AOR SDU5500 Manual page 16

Section 4-1
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 readout will display the current receive frequency of the AR5000 and
the RX readout will confirm AR5000.
Should any fault occur in connection with the AR5000 at this stage, the SDU5500 CPU will identify the
companion radio as "Other". In this case check the AR5000 baud rate setting (which should be
9600bps) and connection lead.
Warm Start
Once the SDU5500 has been configured for the AR5000 companion radio following a cold start (or any
other receiver in use), it will not be necessary to enter the receiver details again as long as the SDU5500
remains connected to power (presuming that you wish to continue using the same receiver type)... even
after the SDU5500 has been switched off and back on again.
AR5000 auto switch on
Once the SDU5500 is capable of operating from a warm start, the AR5000 will be switched on
automatically when the SDU5500 is powered up. The SDU5500 will attempt communication twice, the
first time the AR5000 will be switched on, the second will establish communication.
Cold start / Hot start
The initial display which appears on the LCD after switching on depends on whether the SDU5500 has
remained connected to a power supply since last use. When the cold start is performed (if power has
been removed), the SDU5500 will start with menu page 1 while menu page 4 will appear when the
SDU5500 is hot-started. Either way, shuttling from page-to-page is possible.
General operational notes
The AR5000 will now be operated from the front panel of the SDU5500, receive frequency, mode,
attenuator & tuning step size may be controlled. Only the MAIN DIAL, SUB DIAL, VOLUME, SQUELCH
and POWER controls of the AR5000 will be available during inter-connect with the SDU5500.
In order to keep the SDU5500 and AR5000 frequency readout in unison, the AR5000 is 'polled' once per
second, this is called "automatic renewal of centre frequency" (the poll may be paused during certain
menu conditions). In early AR5000 production, a small flick in s-meter may be noted during the 'poll',
should this present an annoyance on a particular transmission, consider temporarily selecting "Other"
receiver and using the SDU5500 as a passive bandscope with the AR5000.
The minimum specified tuning step size when used with the SDU5500 is 10 Hz (even though the
AR5000 can independently tune in 1 Hz steps). Any digits below 10 Hz will be ignored, the acceptable
step sizes being in the range 10 Hz to 999.95 kHz inclusive.
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