Airmar P48W User Manual download pdf (Page 5)

Figure 10. P48W transom mount: Adjusting the beam angle

To adjust knob:

push, turn, and

release

NOTE: Knob

corresponds to

shape and direction

of beam.

cover

screw (2)

knob

beam angle

transducer

(6 x 1/2")(6 x 1/2")

(0° shown)

Locating & Installing the Fitting

CAUTION: Do not put tension to the cable where it exits the

transducer, since excessive force can break internal connections.

CAUTION: On bow mounted motors, be sure the cable route does

not result in pinching the cable when the motor is in the “up” position.

NOTE: P48W—It may be easier to adjust the beam angle before

the transducer is mounted on the trolling motor. See “Operating:

P48W” on page 5.

1. Purchase a stainless steel band clamp, available in the plumbing

section of most hardware stores. Be sure to measure the

circumference of the trolling motor to determine the correct size.

2. Loosen the screw in the band clamp so that one end of the

band is free. Pass the free end through the two slots in the

trolling fitting (see Figure 8).

3. Wrap the band clamp around the motor case with the sensor

located on the underside (see Figure 9). Tighten the screw on

the band clamp.

TM150M—Be sure the cable exits through the notch in the

trolling motor fitting, and there is no tension on the cable.

NOTE: If the motor has a strut that shades the transducer, it will

not significantly reduce the transducer’s performance.

4. Route the cable around the side of the motor case and along the

support tube. Secure the cable to the support tube with cable ties.

P48W—Allow sufficient cable so the user can change the beam

angle of the transducer.

5. Route the cable to the echosounder being careful not to tear the

cable jacket. To reduce electrical interference, separate the

transducer cable from other electrical wiring.

In-Hull Mount: P48W Only

NOTE: Do not in-hull mount the TM models as they will over-heat.

Although the performance will be diminished, the transducer can

be adhered directly to a solid fiberglass hull—NO coring.

Instructions are available at airmar.com. Go to Marine Products

>Installation Instructions>In-Hull Transducers and click on “P72,

P74, P76” (part number 17-010).

Operating: P48W

About Adjusting the Beam Angle

The transducer transmits an elliptically shaped beam that can be

adjusted to different angles: fore-aft (0°), port-starboard (90°), 23°,

or 45°. The degree setting indicates the widest part of the beam.

Note that the width of the beam will be different at each setting.

To understand when to use each beam setting see the table below.

Adjusting: Transom Mount

To change the beam angle, grasp the transducer knob, push down,

rotate to the desired setting, and release the knob (see Figure 10).

Check that the transducer is locked into the setting by running your

hand along the bottom of the transducer to be sure it is flush with

the fitting.

NOTE: Knob corresponds to the direction and shape of the beam.

Adjusting: Trolling Motor or Portable Mount

The beam angles are marked on the underside of the trolling

motor fitting (see Figure 11). To change the beam angle, grasp

the transducer and pull outward. Rotate it until the orientation

mark is aligned with the desired setting and release the

transducer. Be sure the transducer is locked into the setting after

the knob is released.

NOTE: When an angle is set, the orientation mark will indicate the

direction of the widest part of the beam. It will also be aligned with

the elliptically shaped knob on the top.

Setting

Fore-Aft

Beam Width

Port-Starboard

Beam Width

Application

0° 38° 12°

Best high-speed bottom detection

Fish appear as large arches

23° 36° 18°

Good high-speed detection

Fish appear as prominent arches

Wider side-to-side beam than at 0

45° 29° 29°

Detection similar to conventional

wide-beam transducer

Equal size beam width in both

directions

90° 12° 38°

Maximum detection while boat is

moving forward

Good high-speed bottom detection

Fish arches are not pronounced or

may not be evident

Figure 11. P48W trolling motor mount: Adjusting beam angle

top view bottom view

knob corresponds

beam

orientation

mark

(90° shown)

to shape and

direction of beam

transducer

angle

1 2 3 4 5 6

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Airmar P48W User Manual Page 5

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