AOR SDU5500 Manual page 9

To cancel AVR, press [AVR] a second time.
(13) Marker Marker / Peak / CPeak
Selection of Marker / Peak / Continuous Peak is made via menu 5 and indicated on the LCD.
In normal spectrum mode, "Marker" is displayed and the spin wheel dial may be used to move the
marker position indicated by a vertical bar with triangular symbols. The frequency and strength of traces
may be read in this manner. The frequency and level can only be read within the confines of the
graticule (out of range reading cannot be made).
"Peak" is displayed when peak hold is activated, the maximum strength of incoming signals will be
frozen on the LCD until the peak facility is disengaged (finishing the current session) or SDU5500
switched off. The spin wheel dial may be used to hop between peaks in order of amplitude.
When "CPeak" is selected, the marker automatically hops to the largest new signal once a sweep has
completed, the frequency of the transmission is displayed to the right of the "CPeak" legend. If you wish
to monitor the automatically identified transmission, press [MK-CF] before a new sweep completes, this
MOVES THE MARKER TO CENTRE FREQUENCY where it may be monitored through the companion
radio.
(14) Signal display graticule
Received frequencies are plotted on the horizontal scale and signal strength on the vertical scale,
showing the over-all effect of signal activity over the given frequency bandwidth (span).
The bottom horizontal line is the 'baseline'. When signals are encountered, they produce vertical lines,
the higher the line, the stronger the signal. A 50dB range is provided by the graticule which is divided
into 10dB increments.
•
Hi gain: Baseline is -90dBm with the top line representing -40dBm.
•
Low gain: Baseline is -60dBm with the top line representing -10dBm.
By carefully selecting the gain, it is possible to obtain a total of 80dB between the two settings
(from -90dBm to -10dBm).
(15) Receive Marker
A vertical dotted line with 'outline triangle markers' indicates the receive frequency when using channel
scope mode. This is the frequency to which the companion radio is tuned and monitoring.
(16) Menu number
The current menu number (for each of the seven menus) is indicated in the lower left corner of the LCD.
Use the PREV NEXT keys to move between menus or as a short cut, press the wanted menu
number using the ten-key pad.
(17) Function keys
Six function keys are presented horizontally underneath the graticule, each being assigned with a
specific task. The 'soft key labels' will be displayed above the function keys on the LCD page-by-page
when the menu is scrolled.
Section 3-1
9