Airmar External Diplexer User Manual

INSTALLATION INSTRUCTIONS

External Diplexer

Converts dual transmission-line transducer to single line

WARNING: Always wear safety goggles and a dust
mask when installing to avoid personal injury.

CAUTION: To reduce electrical interference from

17-538-01 rev. 02 12/14/10

other electrical wiring and any on-board equipment with
strong magnetic fields such as radar equipment, radio
transmitters, boat engines, generators, etc., separate
the cables by at least 1m (3').

CAUTION: Be careful not to tear the cable jackets
when passing them through bulkheads and other
parts of the boat. Use grommets to prevent chaffing.
Use deck glands to prevent water seepage into the
boat.

IMPORTANT: Please read the instructions completely
before proceeding with the installation. These
instructions supersede any other instructions in your
instrument manual if they differ.

Tools & Materials

Safety goggles
Dust mask
Pencil
Electric drill
Drill bit 3mm or 1/8"
Grommets (some installations)
Deck gland (some installations)
Phillips screwdrivers
Heat-shrink tubing
Slip-joint pliers
Petroleum jelly (such as Vaseline® brand)
Cable ties

Where to Purchase Parts

Gemeco (USA) Tel: [phone]

Fax: [phone]
email: [e-mail]

Airmar EMEA Tel: [phone]
(Europe, Middle East, Africa) Fax: [phone]

email: [e-mail]

R

A

M

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Applications

• Converts a dual transmission-line transducer to a single
transmission-line.

• For use with 1 kW echosounders only

Installation

Mounting Location & Hole Drilling

1. Select a convenient, dry, mounting location for the water-

resistant Diplexer, a minimum of 1m (3') from other cables and
electronic equipment.

2. Hold the Diplexer at the selected location and mark the position

of the four screw holes.

NOTE: If the Diplexer will be mounted on a vertical surface,
face the compression nut downward to avoid any possibility of
water seeping into the box.

3. At the marked locations, drill 3mm or 1/8" holes to a depth of

10mm (3/8"). Do not fasten the Diplexer in place at this time.

Cable Routing

1. Route the transducer cable from the transducer to the Diplexer.

Do not connect the transducer cable or fasten it in place at this
time.

2. Route the fishfinder cable from the fishfinder to the Diplexer’s

cable. Do not connect the cables or fasten them in place at this

time.

Connecting

CAUTION: When the connections are complete, be sure there are
no frayed strands, or loose or bare ends to cause shorting.

1. Remove the cover of the Diplexer. Set it aside along with the two
screws and the plastic bag containing the four mounting screws.

2. Push approximately 200mm (8") of the transducer cable
through the compression nut (see Figure 1). To ease sliding,
bend the wires back against the cable jacket or wrap electrical
tape around them.

3. C44-01 Cable Only—Select the bundle wrapped in green foil,
containing brown, white, and bare wires. Cut off the bare wire
and the foil flush with the cable jacket.

4. Protect the cable’s foil shielding from causing a short circuit
inside the Diplexer. Use heat-shrink tubing around the jacket
where the wires emerge from the cable. The tubing must
overlap the wires a minimum of 6mm (1/4").

5. Twist the bare wires together.
C44-01 has 3 bare wires. (A fourth bare wire was cut off.)
C335 has 2 bare wires.

6. Following the label on the Diplexer cover and the list below,
insert the stripped end of each colored wire /twisted bare wires
into the appropriate opening in the side of the terminal block.
Tighten the terminal screw until the wire(s) is held firmly.

1. Brown Temperature

2. Yellow (C44-01 cable) + Low frequency
Blue with white stripe (C335 cable)

3. Black with white stripe - Low frequency

4. Bare wires Ground
(C44-01 has 3 bare wires. The fourth bare was cut off.)
(C335 has 2 bare wires)

5. Orange Transducer ID®

6. Black - High frequency

7. Blue + High frequency

8. White Temperature

7. Visually inspect all the wires. There should be no frayed strands
or loose ends to cause shorting. If any colored wire has a visible
bare end, reconnect it to the terminal.

Completing the Installation

1. From outside the Diplexer, pull the transducer cable until only
51mm (2") of jacket remains inside the box. Using slip-joint
pliers, tighten the compression nut to make a watertight seal.

2. Arrange the wires neatly inside the Diplexer. Check to be sure
the gasket is firmly installed in the channel on the back side of
the cover (see Figure 2). Lubricate the gasket with petroleum
jelly. Screw the cover in place with the two long screws
supplied.

3. Fasten the Diplexer in place at the mounting location with the
four 6 x 1/2" screws supplied.

4. Plug the connector on the fishfinder cable into the Diplexer
cable connector.

5. Fasten all the cables in place. Coil any excess cable and
secure it with cable ties to prevent damage.

(enlarged to show detail)

heat-shrink
tubing

Diplexer cable
connects to fishfinder

transducer
cable

compression
nut

Figure 1. Connecting

Copyright © 2009 Airmar Technology Corp.

NOTE: lubricate
gasket with
petroleum jelly

Figure 2. Lubricate the gasket

Copyright © 2009 Airmar Technology Cor p.

Transducer ID® is a trademark of Airmar Technology Corporation.

®

AIRMAR

TECHNOLOGY CORPORATION

2

35 Meadowbrook Drive, Milford, New Hampshire 03055-4613, USA

www.airmar.com

Copyright © 2009 - 2010 Airmar Technology Corp. All rights reserved.