How To Reduce Second-Trace Echoes; Watchman - Furuno 1835 Operator's Manual

1. DESCRIPTION OF OPERATION
1.32

How to Reduce Second-trace Echoes

Echoes from very distant targets can appear as false echoes (second-trace echoes)
on the screen. The second-trace echo occurs when the return echo is received one
transmission cycle later, or after a next transmission of radar pulse.
1. Press the MENU key to open the menu.
2. Use the Cursorpad (
3. Use the Cursorpad (
key.
4. Use the Cursorpad (
5. Press the MENU key to close the menu.
1.33

Watchman

The Watchman sounds the buzzer to tell the operator to check the radar display. The
radar transmits for one minute and then goes into standby for the selected time inter-
val. If the target alarm is active and a target is found in the alarm zone, Watchman is
cancelled, and the radar transmits continuously.
Watchman
starts
In standby, the timer near the <WATCH> label at the center of the screen counts down
the remaining time until the transmission. When the set time interval has passed, the
audio alarm sounds, the timer disappears and the radar transmits for one minute. After
one minute, the audio alarm sounds and the watch alarm timer again begins the count-
down sequence.
If you press the STBY/TX key before the set time interval comes, the radar goes into
transmission.
1-40
TX repetition
Actual range
Second-trace echoes
or ) to select [Echo] and press the ENTER key.
or ) to select [2nd Echo Rejector] and press the ENTER
2nd Echo Rejector options
or ) to select [Off] or [On] then press the ENTER key.
*
Tx ST-BY
5,10 or 20 min.
1 min.
* Beep sounds just before radar transmits
or goes into standby.
How watchman operates
Second-trace
echo
False echo
range
*
*
Tx
ST-BY
1 min.
5,10 or 20 min.
*