Display - AOR SDU5600 Operating Manual

Section 4-2

4-2 Display

This section explains what you can expect to see on the SDU5600's monitor screen
using Spectrum Mode as a typical example. The screen will appear differently when
switched to other operating modes.
(1) Centre frequency - CF: The centre frequency reading is shown in MHz, providing
a minimum resolution of up to 10Hz.
(2) Frequency span - SPAN: The centre frequency appears in the middle of the display
with frequency extending to the left and right. The total frequency spread from the left
through centre to the right is referred to as the total SPAN and is indicated in MHz.
The maximum span is 10MHz and minimum is 0.160MHz (160kHz). The horizontal
scale is divided into 320 increments.
(3) Start frequency - SF: Displays the start frequency on the left of the graticule for
calibration purposes. Usually the start frequency is calculated based on the centre
frequency and bandwidth selected, but in certain menus can be directly programmed.
(4) End frequency - EF: Displays the end frequency on the right of the graticule for
calibration purposes. Usually the end frequency is calculated based on the centre
frequency and bandwidth selected, but in certain menus can be directly programmed.
(5) Resolution band width - RBW: The sampling filters may be selected from four
bandwidths of 4kHz, 32kHz, 64kHz and 128kHz. The smaller bandwidths will provide
greater detail of individual signals but wanted transmissions are easier to initially
identify using a wider filter.
Relationship between Frequency span and Frequency step
The LCD provides high resolution of 320 steps from the left to right edges of the screen (x-axis). A frequency bandwidth
represented by one step is calculated as STEP EQUALS SPAN DIVIDED BY 320, this being automatically done by the
SDU5600 in the Spectrum Mode. Refer to item (6) 'Frequency step' on page 15.
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