7. FISH FINDER (SOUNDER)
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[Zero Line Range]: This feature adjusts the transmission line so that the transmission
line disappears when the menu item [Zero Line Rejector] is turned on. Available with
DFF3 and DI-FFAMP. The setting range is 1.4 to 2.5 for DFF3; 1.4 to 3.8 For DI-
FFAMP. For a long tail, increase the value. If the transmission line does not disappear,
lower the TX power. Applicable to Network Sounder DFF3.
[Transducer Draft]: Set the distance between the transducer and the draft line to
show the distance from the sea surface (Setting range: 0.0 to 99.9 ft).
[Salt Water]: Select [ON] to use this equipment in salt water.
[Fish Finder Source]: elect the fish finder used.
[Transducer Setup]: Select the method to setup the transducer, by model, manually,
or TDID (transducer ID). See the installation manual for details.
[Transmission Format]: Select whether to transmit high frequency and low frequency
simultaneously or with a time difference (DI-FFAMP exclusive menu item). [Parallel]
transmits the frequency simultaneously. [Sequential] transmits with a delay between
transmissions. Use [Sequential] if [Parallel] is generating interference.
[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
fish finder and external fish finder other than DFF1-UHD)
[External KP]: Turn on to sync with external keying pulse. The default setting uses the
internal sync pulse. For external keying pulse synchronization, set this item to [ON].)
[Bottom Level HF (MF, 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 (MF, 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 fre-
quencies here.
[Auto Gain Offset HF (MF, LF)]: If the auto gain offset is wrong, or there is a differ-
ence in the gain between the low and high frequencies, set an offset here to balance
auto gain for the two frequencies. Auto adjustment of gain offset can also be done
from the Layers menu.
[STC HF (MF, LF)]: Delete unnecessary echoes (plankton, air bubbles, etc.) near the
surface 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 (MF, 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 frequen-
cy of your transducer by enough percentage points to remove the interference. (For
DFF3)
[TX Pulse HF (MF, 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
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