14
FRONT PANEL OPERATION
Introduction
The parameters controlling the operation of the FS700 are displayed
and adjusted in a set of six menus. Each menu may have one or more
screens (two line displays) of data. Each screen may contain one or
more field (adjustable parameter). Pressing a menu button displays that
menu. The screens that belong to a menu may be displayed by
repeatedly pressing the menu button. The field that is adjustable is
denoted by a flashing cursor bar. The various fields may be selected by
pressing the FIELD key.
The data entry mode for each field is indicated by the mode LEDs
above the field key. If the NUM LED is lit the data is entered in numeric
format using the keypad. Pressing the EXC key terminates the entry.
Errors are corrected using the backspace (BSP) key. If the <> LED is
lit the field is changed with the cursor keys (up and down arrow keys). If
neither LED is lit the display may not be changed.
Occasionally, an error or informational messages will be displayed on
the LCD display. The display may be returned to the normal menu
display by pressing any key.
LORAN Tracking
The TRACKING and STATUS menus control the FS700's tracking of a
LORAN-C station. Adjustable tracking parameters are set in the
TRACKING menu, while tracking status is displayed in the STATUS
menu.
Overview
Most of the FS700's operation is completely automatic. First, choose a
GRI and enter it into the FS700. Refer to the LORAN chain map to
choose a GRI that has stations near the receiver. Then, LORAN-C
station selection, acquisition, and tracking can begin. Station selection
and search mode may be either manually or automatically controlled.
Station selection is the process of choosing a specific station in the
GRI for tracking. In AUTO station selection, the FS700 will choose and
track the station with the largest signal strength. AUTO selection is the
FS700's default mode, and is recommended for general use. The
FS700 may be set to track a specific station in the GRI. If the master
station is not detected there is no way to identify the stations and
manual station selection will fail. AUTO selection will pick the largest
signal even in the absence of the master.
The FS700's search mode controls the starting and stopping of
searches, and recovery from signal errors. In AUTO mode the FS700
will begin a search anytime that it is unlocked from a station. While in
MANUAL, the searches must be started by pressing the EXC key. The
FS700's default is AUTO. After power-on, an AUTO search will begin
after the oven oscillator warm-up period expires (the OVEN LED goes
off). A MANUAL search may be started at any time. However, if the
