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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, 10 MHz being swept in about two seconds... sampling every 30 kHz.
Selection of 5 kHz will provide a slower trace update, 10 MHz being swept in about six seconds...
sampling every 5 kHz. This provides greater accuracy and lower baseline, making signals easier to see.
The balance between speed / resolution will depend upon the type of operation employed. Also, with a
wide span of around 10 MHz, each LCD-step is about 32 kHz (refer to the LCD resolution table) which
makes use of the 5 kHz RBW setting of little advantage in real terms.
(4) Making the SDU5500 ready for operation
It is possible to configure the SDU5500 for operation with a number of companion radios, the following
provides common set-ups.
4-1 Configuration of the AR5000 companion radio
•
Connect a suitable power supply
using the d.c. lead provided.
Ensure the correct polarity is
observed, the stripe signifies
positive. (In certain market areas,
a suitable power supply may be
provided).
•
Connect the 9-pin to 9-pin
connection lead between the RX
CTR socket of the SDU5500 and
REMOTE socket of the AR5000.
•
Connect the 50 OHM BNC patch lead between
the RF IN socket of the SDU5500 and the IF OUT socket of the AR5000.
Cold start
It is important that the AR5000 (or AR5000+3) is switched on FIRST, press the POWER switch of the
AR5000 so that the display appears on the radio. The AR5000 must be set to 9600bps baud rate
(FUNC CONFIG UP UP UP SUB DIAL 9600bps ENTER), on earlier production units, check that the
delimiter is set to CR+LF. Ensure that the AR5000 is in VFO mode (VA, VB, VC, VD, VE).
Now switch on the SDU5500. The first time the SDU5500 is switched on, or whenever power is
removed from the SDU5500, a COLD START sequence needs to be followed. This involves selecting
the required receiver via the SDU5500 companion radio configuration menu. As long as power is not
removed from the SDU5500 (even though it may be switched off with the power feed still connected),
the SDU5500 will remember which companion radio is in use.
Note: The SDU5500 CPU draws a very small current for backup purposes even though the
SDU5500 power switch is off.
Section 3-3-3, 4, 4-1
15
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