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7. FISH FINDER (SOUNDER)
7-19
[Transducer Setup]: Select the method to setup the transducer, by model, manually,
or TDID (transducer ID). See the installation manual for details.
[Transmission Power]: Interference can appear on the screen when the fish finder
on your ship and another ship have the same TX frequency. To prevent this interfer-
ence, lower your TX power and ask the other ship to lower their TX power. (Internal
sounder and external sounder other than DFF1-UHD)
[External KP]: Turn on to sync with external keying pulse. (For external sounder)
[Bottom Level HF (LF)]: The default bottom level setting (0) determines that two
strong echoes received in sequence are bottom echoes. If the depth indication is not
stable in the default setting, adjust the bottom level here.
[Gain Offset HF (LF)]: If the gain setting is wrong, or there is a difference in the gain
between the low and high frequencies, you can balance the gain for the two frequen-
cies here.
[Auto Gain Offset HF (LF)]: If the auto gain offset is wrong, or there is a difference in
the gain between the low and high frequencies, set an offset here to balance auto gain
for the two frequencies.
[STC HF (LF)]: Delete unnecessary echoes (plankton, air bubbles, etc.) near the sur-
face that hide the fish near the surface. The setting range is 0 to 10, and 0 is off. 10
deletes unnecessary echoes from the surface to approximately 16 ft. Make sure you
do not use more STC than necessary, because you can erase the small echoes near
the surface. (For DFF3, DFF1-UHD)
[Frequency Adjust HF (LF)]: You can adjust the TX frequency of both the low- and
high-frequency transducers. Use this feature when your fish finder and another fish
finder operate on the same frequency, causing interference. Change the frequency of
your transducer by enough percentage points to remove the interference. (For DFF3)
[TX Pulse HF (LF)]: The pulse length is automatically set according to range and
shift.Use a short pulse for better resolution and a long pulse when detection range is
important. To improve resolution on zoom displays, use [Short 1] or [Short 2]. [Short
1] improves the detection resolution, but the detection range is shorter than with [Std]
(pulse length is 1/4 of [Std]). [Short 2] raises the detection resolution, however detec-
tion range is shorter (pulse length is about 1/2 of [Std]) than [Std]. [Std] is the standard
pulse length, and is suitable for general use. [Long] increases the detection range but
lowers the resolution (about 1/2 compared to the [Std] pulse length). (For DFF3)
[Rx Band HF (LF)]: The RX bandwidth is automatically set according to pulse
length.To decrease noise, select [Narrow]. For better resolution, select [Wide]. (For
DFF3)
[Temperature Port]: Select the data source for water temperature. (For DFF3,
DFF1-UHD)
[MJ]: The water temperature data from the water temperature/speed sensor
[Low Frequency]: The low frequency measured water temperature
[High Frequency]: The high frequency measured water temperature
[Set Hardware to Factory Default]: Select this menu item to restore default settings
for the unit selected in [Fish Finder Source].
[Reset Default Settings]: Select this menu item to restore default settings for the
[Sounder] menu.