Instruction Manual
RA51/52/53/54/55 INSTRUCTION MANUAL – 05    v 
CHAPTER 5 OPERATION ................................................................27 
Basic operation of Radar--------------------------------------------------------------------------- 27 
5.1  Powering ON and OFF ---------------------------------------------------------------------- 27 
5.2  Adjusting contrast and brilliance of the screen, and key-backlight--------------- 27 
5.3  Basic Operations------------------------------------------------------------------------------ 28 
5.3.1  Turning On and Off---------------------------------------------------------------------------------------------28 
5.3.2  Transmitting------------------------------------------------------------------------------------------------------28 
5.3.3  Adjusting contrast and brilliance of the screen, and key-backlight ---------------------------------28 
5.3.4  Changing the range scale (RANGE UP, RANGE DOWN) -------------------------------------------28 
5.3.5  Automatic adjustment (AUTO) ------------------------------------------------------------------------------29 
5.3.6  Sensitivity adjustment (GAIN) ------------------------------------------------------------------------------- 29 
5.3.7 Removing Sea clutter (STC) ------------------------------------------------------------------------------------30 
5.3.8  Removing rain and snow clutter (FTC)-------------------------------------------------------------------- 30 
5.3.9  Man Over Board (MOB)---------------------------------------------------------------------------------------30 
5.4  Soft Key Functions---------------------------------------------------------------------------- 31 
5.4.1  Bearing measurement (EBL1)-------------------------------------------------------------------------------31 
5.4.2  Bearing measurement (EBL2)-------------------------------------------------------------------------------31 
5.4.3  Distance measurement (VRM1) ----------------------------------------------------------------------------31 
5.4.4  Distance measurement (VRM2) ----------------------------------------------------------------------------31 
5.4.5  Measuring the angle between two points (FL EBL2) --------------------------------------------------31 
5.4.6  Measuring the distance between two points (FL VRM2)----------------------------------------------32 
5.4.7  Changing the Soft Key function grouping (NEXT)------------------------------------------------------32 
5.4.8  Temporarily erasing heading marker (HDG OFF)------------------------------------------------------ 33 
5.4.9  Using parallel cursor (///CSR) -------------------------------------------------------------------------------33 
5.4.10  Establishment of the indication of the RANGE RINGS (RINGS) -----------------------------------33 
5.4.11  Variable range function (VAR RNG) -----------------------------------------------------------------------33 
5.4.12  Changing the display modes (MODE)---------------------------------------------------------------------33 
5.4.13  Guard Zone (GZ) -----------------------------------------------------------------------------------------------33 
5.4.14  Off Center (OFF-C) --------------------------------------------------------------------------------------------33 
5.4.15  Setting the SLEEP mode (SLEEP)------------------------------------------------------------------------- 34 
5.4.16  Tuning adjustment (TUNE)-----------------------------------------------------------------------------------34 
5.4.17  Echo expansion (ST) ------------------------------------------------------------------------------------------34 
5.4.18  Displaying track of targets (TRACK)-----------------------------------------------------------------------35 
5.4.19  Enlarging a selected area (ZOOM) ------------------------------------------------------------------------35 
5.4.20  Increasing transmitter average power (S/L)--------------------------------------------------------------35 
5.4.21  Switching the screen (SEL WIN) --------------------------------------------------------------------------- 35 
5.4.22  Reversing the screen color (PICTURE)-------------------------------------------------------------------36 
5.4.23  Change to PPI screen (PPI) ---------------------------------------------------------------------------------36 
5.4.24  Change to SEMI3D/PPI screen (SEMI3D) ---------------------------------------------------------------36 
5.4.25  Change to PPI/PPI screen (PPI/PPI) ----------------------------------------------------------------------36 
5.4.26  Change to PPI/NAV screen (PPI/NAV) ------------------------------------------------------------------- 36 
5.4.27  Change to ALL PPI screen (ALL PPI) ---------------------------------------------------------------------37 
5.4.28  Change to ALL PPI/PPI screen (ALL PPI2)--------------------------------------------------------------37 
5.5 MENU Operation -------------------------------------------------------------------------------- 38 
List of MENU ---------------------------------------------------------------------------------------------------------------38 
5.5.1 Mark Menu ---------------------------------------------------------------------------------------------------------- 39 
5.5.1.1  Bearing measurement (EBL1)---------------------------------------------------------------------------------------------------39 
5.5.1.2  Determining distance (VRM1) ---------------------------------------------------------------------------------------------------39 
5.5.1.3  Bearing measurement (EBL2)---------------------------------------------------------------------------------------------------40 
5.5.1.4  Determining distance (VRM2) ---------------------------------------------------------------------------------------------------40 
5.5.1.5  Measuring the distance between two points (VRM2, FL VRM2)--------------------------------------------------------40 
5.5.1.6  Measuring the angle between two points (EBL2, FL EBL2) -------------------------------------------------------------40 
5.5.1.7  Erasing the heading marker temporarily (HDG OFF)----------------------------------------------------------------------41 
5.5.1.8  Using parallel cursors (///CSR)--------------------------------------------------------------------------------------------------41 




