User manual: Installation and Operation of Direction Finder System RHOTHETA RT-600 / SAR-DF 517
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2.1.2
Main Pages Selection
There are two main pages which can be selected:
The DF (Direction Finder) Page is the page in which all relevant operational information is shown, depending on
the kind of signal which shall be received.
The MEM (Memory) Page is the page in which memorized operational frequencies can be modified.
Page Selection
(1)
The >Page< rotary switch is used to select the active page.
(2)
The active page is highlighted with dark background
(3)
The inactive page, which may be selected, is written in dark
letters on bright background.
2.1.3
Dimming function
The background of the LC-graphic display is equipped with a LED-array, whose brightness may be adjusted
continuously (from 5 to 100%). Dimming will be performed in an exponential curve, thus allowing very accurate
adjusting under night-conditions
Dimming Setup
(1)
Pressing the >Rep/DIM< button for a short time is activating the
dimming setup mode.
(2)
Brightness information, as percentage value from 5 % to 100 % in
steps of 5 % is displayed instead of the “Page” field in the upper right
corner of the display.
(3)
The >Page< rotary switch can be used to adjust the display
brightness. Right-hand turn will increase the value in steps of 5
percent, while a left-hand turn will reduce the value in steps of 5
percent.
After ca. 3 seconds of user inactivity, the display falls back into the prior main page. The adjusted brightness of
the display will remain stored after switching off the unit.
Dimming of legends may be performed in two ways, using the internal dimming settings as for the LC-display
itself, or using an external (remote) dimming voltage provided by the aircraft.
Internal dimming (on display unit) of legends:
Internal dimming is always active, if the external dimming input is not connected, or if applied voltage is
below 1 V DC. (Refer to the wiring plan). The legends are dimmed in the same manner as the LC display.
External (remote) dimming of legends:
As soon as there’s a voltage >1 V DC at the dimming input, the brightness of legends is controlled
externally by an analog signal. (Refer to the wiring plan and to the operating/setup-menu description).
