Navnet TZ3 touch User manual

KEY PULSE INTERFACING

Introduction
Fish finders are an essential tool for anglers, as they can help to locate fish and identify their
depth. However, fish finders can also interfere with each other, causing crosstalk. Crosstalk is
the unwanted transfer of signal from one fish finder to another. This can make it difficult to see
fish on the screen, as the signals from the other fish finders can be misinterpreted as fish
targets or completely interfere with the proper signals. Crosstalk is considered “noise” or
unwanted signal.
Keying Pulse (KP)
Keying pulse is a blanking pulse which is a technique that can be used to reduce crosstalk
between fish finders. The keying pulse is a pre-transmission signal from the transmitting
“master” sounder to tell the other connected fish finder to turn off its reception during the
transmission period so not to receive the interfering signal. This handshaking or coordination
between sounders will prevent crosstalk. Many times, crosstalk can be managed by simple
“interference rejection” filters on the receiving sounder. KP is a method to eliminate the
possibility of crosstalk.
Advantages of KP
•Improved signal-to-noise ratio: Key pulse can help to improve the signal-to-noise
ratio of the returned echoes, making it easier to see fish by reducing noise.
•Reduced clutter: Key pulse can help to reduce clutter on the screen by eliminating
cross talk between two connected sounders, making it easier to see fish.
Disadvantages of KP
•There will be slight negative impact on the sounders transmission rate, as it causes a
slight delay due to the needed coordination time.
•Extra circuitry in the sounder is required to support this coordination along with
additional wiring between both KP compatible fish finders.
STOP: Furuno advises attempting to mitigate interference using settings like “interference
rejection” before resorting to the costs of incorporating KP interconnections. Unless the
interference is of sufficient magnitude to outweigh the drawbacks of implementing KP, most
users typically deem it unnecessary.

Table of Contents:
Section 1: Wiring
1.1: DFF3D to DI-FFAMP
1.2: DFF3-UHD to DI-FFAMP
1.3: DFF3D to TZT3
1.4: DFF3-UHD to TZT3
Section 2: Initial Setup
2.1: Settings for DI-FFAMP
2.2: Settings for DFF3D/DFF3-UHD
Section 3: Notes, Considerations and Examples
3.1: Notes and Considerations
3.2: KP Examples
Section 4: Drawings
4.1: DFF3D to DI-FFAMP
4.2: DFF3-UHD to DI-FFAMP
4.3: DFF3D to TZT3
4.4: DFF3-UHD to TZT3
Section 5: FCV1900 Key Pulse Supplement
Key Pulse CH500/600 to FCV1900

Section 1: KP Kit Wiring and Installation
1.1 DI-FFAMP/DFF3D KP CONNECTION
PN: 001-205-780-00 Includes:
•1 ea KP Cable Machine Screws
•1ea Gland Wire Crimp Butt connectors
•EMI Filter
•Cable Clamp
•
2. Example Connection

1.2:DI-FFAMP/DFF3-UHD KP CONNECTION
PN: 001-205-780-00 Includes:
•1 ea KP Cable Machine Screws
•1ea Gland Wire Crimp Butt connectors
•EMI Filter
•Cable Clamp

1.3: DFF3D/TZT3 KP CONNECTION
001-605-510-00 Kit consists of the following:
•1 ea. KP Cable
•1 ea. Gland
•Screws
•Cable Clamp

Installing TZT3 DFF3D KP CONNECTION KIT
1. Remove the plastic cover and unfasten 4 phillips screws to remove metal shield cover.
2. Detach the protective sheet from the location for the external KP.
3. Do the following:
1) Unfasten the sealing nut and lock nut from the supplied cable gland. As shown below,
pass the cable through the sealing nut, cable gland, hole in the network fish finder and
the lock nut.

2) Tighten the Lock nut on the back of the cable gland.
3) Position the cable so the vinyl sheath lies in the cable clamp, then use the supplied cable
clamp and set screw to secure the cable ensuring that the ground wire contacts
the chassis then tighten down the screw. Then tighten the sealing nut of the cable
gland.
4) Pass the cable through cable holder then connect the cable to J12 on the PWRTX board.

5) Attach the supplied EMI core to KP cable, approx. 10mm from the super gland.
6) Attach the shield cover and replace the plastic cover.
7) Connect DFF3D KP Cable to the TZT12F,16F, 19F pigtail cable labled “DI-FFAMP”. Align the
keyways, twist the locking collar of the DFF3D KP cable connector until it is locked
in place. If the connection is in a wet environment, seal up the conenction with electrical
tape and then wrap it in vulcanizing tape.
DI-FFAMP CONN Keyway
DFF3D KP CONN Keyway

1.4:DFF3-UHD/TZT3 KP CONNECTION
The 001-605-510-00 Kit consists of the following:
•1ea. 000-163-191 (Screw/Washer HD M4X10)
•1ea. 000-177-248-10 (XDCR Gland)
•1ea. SG3-000-001-99 (5M Key Pulse Cable)
•1ea. Metal Fixing Plate
(NOTE: Gland, screws and fixing plate not used in this application)

Installing TZT3 DFF3-UHD KP CONNECTION KIT
4.Remove the plastic cover and unfasten 4 phillips screws to remove metal shield cover.
5. Remove the KP cable gland sealing cover and blanking plug.

6. Do the following:
7. Pass the cable through the sealing nut, cable gland, hole in the network fish finder and
the lock nut.
8. Tighten the Lock nut on the back of the cable gland.
9. Connect the Green Grounding Wire to the nearest screw on the metal cable clamp,
ensuring that the ground wire contacts the chassis.

10. Remove the 4-pin XH connector housing, strip and connect the KP cable wires (Red and
Black) to Connector TB1 using pins #1 and #2 as shown below.

11. Attach the shield cover and replace the plastic cover.

Connecting DFF3-UHD KP Cable Kit to TZT3 MFD
(TZT12F,16F and 19F)
1. Connect DFF3-UHD KP Cable to the TZT12F,16F, 19F pigtail cable labled “DI-FFAMP”. Align
the keyways, twist the locking collar of the DFF3-UHD KP cable connector until it is locked
in place. If the connection is in a wet environment, seal up the conenction with electrical tape
and then wrap it in vulcanizing tape.
DI-FFAMP CONN Keyway
DFF3-UHD KP CONN

Section 2: TZT3 MFD settings (TZT12F,16F,19F)
2.1: Settings for DI-FFAMP
The following settings must be made on TZtouch3 MFD physically connected to the DI-FFAMP.
1. Select [Settings]
2. Select [Fish Finder]

3. Set [Fish Finder Source] to TZtouch3 MFD that is physically connected to DI-FFAMP.
4. Set [External KP] to ON
*Note: Set External KP setting to ON only for the internal/DI fish finder under fish finder menu. DO NOT
set External KP to ON within the Multi-Beam Sonar menu. Not following this will cause the multi-beam
to stop transmitting.

2.2: Settings for the DFF3D and DFF3-UHD
1. Select HOME then SETTINGS
2. Select INITIAL SETUP, then Fish Finder

3. In Fish Finder, make sure that the correct sounder source is set to “DFF3-UHD”
4. Scroll down in the Fish Finder menu to EXTERNAL KP and set to ON

Section 3: Notes, Considerations and Examples
3.1: Notes and Considerations.
Slowdown of Sounder: You must keep in mind that utilizing the External KP function will
slow down the Transmission Rate of the Internal Sounder as well as the DFF3D or DFF3-UHD.
This will not impede function and is a normal condition. This occurs because the transmission
pluses of both the TZtouch3 MFD/DI-FFAMP and the DFF3D/DFF3-UHD will be staggered so
that they do not affect each other.
Primary and Secondary Modes:In most applications, the DFF3D or DFF3-UHD will function
as the primary sounder. In some applications however, the internal sounder may be used as
well. In this scenario, when you turn on the KP Sync button, that unit is now listening for the
KP Sync signal (Secondary mode) to function. This means the DFF3-UHD is now Listening only
for the KP Signal, not Sending one. Please ensure ONLY ONE of the Fish Finders has this
selection turned ON, if both Fish Finders have KP Sync turned ON, neither Fish Finder will be
transmitting as both would be listening for a signal.
Heaving and Pitch/Roll Compensation Considerations: With both the TZtouch3 MFD/DI-
FFAMP and the DFF3D/DFF3-UHD we can employ Heaving Correction (“Heave” or “HVE”) to
correct for excessive Heaving in rougher seas. This is done using the input from a Satellite
compass (Recommended installation) or, in the case of the DFF3D only, the built in motion
sensor in its transducer (for pitch/roll). In a larger system utilizing both the TZtouch3 MFD or
DI-FFAMP and the DFF3D or DFF3-UHD, the KP settings must be done correctly to make sure
correct HVE correction across all sounders. If one inputs the “HVE” sentence from the Satellite
Compass to the DFF3D, it will compensate regardless of KP Setting. To make this work
correctly, you must set it as follows:
DFF3D/DFF3-UHD: KP – “ON”
DI-FFAMP: KP – “OFF”
This puts the DFF3D or DFF3-UHD is Secondary mode and the DI-FFAMP in Primary Mode.
Further Information on Heaving Correction.