Suppressing Interference (Adjust Freq.); Getting Sharper Display Pictures (Tx Pulse Width) - JRC JFC-130 Instruction Manual

< Suppressing Interference (ADJUST FREQ.)
When the approach of other boats or the engine noise from your own boat
gives interference to the screen beyond correction by the technique
introduced earlier, they can be suppressed by fine-tuning the transmitter
frequency. See page 25 "Canceling Interfering Signals (INTERFERENCE)."
Adjust frequency in a range of ±10kHz at 200kHz and 75kHz, or a range of
±5kHz at 50kHz, 38kHz, and 28kHz.
To suppress interference, follow these steps:
1.
Press the
fishfinding menu.
2.
Using the or
the MARK key.
3.
Press the or
groups.
4.
Press the or
5. Repeat steps 3 and 4 to adjust the other group of frequencies as
needed.
6.
Press the key to return to the fishfinding menu.
MARK
7.
Press the GRAPH key to return to the fishfinding display.
< Getting Sharper Display Pictures (TX PULSE WIDTH)
You can get more accentuated or sharper display pictures by varying the
transmitted pulse width. The transmitted pulse width is selectable from two
choices: long and short. A longer (wider) pulse width could provide a more
crisp picture of smaller fish schools.
To change the transmitted pulse width, follow these steps:
1.
Press the
fishfinding menu.
2.
Using the or
3.
Press the or
4.
Press the key to return to the fishfinding display.
GRAPH
With a narrow range setting, a long transmitted pulse width could
prolong the zero line, detracting from the distance resolution of
the pictures.
42
Operation
and keys at the same time to call up the
key, move to "3.ADJUST FREQ." and press
key to select between high and low frequency
key to adjust the frequencies.
and keys at the same time to call up the
key, move to "4.TX PULSE WIDTH."
key to move to "LONG" or "SHORT."
1.COLOR REJ. ≫
2.WHITE LINE ≫ LO 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 3.ADJUST FREQ.
ADJUST TX FREQUENCY
HI FRQ
▲ -80 ±0 +80
▼
LO FRQ FREQ. 200.0KHz
MARK : RETURN TO F/F MENU
ADJUST TX FREQUENCY Submenu
1.COLOR REJ. ≫
2.WHITE LINE ≫ LO 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
4.TX PULSE WIDTH
HI FRQ OFF
HI FRQ OFF