5500, not the signal
level at the companion radio aerial input.
AGC
The signal level of the SDU5500 may fluctuate when the companion radio is tuned or the received signal...

38
(7)  Computer control information
The SDU5500 is fully controllable by PC via the RS232 socket, no specific hardware interface is
required, just a straight RS232 cable.  All keyboard operations may be mimicked via a PC and display
data may be downloaded for reconstruction in the PC enabling recording of activity and historic analysis.
The SDU5500 is equipped with an RS232 port in addition to the connection port for a companion radio.
The two connectors are the same, please refer to section 2-2 of this...

39
The second example uses Windows HyperTerminal, Plot mode is set to outline “WVPM2”, plot mode is
read to confirm the command “RVPM” and the response to the request is displayed “VPM2”:
S = Spectrum analysis
Function Read/Write Command category Type of command Parameter Example Response
CENT FREQ SET W S CF Min - Max WSCF10.7 [CR] + or ?
CENT FREQ READ R S CF N/A RSCF [CR] SCF84.3 +
SPAN SET W S SP Min - Max WSSP1000 [CR] + or ?
SPAN READ R S SP N/A RSSP [CR] SSP1000 +
RBW SET W S BW 1=5kHz
2=30kHz...

40
V = Visual command
Function Read/Write Command category Type of command Parameter Example Response
PLOT MODE SET W V PM 1=PAINT
2=OUTLINE WVPM1 [CR] + or ?
PLOT MODE READ R V PM N/A RVPM [CR] VPM1 +
FDIR SET W V DD 1=NORMAL
2=REVERSEWVDD1 [CR] + or ?
FDIR READ R V DD N/A RVDD [CR] VDD1 +
LCD CONTRAST SET W V CL 0 - 160 WVCL50 [CR] + or ?
LCD CONTRAST READ R V CL N/A RVCL [CR] VCL50 +
LCD DISPLAY MODE W V RV 1=NORMAL
2=REVERSE WVRV1 [CR] + or ?
LCD DISPLAY MODE R V RV N/A RVRV [CR] VRV1 +
SEND VISUAL...