AOR SDU-5500 Operating Manual

11
Channel scope mode (CHANL)
1 PREV RX PLOT CONT B/W NEXT
2 PREV MODE    - ATT GAIN NEXT
3 PREV SPECT STRES CHANL    - NEXT
4 PREV FREQ    - RBW    - NEXT
5 PREV MKR PEAK CPEAK MK-CF NEXT
6 PREV MAX AVR    -    - NEXT
7 PREV    -     - NEXT
‘Other’ companion radio
1 PREV RX PLOT CONT B/W NEXT
2 PREV    - STEP    - GAIN NEXT
3 PREV SPECT STRES    -    - NEXT
4 PREV CF SPAN RBW FDIR NEXT
5 PRE MKR PEAK CPEAK MK-CF NEXT
6 PREV MAX AVR    -    - NEXT
7 PREV  NEXT
1 11 1
1Menu 1
PREVMove to previous menu...

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3 33 3
3Menu 3
PREVMove to previous menu
SPECTPlaces the SDU5500 into spectrum
analyser mode (default)
STRESStep resolution mode
CHANLChannel scope mode (not available
in ‘Other’ radio operation)
NEXTMove to next menu
4 44 4
4Menu 4
PREVMove to previous menu
CFReceive frequency, enter via the
ten keys in MHz.
FREQIn channel scope mode the legend
“FREQ” is displayed.  This is used to
access the sub menu to define
start / end / step setting.
SPANWhen using SPECTRUM DISPLAY
MODE “SPECT”, the viewable...

13
6 66 6
6Menu 6
PREVMove to previous menu
MAXWhen “MAX” is selected, the maximum
height of traces are frozen on the
display.  This will result in ‘peaks’
where transmissions have taken place,
one side effect is that the baseline will
tend to build-up a 5 to 10dB solid bar
due to random background noise.
This is a useful facility to ‘trap’
occasional transmissions over a long
time-scale and to check on band
allocation for transmission licence
issuers.  Press  MAX a second time to
restore a normal trace....

14
3-3  Important considerations
3-3-1  LCD resolution
The LCD provides high resolution of 304 horizontal dots from the left to right edges of screen.
As a result, there are about 30 steps per graticule division with ten divisions making up the total width.
The relationship between frequency and LCD-step is determined by the programmed SPAN width.
Span is set up in menu 4 while in SPECTRUM DISPLAY mode “OP.MODE : SPECT”.  The minimum
displayed bandwidth is 1 kHz (+/- 500Hz) and the maximum displayed...

15
It is most important to set up the step size appropriately.  If you are using the AR5000 companion radio
with receive mode set to AUTO, the step size will be taken care of automatically by the receiver’s built in
factory programmed bandplan (specific to each market area)... this is the ideal companion to the
SDU5500.
3-3-3  Significance of RBW (Resolution Band Width)
RBW sets the SDU5500 input filter and ‘sampling’ rate, either 5 kHz or 30 kHz.  Selection of 30 kHz will
provide a faster trace update,...

16
The SDU5500 LCD will display various details.  Under the item “RX” (third line down from the top left of
the LCD), “Other” radio will be displayed with the CF (centre frequency) of 10.7 MHz.
Ensure that menu item “1” is displayed in the lower left corner of the LCD, if not use the  PREV
(previous) and  NEXT  keys.  Press  RX  to display the COMPANION RADIO configuration menu.
Use the spin wheel dial to highlight “AR5000” then press .  The legend “AR5000 Connected” will
briefly be displayed then the CF...

17
Receive mode
When the AR5000 receive mode is set from the SDU5500, the following results:
SDU5500 setting AR5000 display IF bandwidth
WFM FM 220 kHz
NFM FM 15 kHz
AM AM 6 kHz
LSB LSB 3 kHz
USB USB 3 kHz
CW CW 3 kHz
AUTO AUTO Depends upon bandplan
& Note: The AR5000 does not have a specific legend for WFM, IF bandwidth beyond 30 kHz
becomes WFM.
IF output
The AR5000 IF output setting is automatically configured when the SDU5500 & AR5000 communicate
for the first time, thus overwriting any manual...

18
& Note:  Although the earlier AR3000 (not AR3000A) may be modified to provide a 10.7 MHz IF
output, the microprocessor is not capable of communicating with the SDU5500, this limits its
effectiveness.
The RS232 baud rate of the AR3000A is set to 4800bps at the factory.  However a ‘dip switch’ is
provided on the reverse of the AR3000A microprocessor / display PCB, tucked in the corner directly
behind the x10 TUNING button.  There are two switches in this PCB area, the momentary action switch
is for CPU...

19
Use the spin wheel dial to highlight “AR3000A” then press .  The legend “AR3000A Connected” will
briefly be displayed then the CF readout will display the current receive frequency of the AR3000A and
the RX readout will confirm AR3000A.  Should any fault occur in connection with the AR3000A at this
stage, the SDU5500 CPU will identify the receiver as “Other” being connected.  In this case check the
AR3000A baud rate setting (which should be 9600bps) and connection lead.
Warm Start
Once the SDU5500 has...

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4-3-1  Example set-up for the ICOM IC-R7100 receiver
Step 1. For transceive ON
On the ICOM receiver, press and hold both “3” and “ENT” keys and switch the power switch ON.
Switch the receiver OFF again.
Step 2. For baud rate of 9600
On the ICOM receiver, press and hold both the “5” and “ENT” keys and switch the power switch ON.
Switch the receiver OFF again.
4-3-2  Example set-up for the ICOM IC-R8500 receiver
Set the R8500 by accessing the ICOM initial set mode as per page 30 of the ICOM operating...