JRC JFC-130 - Preventing Interruption by Bubble (TX CYCLE MODE); To Inhibit the Display of the Quasi Sea-Bottom Image (ADJUST TX CYCLE)

Operation
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Preventing interruption by Bubble (TX CYCLE MODE)
The transmission cycle and the chart feed timing are normally synchronized
with each other, but they can be unsynchronized to make the sounder more
resistant to the interruption by bubble. Remember, however that in shallow
seas this setting is prone to pick quasi sea-bottom echo.
To switch the transmission cycle and the chart feed timing, follow these
steps:
1.
Press the
and keys at the same time to call up the
fishfinding menu.
2.
Using the
or key, move to “5.TX CYCLE MODE.”
3.
Press the
or key to move to “SYNC” (synchronous) or
“ASYNC” (asynchronous).
4.
Press the
GRAPH
key to return to the fishfinding display.
“ASYNC” is useful when the chart feed speed is reduced to l/3 or
lower.
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To inhibit the display of the quasi sea-bottom image (ADJUST TX CYCLE)
When the echo sounder is used with a shallow range, a quasi sea-bottom
image may be displayed at an intermediate depth between the zero line and
the sea bottom with a response that is weaker than that of the real sea
bottom.
If this quasi sea-bottom image is obstructive for looking at the echo sounder
image, adjust the transmission period on item “6.ADJUST TX CYCLE” of
the fishfinding menu.
To adjust the transmission period, operate as follows:
1.
Press the
and keys at the same time to call up the
fishfinding menu.
2.
Using the
or key, move to “6.ADJUST TX CYCLE.”
3.
Press
or key to adjust the transmission period. The set
value for transmission period adjustment varies from 0 to 100, where
the quasi-echo of the sea bottom is more largely inhibited as the set
value increases.
4.
Press the
GRAPH
key to return to the fishfinding display.
1.COLOR REJ. ≫
2.WHITE LINE ≫ LO FRQ OFF HI FRQ OFF
3.ADJUST FREQ. ≫ LO FRQ 50.0 HI FRQ 200.0
4.TX PULSE WIDTH LONG SHORT
5.TX CYCLE MODE SYNC. ASYNC.
▲ 6.ADJUST TX CYCLE 0
▼ 7.ＰＤＣ HI FRQ Ａ Ｂ Ｃ Ｄ
LO FRQ Ａ Ｂ Ｃ Ｄ
8.ADC MODE BLU 1 2 3 4 5 STD 7 8 RED
9.STC MODE 50 100 150 200 (m)
10.EXT INPUT DISP OFF DISP ON
11.SIG.PROCESS OFF 1 2
12.SCROLL STEP 1 2 3
GRAPH : RETURN TO F/F
MARK : GOTO SUB MENU≫
Fishfinding Menu
5.TX CYCLE MODE
1.COLOR REJ. ≫
2.WHITE LINE ≫ LO FRQ OFF HI FRQ OFF
3.ADJUST FREQ. ≫ LO FRQ 50.0 HI FRQ 200.0
4.TX PULSE WIDTH LONG SHORT
5.TX CYCLE MODE SYNC. ASYNC.
▲ 6.ADJUST TX CYCLE 0
▼ 7.ＰＤＣ HI FRQ Ａ Ｂ Ｃ Ｄ
LO FRQ Ａ Ｂ Ｃ Ｄ
8.ADC MODE BLU 1 2 3 4 5 STD 7 8 RED
9.STC MODE 50 100 150 200 (m)
10.EXT INPUT DISP OFF DISP ON
11.SIG.PROCESS OFF 1 2
12.SCROLL STEP 1 2 3
GRAPH : RETURN TO F/F
MARK : GOTO SUB MENU≫
Fishfinding Menu
6.ADJUST TX CYCLE