Step Resolution Mode - AOR SDU5500 Manual

Section 5-2, 5-3
Rotate the spin wheel dial to move the marker onto
any active trace, the frequency may be read directly
in MHz format next to the legend "Marker" and the
signal level will be displayed alongside in dBm.
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-CF where the marker
is moved to centre frequency so that activity traces
may be monitored by a single key press.
Note: In spectrum analyser mode, the
minimum displayed frequency will be the lower
limit plus one LCD-step, in the above example
with a centre frequency of 95 MHz, 10000 kHz
span and 30 kHz RBW this will be 90.03290 MHz
with the top frequency being 100.00000 MHz.

5-3 Step resolution mode

In 'step resolution mode', ONLY the wanted steps are checked for activity rather than the whole band,
this is particularly useful when you know the tuning steps used on a particular band and don't want to
view in-between the channel allocations. To achieve this, the LCD-step is automatically forced to equal
the tuning step of the companion radio. You cannot manually set the SPAN, by necessity it has to be
calculated by the SDU5500.
As an example of usage, monitor the FM broadcast band using step resolution mode
with the AR5000.
1) Connect the AR5000 with the SDU5500 referring
to the section 4-1 of this operating manual. First
switch on the AR5000 then the SDU5500. Unless
the AR5000/SDU5500 combination has been
previously configured, the SDU5500 will default to
"Other" companion radio.
2) Go to menu 1, use the PREV NEXT keys or
. Push the RX key to
press the numeric key
access the companion radio configuration menu.
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